---
_id: '36327'
abstract:
- lang: eng
text: "AbstractWith an innovative optical characterization
method, using high-temperature digital image correlation in combination with thermal
imaging, the local change in strain and change in temperature could be determined
during thermo-mechanical treatment of flat steel specimens. With data obtained
by this optical method, the transformation kinetics for every area of interest
along the whole measuring length of a flat specimen could be analyzed by the generation
of dilatation curves. The benefit of this innovative optical characterization
method compared to a dilatometer test is that the experimental effort for the
design of a tailored component could be strongly reduced to the investigation
of only a few tailored thermo-mechanical processed specimens. Due to the implementation
of a strain and/or temperature gradient within the flat specimen, less metallographic
samples are prepared for hardness analysis and analysis of the microstructural
composition by scanning electron microscopy to investigate the influence of different
process parameters. Compared to performed dilatometer tests in this study, the
optical method obtained comparable results for the transformation start and end
temperatures. For the final design of a part with tailored properties, the optical
method is suitable for a time-efficient material characterization.\r\n
\ Graphical Abstract"
author:
- first_name: Alexander
full_name: Reitz, Alexander
id: '24803'
last_name: Reitz
orcid: 0000-0001-9047-467X
- first_name: Olexandr
full_name: Grydin, Olexandr
id: '43822'
last_name: Grydin
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: 'Reitz A, Grydin O, Schaper M. Optical Detection of Phase Transformations in
Steels: An Innovative Method for Time-Efficient Material Characterization During
Tailored Thermo-mechanical Processing of a Press Hardening Steel. Metallurgical
and Materials Transactions A. 2022;53(8):3125-3142. doi:10.1007/s11661-022-06732-z'
apa: 'Reitz, A., Grydin, O., & Schaper, M. (2022). Optical Detection of Phase
Transformations in Steels: An Innovative Method for Time-Efficient Material Characterization
During Tailored Thermo-mechanical Processing of a Press Hardening Steel. Metallurgical
and Materials Transactions A, 53(8), 3125–3142. https://doi.org/10.1007/s11661-022-06732-z'
bibtex: '@article{Reitz_Grydin_Schaper_2022, title={Optical Detection of Phase Transformations
in Steels: An Innovative Method for Time-Efficient Material Characterization During
Tailored Thermo-mechanical Processing of a Press Hardening Steel}, volume={53},
DOI={10.1007/s11661-022-06732-z},
number={8}, journal={Metallurgical and Materials Transactions A}, publisher={Springer
Science and Business Media LLC}, author={Reitz, Alexander and Grydin, Olexandr
and Schaper, Mirko}, year={2022}, pages={3125–3142} }'
chicago: 'Reitz, Alexander, Olexandr Grydin, and Mirko Schaper. “Optical Detection
of Phase Transformations in Steels: An Innovative Method for Time-Efficient Material
Characterization During Tailored Thermo-Mechanical Processing of a Press Hardening
Steel.” Metallurgical and Materials Transactions A 53, no. 8 (2022): 3125–42.
https://doi.org/10.1007/s11661-022-06732-z.'
ieee: 'A. Reitz, O. Grydin, and M. Schaper, “Optical Detection of Phase Transformations
in Steels: An Innovative Method for Time-Efficient Material Characterization During
Tailored Thermo-mechanical Processing of a Press Hardening Steel,” Metallurgical
and Materials Transactions A, vol. 53, no. 8, pp. 3125–3142, 2022, doi: 10.1007/s11661-022-06732-z.'
mla: 'Reitz, Alexander, et al. “Optical Detection of Phase Transformations in Steels:
An Innovative Method for Time-Efficient Material Characterization During Tailored
Thermo-Mechanical Processing of a Press Hardening Steel.” Metallurgical and
Materials Transactions A, vol. 53, no. 8, Springer Science and Business Media
LLC, 2022, pp. 3125–42, doi:10.1007/s11661-022-06732-z.'
short: A. Reitz, O. Grydin, M. Schaper, Metallurgical and Materials Transactions
A 53 (2022) 3125–3142.
date_created: 2023-01-12T09:30:12Z
date_updated: 2023-04-27T16:39:55Z
department:
- _id: '158'
- _id: '321'
doi: 10.1007/s11661-022-06732-z
intvolume: ' 53'
issue: '8'
keyword:
- Metals and Alloys
- Mechanics of Materials
- Condensed Matter Physics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://link.springer.com/article/10.1007/s11661-022-06732-z
oa: '1'
page: 3125-3142
publication: Metallurgical and Materials Transactions A
publication_identifier:
issn:
- 1073-5623
- 1543-1940
publication_status: published
publisher: Springer Science and Business Media LLC
quality_controlled: '1'
status: public
title: 'Optical Detection of Phase Transformations in Steels: An Innovative Method
for Time-Efficient Material Characterization During Tailored Thermo-mechanical Processing
of a Press Hardening Steel'
type: journal_article
user_id: '43720'
volume: 53
year: '2022'
...
---
_id: '29196'
abstract:
- lang: eng
text: In biomedical engineering, laser powder bed fusion is an advanced manufacturing
technology, which enables, for example, the production of patient-customized implants
with complex geometries. Ti-6Al-7Nb shows promising improvements, especially regarding
biocompatibility, compared with other titanium alloys. The biocompatible features
are investigated employing cytocompatibility and antibacterial examinations on
Al2O3-blasted and untreated surfaces. The mechanical properties of additively
manufactured Ti-6Al-7Nb are evaluated in as-built and heat-treated conditions.
Recrystallization annealing (925 °C for 4 h), β annealing (1050 °C for 2 h), as
well as stress relieving (600 °C for 4 h) are applied. For microstructural investigation,
scanning and transmission electron microscopy are performed. The different microstructures
and the mechanical properties are compared. Mechanical behavior is determined
based on quasi-static tensile tests and strain-controlled low cycle fatigue tests
with total strain amplitudes εA of 0.35%, 0.5%, and 0.8%. The as-built and stress-relieved
conditions meet the mechanical demands for the tensile properties of the international
standard ISO 5832-11. Based on the Coffin–Manson–Basquin relation, fatigue strength
and ductility coefficients, as well as exponents, are determined to examine fatigue
life for the different conditions. The stress-relieved condition exhibits, overall,
the best properties regarding monotonic tensile and cyclic fatigue behavior.
article_number: '122'
article_type: original
author:
- first_name: Maxwell
full_name: Hein, Maxwell
id: '52771'
last_name: Hein
orcid: 0000-0002-3732-2236
- first_name: David
full_name: Kokalj, David
last_name: Kokalj
- first_name: Nelson Filipe
full_name: Lopes Dias, Nelson Filipe
last_name: Lopes Dias
- first_name: Dominic
full_name: Stangier, Dominic
last_name: Stangier
- first_name: Hilke
full_name: Oltmanns, Hilke
last_name: Oltmanns
- first_name: Sudipta
full_name: Pramanik, Sudipta
last_name: Pramanik
- first_name: Manfred
full_name: Kietzmann, Manfred
last_name: Kietzmann
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
id: '48411'
last_name: Hoyer
- first_name: Jessica
full_name: Meißner, Jessica
last_name: Meißner
- first_name: Wolfgang
full_name: Tillmann, Wolfgang
last_name: Tillmann
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: Hein M, Kokalj D, Lopes Dias NF, et al. Low Cycle Fatigue Performance of Additively
Processed and Heat-Treated Ti-6Al-7Nb Alloy for Biomedical Applications. Metals.
2022;12(1). doi:10.3390/met12010122
apa: Hein, M., Kokalj, D., Lopes Dias, N. F., Stangier, D., Oltmanns, H., Pramanik,
S., Kietzmann, M., Hoyer, K.-P., Meißner, J., Tillmann, W., & Schaper, M.
(2022). Low Cycle Fatigue Performance of Additively Processed and Heat-Treated
Ti-6Al-7Nb Alloy for Biomedical Applications. Metals, 12(1), Article
122. https://doi.org/10.3390/met12010122
bibtex: '@article{Hein_Kokalj_Lopes Dias_Stangier_Oltmanns_Pramanik_Kietzmann_Hoyer_Meißner_Tillmann_et
al._2022, title={Low Cycle Fatigue Performance of Additively Processed and Heat-Treated
Ti-6Al-7Nb Alloy for Biomedical Applications}, volume={12}, DOI={10.3390/met12010122},
number={1122}, journal={Metals}, publisher={MDPI AG}, author={Hein, Maxwell and
Kokalj, David and Lopes Dias, Nelson Filipe and Stangier, Dominic and Oltmanns,
Hilke and Pramanik, Sudipta and Kietzmann, Manfred and Hoyer, Kay-Peter and Meißner,
Jessica and Tillmann, Wolfgang and et al.}, year={2022} }'
chicago: Hein, Maxwell, David Kokalj, Nelson Filipe Lopes Dias, Dominic Stangier,
Hilke Oltmanns, Sudipta Pramanik, Manfred Kietzmann, et al. “Low Cycle Fatigue
Performance of Additively Processed and Heat-Treated Ti-6Al-7Nb Alloy for Biomedical
Applications.” Metals 12, no. 1 (2022). https://doi.org/10.3390/met12010122.
ieee: 'M. Hein et al., “Low Cycle Fatigue Performance of Additively Processed
and Heat-Treated Ti-6Al-7Nb Alloy for Biomedical Applications,” Metals,
vol. 12, no. 1, Art. no. 122, 2022, doi: 10.3390/met12010122.'
mla: Hein, Maxwell, et al. “Low Cycle Fatigue Performance of Additively Processed
and Heat-Treated Ti-6Al-7Nb Alloy for Biomedical Applications.” Metals,
vol. 12, no. 1, 122, MDPI AG, 2022, doi:10.3390/met12010122.
short: M. Hein, D. Kokalj, N.F. Lopes Dias, D. Stangier, H. Oltmanns, S. Pramanik,
M. Kietzmann, K.-P. Hoyer, J. Meißner, W. Tillmann, M. Schaper, Metals 12 (2022).
date_created: 2022-01-10T08:25:58Z
date_updated: 2023-04-27T16:42:19Z
ddc:
- '620'
department:
- _id: '158'
doi: 10.3390/met12010122
file:
- access_level: closed
content_type: application/pdf
creator: maxhein
date_created: 2022-01-10T08:27:11Z
date_updated: 2022-01-10T08:27:11Z
file_id: '29197'
file_name: Hein et al - 2022 - Low Cycle Fatigue Performance of Additively Processed
and Heat-Treated Ti-6Al-7Nb Alloy for Biomedical Applications.pdf
file_size: 6222748
relation: main_file
success: 1
file_date_updated: 2022-01-10T08:27:11Z
has_accepted_license: '1'
intvolume: ' 12'
issue: '1'
keyword:
- General Materials Science
- Metals and Alloys
- laser powder bed fusion
- Ti-6Al-7Nb
- titanium alloy
- biomedical engineering
- low cycle fatigue
- microstructure
- nanostructure
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.mdpi.com/2075-4701/12/1/122
oa: '1'
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Low Cycle Fatigue Performance of Additively Processed and Heat-Treated Ti-6Al-7Nb
Alloy for Biomedical Applications
type: journal_article
user_id: '43720'
volume: 12
year: '2022'
...
---
_id: '34652'
article_number: '128835'
author:
- first_name: P.
full_name: Vieth, P.
last_name: Vieth
- first_name: M.-A.
full_name: Garthe, M.-A.
last_name: Garthe
- first_name: Dietrich
full_name: Voswinkel, Dietrich
id: '52634'
last_name: Voswinkel
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
- first_name: Guido
full_name: Grundmeier, Guido
id: '194'
last_name: Grundmeier
citation:
ama: Vieth P, Garthe M-A, Voswinkel D, Schaper M, Grundmeier G. Enhancement of the
delamination resistance of adhesive film coated surface laser melted aluminum
7075-T6 alloy by aminophosphonic acid adsorption. Surface and Coatings Technology.
2022;447. doi:10.1016/j.surfcoat.2022.128835
apa: Vieth, P., Garthe, M.-A., Voswinkel, D., Schaper, M., & Grundmeier, G.
(2022). Enhancement of the delamination resistance of adhesive film coated surface
laser melted aluminum 7075-T6 alloy by aminophosphonic acid adsorption. Surface
and Coatings Technology, 447, Article 128835. https://doi.org/10.1016/j.surfcoat.2022.128835
bibtex: '@article{Vieth_Garthe_Voswinkel_Schaper_Grundmeier_2022, title={Enhancement
of the delamination resistance of adhesive film coated surface laser melted aluminum
7075-T6 alloy by aminophosphonic acid adsorption}, volume={447}, DOI={10.1016/j.surfcoat.2022.128835},
number={128835}, journal={Surface and Coatings Technology}, publisher={Elsevier
BV}, author={Vieth, P. and Garthe, M.-A. and Voswinkel, Dietrich and Schaper,
Mirko and Grundmeier, Guido}, year={2022} }'
chicago: Vieth, P., M.-A. Garthe, Dietrich Voswinkel, Mirko Schaper, and Guido Grundmeier.
“Enhancement of the Delamination Resistance of Adhesive Film Coated Surface Laser
Melted Aluminum 7075-T6 Alloy by Aminophosphonic Acid Adsorption.” Surface
and Coatings Technology 447 (2022). https://doi.org/10.1016/j.surfcoat.2022.128835.
ieee: 'P. Vieth, M.-A. Garthe, D. Voswinkel, M. Schaper, and G. Grundmeier, “Enhancement
of the delamination resistance of adhesive film coated surface laser melted aluminum
7075-T6 alloy by aminophosphonic acid adsorption,” Surface and Coatings Technology,
vol. 447, Art. no. 128835, 2022, doi: 10.1016/j.surfcoat.2022.128835.'
mla: Vieth, P., et al. “Enhancement of the Delamination Resistance of Adhesive Film
Coated Surface Laser Melted Aluminum 7075-T6 Alloy by Aminophosphonic Acid Adsorption.”
Surface and Coatings Technology, vol. 447, 128835, Elsevier BV, 2022, doi:10.1016/j.surfcoat.2022.128835.
short: P. Vieth, M.-A. Garthe, D. Voswinkel, M. Schaper, G. Grundmeier, Surface
and Coatings Technology 447 (2022).
date_created: 2022-12-21T09:35:17Z
date_updated: 2023-04-27T16:40:55Z
department:
- _id: '302'
doi: 10.1016/j.surfcoat.2022.128835
intvolume: ' 447'
keyword:
- Materials Chemistry
- Surfaces
- Coatings and Films
- Surfaces and Interfaces
- Condensed Matter Physics
- General Chemistry
language:
- iso: eng
publication: Surface and Coatings Technology
publication_identifier:
issn:
- 0257-8972
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Enhancement of the delamination resistance of adhesive film coated surface
laser melted aluminum 7075-T6 alloy by aminophosphonic acid adsorption
type: journal_article
user_id: '43720'
volume: 447
year: '2022'
...
---
_id: '41496'
article_number: '107235'
author:
- first_name: Maxwell
full_name: Hein, Maxwell
id: '52771'
last_name: Hein
orcid: 0000-0002-3732-2236
- first_name: Nelson Filipe
full_name: Lopes Dias, Nelson Filipe
last_name: Lopes Dias
- first_name: David
full_name: Kokalj, David
last_name: Kokalj
- first_name: Dominic
full_name: Stangier, Dominic
last_name: Stangier
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
id: '48411'
last_name: Hoyer
- first_name: Wolfgang
full_name: Tillmann, Wolfgang
last_name: Tillmann
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: Hein M, Lopes Dias NF, Kokalj D, et al. On the influence of physical vapor
deposited thin coatings on the low-cycle fatigue behavior of additively processed
Ti-6Al-7Nb alloy. International Journal of Fatigue. 2022;166. doi:10.1016/j.ijfatigue.2022.107235
apa: Hein, M., Lopes Dias, N. F., Kokalj, D., Stangier, D., Hoyer, K.-P., Tillmann,
W., & Schaper, M. (2022). On the influence of physical vapor deposited thin
coatings on the low-cycle fatigue behavior of additively processed Ti-6Al-7Nb
alloy. International Journal of Fatigue, 166, Article 107235. https://doi.org/10.1016/j.ijfatigue.2022.107235
bibtex: '@article{Hein_Lopes Dias_Kokalj_Stangier_Hoyer_Tillmann_Schaper_2022, title={On
the influence of physical vapor deposited thin coatings on the low-cycle fatigue
behavior of additively processed Ti-6Al-7Nb alloy}, volume={166}, DOI={10.1016/j.ijfatigue.2022.107235},
number={107235}, journal={International Journal of Fatigue}, publisher={Elsevier
BV}, author={Hein, Maxwell and Lopes Dias, Nelson Filipe and Kokalj, David and
Stangier, Dominic and Hoyer, Kay-Peter and Tillmann, Wolfgang and Schaper, Mirko},
year={2022} }'
chicago: Hein, Maxwell, Nelson Filipe Lopes Dias, David Kokalj, Dominic Stangier,
Kay-Peter Hoyer, Wolfgang Tillmann, and Mirko Schaper. “On the Influence of Physical
Vapor Deposited Thin Coatings on the Low-Cycle Fatigue Behavior of Additively
Processed Ti-6Al-7Nb Alloy.” International Journal of Fatigue 166 (2022).
https://doi.org/10.1016/j.ijfatigue.2022.107235.
ieee: 'M. Hein et al., “On the influence of physical vapor deposited thin
coatings on the low-cycle fatigue behavior of additively processed Ti-6Al-7Nb
alloy,” International Journal of Fatigue, vol. 166, Art. no. 107235, 2022,
doi: 10.1016/j.ijfatigue.2022.107235.'
mla: Hein, Maxwell, et al. “On the Influence of Physical Vapor Deposited Thin Coatings
on the Low-Cycle Fatigue Behavior of Additively Processed Ti-6Al-7Nb Alloy.” International
Journal of Fatigue, vol. 166, 107235, Elsevier BV, 2022, doi:10.1016/j.ijfatigue.2022.107235.
short: M. Hein, N.F. Lopes Dias, D. Kokalj, D. Stangier, K.-P. Hoyer, W. Tillmann,
M. Schaper, International Journal of Fatigue 166 (2022).
date_created: 2023-02-02T14:27:17Z
date_updated: 2023-04-27T16:45:58Z
department:
- _id: '9'
- _id: '158'
doi: 10.1016/j.ijfatigue.2022.107235
intvolume: ' 166'
keyword:
- Industrial and Manufacturing Engineering
- Mechanical Engineering
- Mechanics of Materials
- General Materials Science
- Modeling and Simulation
language:
- iso: eng
publication: International Journal of Fatigue
publication_identifier:
issn:
- 0142-1123
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: On the influence of physical vapor deposited thin coatings on the low-cycle
fatigue behavior of additively processed Ti-6Al-7Nb alloy
type: journal_article
user_id: '43720'
volume: 166
year: '2022'
...
---
_id: '32332'
author:
- first_name: Jan Tobias
full_name: Krüger, Jan Tobias
id: '44307'
last_name: Krüger
orcid: 0000-0002-0827-9654
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
id: '48411'
last_name: Hoyer
- first_name: Florian
full_name: Hengsbach, Florian
last_name: Hengsbach
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: Krüger JT, Hoyer K-P, Hengsbach F, Schaper M. Formation of insoluble silver-phases
in an iron-manganese matrix for bioresorbable implants using varying laser beam
melting strategies. Journal of Materials Research and Technology. 2022;19:2369-2387.
doi:10.1016/j.jmrt.2022.06.006
apa: Krüger, J. T., Hoyer, K.-P., Hengsbach, F., & Schaper, M. (2022). Formation
of insoluble silver-phases in an iron-manganese matrix for bioresorbable implants
using varying laser beam melting strategies. Journal of Materials Research
and Technology, 19, 2369–2387. https://doi.org/10.1016/j.jmrt.2022.06.006
bibtex: '@article{Krüger_Hoyer_Hengsbach_Schaper_2022, title={Formation of insoluble
silver-phases in an iron-manganese matrix for bioresorbable implants using varying
laser beam melting strategies}, volume={19}, DOI={10.1016/j.jmrt.2022.06.006},
journal={Journal of Materials Research and Technology}, publisher={Elsevier BV},
author={Krüger, Jan Tobias and Hoyer, Kay-Peter and Hengsbach, Florian and Schaper,
Mirko}, year={2022}, pages={2369–2387} }'
chicago: 'Krüger, Jan Tobias, Kay-Peter Hoyer, Florian Hengsbach, and Mirko Schaper.
“Formation of Insoluble Silver-Phases in an Iron-Manganese Matrix for Bioresorbable
Implants Using Varying Laser Beam Melting Strategies.” Journal of Materials
Research and Technology 19 (2022): 2369–87. https://doi.org/10.1016/j.jmrt.2022.06.006.'
ieee: 'J. T. Krüger, K.-P. Hoyer, F. Hengsbach, and M. Schaper, “Formation of insoluble
silver-phases in an iron-manganese matrix for bioresorbable implants using varying
laser beam melting strategies,” Journal of Materials Research and Technology,
vol. 19, pp. 2369–2387, 2022, doi: 10.1016/j.jmrt.2022.06.006.'
mla: Krüger, Jan Tobias, et al. “Formation of Insoluble Silver-Phases in an Iron-Manganese
Matrix for Bioresorbable Implants Using Varying Laser Beam Melting Strategies.”
Journal of Materials Research and Technology, vol. 19, Elsevier BV, 2022,
pp. 2369–87, doi:10.1016/j.jmrt.2022.06.006.
short: J.T. Krüger, K.-P. Hoyer, F. Hengsbach, M. Schaper, Journal of Materials
Research and Technology 19 (2022) 2369–2387.
date_created: 2022-07-07T13:55:10Z
date_updated: 2023-04-27T16:45:17Z
department:
- _id: '9'
- _id: '158'
doi: 10.1016/j.jmrt.2022.06.006
intvolume: ' 19'
keyword:
- Metals and Alloys
- Surfaces
- Coatings and Films
- Biomaterials
- Ceramics and Composites
language:
- iso: eng
page: 2369-2387
publication: Journal of Materials Research and Technology
publication_identifier:
issn:
- 2238-7854
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Formation of insoluble silver-phases in an iron-manganese matrix for bioresorbable
implants using varying laser beam melting strategies
type: journal_article
user_id: '43720'
volume: 19
year: '2022'
...
---
_id: '41498'
author:
- first_name: Jan Tobias
full_name: Krüger, Jan Tobias
id: '44307'
last_name: Krüger
orcid: 0000-0002-0827-9654
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
id: '48411'
last_name: Hoyer
- first_name: Florian
full_name: Hengsbach, Florian
last_name: Hengsbach
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: Krüger JT, Hoyer K-P, Hengsbach F, Schaper M. Formation of insoluble silver-phases
in an iron-manganese matrix for bioresorbable implants using varying laser beam
melting strategies. Journal of Materials Research and Technology. 2022;19:2369-2387.
doi:10.1016/j.jmrt.2022.06.006
apa: Krüger, J. T., Hoyer, K.-P., Hengsbach, F., & Schaper, M. (2022). Formation
of insoluble silver-phases in an iron-manganese matrix for bioresorbable implants
using varying laser beam melting strategies. Journal of Materials Research
and Technology, 19, 2369–2387. https://doi.org/10.1016/j.jmrt.2022.06.006
bibtex: '@article{Krüger_Hoyer_Hengsbach_Schaper_2022, title={Formation of insoluble
silver-phases in an iron-manganese matrix for bioresorbable implants using varying
laser beam melting strategies}, volume={19}, DOI={10.1016/j.jmrt.2022.06.006},
journal={Journal of Materials Research and Technology}, publisher={Elsevier BV},
author={Krüger, Jan Tobias and Hoyer, Kay-Peter and Hengsbach, Florian and Schaper,
Mirko}, year={2022}, pages={2369–2387} }'
chicago: 'Krüger, Jan Tobias, Kay-Peter Hoyer, Florian Hengsbach, and Mirko Schaper.
“Formation of Insoluble Silver-Phases in an Iron-Manganese Matrix for Bioresorbable
Implants Using Varying Laser Beam Melting Strategies.” Journal of Materials
Research and Technology 19 (2022): 2369–87. https://doi.org/10.1016/j.jmrt.2022.06.006.'
ieee: 'J. T. Krüger, K.-P. Hoyer, F. Hengsbach, and M. Schaper, “Formation of insoluble
silver-phases in an iron-manganese matrix for bioresorbable implants using varying
laser beam melting strategies,” Journal of Materials Research and Technology,
vol. 19, pp. 2369–2387, 2022, doi: 10.1016/j.jmrt.2022.06.006.'
mla: Krüger, Jan Tobias, et al. “Formation of Insoluble Silver-Phases in an Iron-Manganese
Matrix for Bioresorbable Implants Using Varying Laser Beam Melting Strategies.”
Journal of Materials Research and Technology, vol. 19, Elsevier BV, 2022,
pp. 2369–87, doi:10.1016/j.jmrt.2022.06.006.
short: J.T. Krüger, K.-P. Hoyer, F. Hengsbach, M. Schaper, Journal of Materials
Research and Technology 19 (2022) 2369–2387.
date_created: 2023-02-02T14:28:03Z
date_updated: 2023-04-27T16:46:09Z
department:
- _id: '9'
- _id: '158'
doi: 10.1016/j.jmrt.2022.06.006
intvolume: ' 19'
keyword:
- Metals and Alloys
- Surfaces
- Coatings and Films
- Biomaterials
- Ceramics and Composites
language:
- iso: eng
page: 2369-2387
publication: Journal of Materials Research and Technology
publication_identifier:
issn:
- 2238-7854
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Formation of insoluble silver-phases in an iron-manganese matrix for bioresorbable
implants using varying laser beam melting strategies
type: journal_article
user_id: '43720'
volume: 19
year: '2022'
...
---
_id: '41503'
abstract:
- lang: eng
text: The quasi in-situ indentation behaviour of <110>||BD and <111>||BD-oriented
grains in a FeCo alloy is studied in this investigation. The effect of build height
on melt pool shape and melt pool size is also studied by finite element method
simulations. As the building height increases, the aspect ratio of the elliptical
melt pool increases. Correspondingly, the effect of the laser scan speed on the
melt pool shape and size is studied by the finite element method, because, as
the laser scan speed increases, the aspect ratio of the elliptical melt pool increases,
too. The microstructural characterisation of the indentation area before and after
indentation is performed by electron backscatter diffraction (EBSD). Based on
the EBSD data grain reference orientation deviation (GROD), calculations are performed
to describe the effect of indentations on the neighbouring grain orientations.
High GROD angles are detected in the neighbouring grain region adjoining the indented
grain. An in-depth slip trace analysis shows the activation of all three slip
systems ({110}<111>, {112}<111> and {123}<111>) which is also
confirmed by slip lines on the sample surface that are detected by laser scanning
confocal microscopy. A high concentration of geometrically necessary dislocations
(GNDs) are observed on the adjoining area to the indentation. Local surface topography
measurements by laser scanning confocal microscopy confirmed the formation of
pile-ups near the indentation.
author:
- first_name: Sudipta
full_name: Pramanik, Sudipta
last_name: Pramanik
- first_name: Frederik
full_name: Tasche, Frederik
last_name: Tasche
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
id: '48411'
last_name: Hoyer
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: 'Pramanik S, Tasche F, Hoyer K-P, Schaper M. Orientation-Dependent Indentation
Behaviour of Additively Manufactured FeCo Sample: A Quasi In-Situ Study. Magnetism.
2022;2(2):88-104. doi:10.3390/magnetism2020007'
apa: 'Pramanik, S., Tasche, F., Hoyer, K.-P., & Schaper, M. (2022). Orientation-Dependent
Indentation Behaviour of Additively Manufactured FeCo Sample: A Quasi In-Situ
Study. Magnetism, 2(2), 88–104. https://doi.org/10.3390/magnetism2020007'
bibtex: '@article{Pramanik_Tasche_Hoyer_Schaper_2022, title={Orientation-Dependent
Indentation Behaviour of Additively Manufactured FeCo Sample: A Quasi In-Situ
Study}, volume={2}, DOI={10.3390/magnetism2020007},
number={2}, journal={Magnetism}, publisher={MDPI AG}, author={Pramanik, Sudipta
and Tasche, Frederik and Hoyer, Kay-Peter and Schaper, Mirko}, year={2022}, pages={88–104}
}'
chicago: 'Pramanik, Sudipta, Frederik Tasche, Kay-Peter Hoyer, and Mirko Schaper.
“Orientation-Dependent Indentation Behaviour of Additively Manufactured FeCo Sample:
A Quasi In-Situ Study.” Magnetism 2, no. 2 (2022): 88–104. https://doi.org/10.3390/magnetism2020007.'
ieee: 'S. Pramanik, F. Tasche, K.-P. Hoyer, and M. Schaper, “Orientation-Dependent
Indentation Behaviour of Additively Manufactured FeCo Sample: A Quasi In-Situ
Study,” Magnetism, vol. 2, no. 2, pp. 88–104, 2022, doi: 10.3390/magnetism2020007.'
mla: 'Pramanik, Sudipta, et al. “Orientation-Dependent Indentation Behaviour of
Additively Manufactured FeCo Sample: A Quasi In-Situ Study.” Magnetism,
vol. 2, no. 2, MDPI AG, 2022, pp. 88–104, doi:10.3390/magnetism2020007.'
short: S. Pramanik, F. Tasche, K.-P. Hoyer, M. Schaper, Magnetism 2 (2022) 88–104.
date_created: 2023-02-02T14:29:57Z
date_updated: 2023-04-27T16:46:28Z
department:
- _id: '9'
- _id: '158'
doi: 10.3390/magnetism2020007
intvolume: ' 2'
issue: '2'
keyword:
- General Earth and Planetary Sciences
- General Environmental Science
language:
- iso: eng
page: 88-104
publication: Magnetism
publication_identifier:
issn:
- 2673-8724
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: 'Orientation-Dependent Indentation Behaviour of Additively Manufactured FeCo
Sample: A Quasi In-Situ Study'
type: journal_article
user_id: '43720'
volume: 2
year: '2022'
...
---
_id: '41490'
article_number: '107235'
author:
- first_name: Maxwell
full_name: Hein, Maxwell
last_name: Hein
- first_name: Nelson Filipe
full_name: Lopes Dias, Nelson Filipe
last_name: Lopes Dias
- first_name: David
full_name: Kokalj, David
last_name: Kokalj
- first_name: Dominic
full_name: Stangier, Dominic
last_name: Stangier
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
last_name: Hoyer
- first_name: Wolfgang
full_name: Tillmann, Wolfgang
last_name: Tillmann
- first_name: Mirko
full_name: Schaper, Mirko
last_name: Schaper
citation:
ama: Hein M, Lopes Dias NF, Kokalj D, et al. On the influence of physical vapor
deposited thin coatings on the low-cycle fatigue behavior of additively processed
Ti-6Al-7Nb alloy. International Journal of Fatigue. 2022;166. doi:10.1016/j.ijfatigue.2022.107235
apa: Hein, M., Lopes Dias, N. F., Kokalj, D., Stangier, D., Hoyer, K.-P., Tillmann,
W., & Schaper, M. (2022). On the influence of physical vapor deposited thin
coatings on the low-cycle fatigue behavior of additively processed Ti-6Al-7Nb
alloy. International Journal of Fatigue, 166, Article 107235. https://doi.org/10.1016/j.ijfatigue.2022.107235
bibtex: '@article{Hein_Lopes Dias_Kokalj_Stangier_Hoyer_Tillmann_Schaper_2022, title={On
the influence of physical vapor deposited thin coatings on the low-cycle fatigue
behavior of additively processed Ti-6Al-7Nb alloy}, volume={166}, DOI={10.1016/j.ijfatigue.2022.107235},
number={107235}, journal={International Journal of Fatigue}, publisher={Elsevier
BV}, author={Hein, Maxwell and Lopes Dias, Nelson Filipe and Kokalj, David and
Stangier, Dominic and Hoyer, Kay-Peter and Tillmann, Wolfgang and Schaper, Mirko},
year={2022} }'
chicago: Hein, Maxwell, Nelson Filipe Lopes Dias, David Kokalj, Dominic Stangier,
Kay-Peter Hoyer, Wolfgang Tillmann, and Mirko Schaper. “On the Influence of Physical
Vapor Deposited Thin Coatings on the Low-Cycle Fatigue Behavior of Additively
Processed Ti-6Al-7Nb Alloy.” International Journal of Fatigue 166 (2022).
https://doi.org/10.1016/j.ijfatigue.2022.107235.
ieee: 'M. Hein et al., “On the influence of physical vapor deposited thin
coatings on the low-cycle fatigue behavior of additively processed Ti-6Al-7Nb
alloy,” International Journal of Fatigue, vol. 166, Art. no. 107235, 2022,
doi: 10.1016/j.ijfatigue.2022.107235.'
mla: Hein, Maxwell, et al. “On the Influence of Physical Vapor Deposited Thin Coatings
on the Low-Cycle Fatigue Behavior of Additively Processed Ti-6Al-7Nb Alloy.” International
Journal of Fatigue, vol. 166, 107235, Elsevier BV, 2022, doi:10.1016/j.ijfatigue.2022.107235.
short: M. Hein, N.F. Lopes Dias, D. Kokalj, D. Stangier, K.-P. Hoyer, W. Tillmann,
M. Schaper, International Journal of Fatigue 166 (2022).
date_created: 2023-02-02T14:23:43Z
date_updated: 2023-04-27T16:48:10Z
department:
- _id: '9'
- _id: '158'
doi: 10.1016/j.ijfatigue.2022.107235
intvolume: ' 166'
keyword:
- Industrial and Manufacturing Engineering
- Mechanical Engineering
- Mechanics of Materials
- General Materials Science
- Modeling and Simulation
language:
- iso: eng
publication: International Journal of Fatigue
publication_identifier:
issn:
- 0142-1123
publication_status: published
publisher: Elsevier BV
status: public
title: On the influence of physical vapor deposited thin coatings on the low-cycle
fatigue behavior of additively processed Ti-6Al-7Nb alloy
type: journal_article
user_id: '48411'
volume: 166
year: '2022'
...
---
_id: '44238'
abstract:
- lang: eng
text: In numerous turbomachinery applications, e.g., in aero-engines with
regenerators for improving specific fuel consumption (SFC), heat exchangers with
low-pressure loss are required. Pil low-plate heat exchangers (PPHE) are a novel
exchanger type and promising candidates for high-speed flow applications due to
their smooth profiles avoiding blunt obstacles in the flow path. This work deals
with the overall system behavior and gas dynamics of pillow-plate channels. A
pillow-plate channel was placed in the test section of a blow-down wind tunnel
working with dry air, and compressible flow phenomena were investigated utilizing
conventional and focusing schlieren optics; furthermore, static and total pressure
measurements were performed. The experiments supported the assumption that the
system behavior can be described through a Fanno–Rayleigh flow model. Since only
wavy walls with smooth profiles were involved, linearized gas dynamics was able
to cover important flow features within the channel. The effects of the wavy wall
structures on pressure drop and Mach number distribution within the flow path
were investigated, and a good qualitative agreement with theoretical and numerical
predictions was found. The present analysis demonstrates that pressure losses
in pillow-plate heat exchangers are rather low, although their strong turbulent
mixing enables high convective heat transfer coefficients.
article_number: '12'
author:
- first_name: Stephan
full_name: Sundermeier, Stephan
last_name: Sundermeier
- first_name: Maximilian
full_name: Passmann, Maximilian
last_name: Passmann
- first_name: Stefan
full_name: aus der Wiesche, Stefan
last_name: aus der Wiesche
- first_name: Eugeny Y.
full_name: Kenig, Eugeny Y.
id: '665'
last_name: Kenig
citation:
ama: Sundermeier S, Passmann M, aus der Wiesche S, Kenig EY. Flow in Pillow-Plate
Channels for High-Speed Turbomachinery Heat Exchangers. International Journal
of Turbomachinery, Propulsion and Power. 2022;7(2). doi:10.3390/ijtpp7020012
apa: Sundermeier, S., Passmann, M., aus der Wiesche, S., & Kenig, E. Y. (2022).
Flow in Pillow-Plate Channels for High-Speed Turbomachinery Heat Exchangers. International
Journal of Turbomachinery, Propulsion and Power, 7(2), Article 12.
https://doi.org/10.3390/ijtpp7020012
bibtex: '@article{Sundermeier_Passmann_aus der Wiesche_Kenig_2022, title={Flow in
Pillow-Plate Channels for High-Speed Turbomachinery Heat Exchangers}, volume={7},
DOI={10.3390/ijtpp7020012},
number={212}, journal={International Journal of Turbomachinery, Propulsion and
Power}, publisher={MDPI AG}, author={Sundermeier, Stephan and Passmann, Maximilian
and aus der Wiesche, Stefan and Kenig, Eugeny Y.}, year={2022} }'
chicago: Sundermeier, Stephan, Maximilian Passmann, Stefan aus der Wiesche, and
Eugeny Y. Kenig. “Flow in Pillow-Plate Channels for High-Speed Turbomachinery
Heat Exchangers.” International Journal of Turbomachinery, Propulsion and Power
7, no. 2 (2022). https://doi.org/10.3390/ijtpp7020012.
ieee: 'S. Sundermeier, M. Passmann, S. aus der Wiesche, and E. Y. Kenig, “Flow in
Pillow-Plate Channels for High-Speed Turbomachinery Heat Exchangers,” International
Journal of Turbomachinery, Propulsion and Power, vol. 7, no. 2, Art. no. 12,
2022, doi: 10.3390/ijtpp7020012.'
mla: Sundermeier, Stephan, et al. “Flow in Pillow-Plate Channels for High-Speed
Turbomachinery Heat Exchangers.” International Journal of Turbomachinery, Propulsion
and Power, vol. 7, no. 2, 12, MDPI AG, 2022, doi:10.3390/ijtpp7020012.
short: S. Sundermeier, M. Passmann, S. aus der Wiesche, E.Y. Kenig, International
Journal of Turbomachinery, Propulsion and Power 7 (2022).
date_created: 2023-04-27T16:21:44Z
date_updated: 2023-04-27T16:53:41Z
department:
- _id: '145'
doi: 10.3390/ijtpp7020012
intvolume: ' 7'
issue: '2'
keyword:
- Mechanical Engineering
- Energy Engineering and Power Technology
- Aerospace Engineering
language:
- iso: eng
publication: International Journal of Turbomachinery, Propulsion and Power
publication_identifier:
issn:
- 2504-186X
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Flow in Pillow-Plate Channels for High-Speed Turbomachinery Heat Exchangers
type: journal_article
user_id: '90390'
volume: 7
year: '2022'
...
---
_id: '44236'
article_number: '117097'
author:
- first_name: Marc
full_name: Wende, Marc
id: '71302'
last_name: Wende
- first_name: Christoph
full_name: Staggenborg, Christoph
last_name: Staggenborg
- first_name: Eugeny Y.
full_name: Kenig, Eugeny Y.
id: '665'
last_name: Kenig
citation:
ama: Wende M, Staggenborg C, Kenig EY. Modelling and simulation of zero-gravity
distillation units with metal foams. Chemical Engineering Science. 2022;247.
doi:10.1016/j.ces.2021.117097
apa: Wende, M., Staggenborg, C., & Kenig, E. Y. (2022). Modelling and simulation
of zero-gravity distillation units with metal foams. Chemical Engineering Science,
247, Article 117097. https://doi.org/10.1016/j.ces.2021.117097
bibtex: '@article{Wende_Staggenborg_Kenig_2022, title={Modelling and simulation
of zero-gravity distillation units with metal foams}, volume={247}, DOI={10.1016/j.ces.2021.117097},
number={117097}, journal={Chemical Engineering Science}, publisher={Elsevier BV},
author={Wende, Marc and Staggenborg, Christoph and Kenig, Eugeny Y.}, year={2022}
}'
chicago: Wende, Marc, Christoph Staggenborg, and Eugeny Y. Kenig. “Modelling and
Simulation of Zero-Gravity Distillation Units with Metal Foams.” Chemical Engineering
Science 247 (2022). https://doi.org/10.1016/j.ces.2021.117097.
ieee: 'M. Wende, C. Staggenborg, and E. Y. Kenig, “Modelling and simulation of zero-gravity
distillation units with metal foams,” Chemical Engineering Science, vol.
247, Art. no. 117097, 2022, doi: 10.1016/j.ces.2021.117097.'
mla: Wende, Marc, et al. “Modelling and Simulation of Zero-Gravity Distillation
Units with Metal Foams.” Chemical Engineering Science, vol. 247, 117097,
Elsevier BV, 2022, doi:10.1016/j.ces.2021.117097.
short: M. Wende, C. Staggenborg, E.Y. Kenig, Chemical Engineering Science 247 (2022).
date_created: 2023-04-27T16:06:49Z
date_updated: 2023-04-28T10:57:47Z
department:
- _id: '145'
doi: 10.1016/j.ces.2021.117097
intvolume: ' 247'
keyword:
- Applied Mathematics
- Industrial and Manufacturing Engineering
- General Chemical Engineering
- General Chemistry
language:
- iso: eng
publication: Chemical Engineering Science
publication_identifier:
issn:
- 0009-2509
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Modelling and simulation of zero-gravity distillation units with metal foams
type: journal_article
user_id: '665'
volume: 247
year: '2022'
...
---
_id: '31496'
abstract:
- lang: eng
text: Carbon fiber reinforced plastics (CFRPs) gained high interest in industrial
applications because of their excellent strength and low specific weight. The
stacking sequence of the unidirectional plies forming a CFRP laminate, and their
thicknesses, primarily determine the mechanical performance. However, during manufacturing,
defects, e.g., pores and residual stresses, are induced, both affecting the mechanical
properties. The objective of the present work is to accurately measure residual
stresses in CFRPs as well as to investigate the effects of stacking sequence,
overall laminate thickness, and the presence of pores on the residual stress state.
Residual stresses were measured through the incremental hole-drilling method (HDM).
Adequate procedures have been applied to evaluate the residual stresses for orthotropic
materials, including calculating the calibration coefficients through finite element
analysis (FEA) based on stacking sequence, laminate thickness and mechanical properties.
Using optical microscopy (OM) and computed tomography (CT), profound insights
into the cross-sectional and three-dimensional microstructure, e.g., location
and shape of process-induced pores, were obtained. This microstructural information
allowed for a comprehensive understanding of the experimentally determined strain
and stress results, particularly at the transition zone between the individual
plies. The effect of pores on residual stresses was investigated by considering
pores to calculate the calibration coefficients at a depth of 0.06 mm to 0.12
mm in the model and utilizing these results for residual stress evaluation. A
maximum difference of 46% in stress between defect-free and porous material sample
conditions was observed at a hole depth of 0.65 mm. The significance of employing
correctly calculated coefficients for the residual stress evaluation is highlighted
by mechanical validation tests.
article_number: '138'
author:
- first_name: Tao
full_name: Wu, Tao
last_name: Wu
- first_name: Roland
full_name: Kruse, Roland
last_name: Kruse
- first_name: Steffen Rainer
full_name: Tinkloh, Steffen Rainer
id: '72722'
last_name: Tinkloh
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
- first_name: Wolfgang
full_name: Zinn, Wolfgang
last_name: Zinn
- first_name: Christian
full_name: Lauhoff, Christian
last_name: Lauhoff
- first_name: Thomas
full_name: Niendorf, Thomas
last_name: Niendorf
citation:
ama: 'Wu T, Kruse R, Tinkloh SR, et al. Experimental Analysis of Residual Stresses
in CFRPs through Hole-Drilling Method: The Role of Stacking Sequence, Thickness,
and Defects. Journal of Composites Science. 2022;6(5). doi:10.3390/jcs6050138'
apa: 'Wu, T., Kruse, R., Tinkloh, S. R., Tröster, T., Zinn, W., Lauhoff, C., &
Niendorf, T. (2022). Experimental Analysis of Residual Stresses in CFRPs through
Hole-Drilling Method: The Role of Stacking Sequence, Thickness, and Defects. Journal
of Composites Science, 6(5), Article 138. https://doi.org/10.3390/jcs6050138'
bibtex: '@article{Wu_Kruse_Tinkloh_Tröster_Zinn_Lauhoff_Niendorf_2022, title={Experimental
Analysis of Residual Stresses in CFRPs through Hole-Drilling Method: The Role
of Stacking Sequence, Thickness, and Defects}, volume={6}, DOI={10.3390/jcs6050138},
number={5138}, journal={Journal of Composites Science}, publisher={MDPI AG}, author={Wu,
Tao and Kruse, Roland and Tinkloh, Steffen Rainer and Tröster, Thomas and Zinn,
Wolfgang and Lauhoff, Christian and Niendorf, Thomas}, year={2022} }'
chicago: 'Wu, Tao, Roland Kruse, Steffen Rainer Tinkloh, Thomas Tröster, Wolfgang
Zinn, Christian Lauhoff, and Thomas Niendorf. “Experimental Analysis of Residual
Stresses in CFRPs through Hole-Drilling Method: The Role of Stacking Sequence,
Thickness, and Defects.” Journal of Composites Science 6, no. 5 (2022).
https://doi.org/10.3390/jcs6050138.'
ieee: 'T. Wu et al., “Experimental Analysis of Residual Stresses in CFRPs
through Hole-Drilling Method: The Role of Stacking Sequence, Thickness, and Defects,”
Journal of Composites Science, vol. 6, no. 5, Art. no. 138, 2022, doi:
10.3390/jcs6050138.'
mla: 'Wu, Tao, et al. “Experimental Analysis of Residual Stresses in CFRPs through
Hole-Drilling Method: The Role of Stacking Sequence, Thickness, and Defects.”
Journal of Composites Science, vol. 6, no. 5, 138, MDPI AG, 2022, doi:10.3390/jcs6050138.'
short: T. Wu, R. Kruse, S.R. Tinkloh, T. Tröster, W. Zinn, C. Lauhoff, T. Niendorf,
Journal of Composites Science 6 (2022).
date_created: 2022-05-30T07:04:34Z
date_updated: 2023-04-28T11:31:42Z
department:
- _id: '149'
- _id: '321'
doi: 10.3390/jcs6050138
funded_apc: '1'
intvolume: ' 6'
issue: '5'
keyword:
- Engineering (miscellaneous)
- Ceramics and Composites
language:
- iso: eng
publication: Journal of Composites Science
publication_identifier:
issn:
- 2504-477X
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: 'Experimental Analysis of Residual Stresses in CFRPs through Hole-Drilling
Method: The Role of Stacking Sequence, Thickness, and Defects'
type: journal_article
user_id: '72722'
volume: 6
year: '2022'
...
---
_id: '32814'
article_number: '116071'
author:
- first_name: T.
full_name: Wu, T.
last_name: Wu
- first_name: S.
full_name: Degener, S.
last_name: Degener
- first_name: Steffen Rainer
full_name: Tinkloh, Steffen Rainer
id: '72722'
last_name: Tinkloh
- first_name: A.
full_name: Liehr, A.
last_name: Liehr
- first_name: W.
full_name: Zinn, W.
last_name: Zinn
- first_name: J.P.
full_name: Nobre, J.P.
last_name: Nobre
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
- first_name: T.
full_name: Niendorf, T.
last_name: Niendorf
citation:
ama: Wu T, Degener S, Tinkloh SR, et al. Characterization of residual stresses in
fiber metal laminate interfaces - A combined approach applying hole-drilling method
and energy-dispersive X-ray diffraction. Composite Structures. Published
online 2022. doi:10.1016/j.compstruct.2022.116071
apa: Wu, T., Degener, S., Tinkloh, S. R., Liehr, A., Zinn, W., Nobre, J. P., Tröster,
T., & Niendorf, T. (2022). Characterization of residual stresses in fiber
metal laminate interfaces - A combined approach applying hole-drilling method
and energy-dispersive X-ray diffraction. Composite Structures, Article
116071. https://doi.org/10.1016/j.compstruct.2022.116071
bibtex: '@article{Wu_Degener_Tinkloh_Liehr_Zinn_Nobre_Tröster_Niendorf_2022, title={Characterization
of residual stresses in fiber metal laminate interfaces - A combined approach
applying hole-drilling method and energy-dispersive X-ray diffraction}, DOI={10.1016/j.compstruct.2022.116071},
number={116071}, journal={Composite Structures}, publisher={Elsevier BV}, author={Wu,
T. and Degener, S. and Tinkloh, Steffen Rainer and Liehr, A. and Zinn, W. and
Nobre, J.P. and Tröster, Thomas and Niendorf, T.}, year={2022} }'
chicago: Wu, T., S. Degener, Steffen Rainer Tinkloh, A. Liehr, W. Zinn, J.P. Nobre,
Thomas Tröster, and T. Niendorf. “Characterization of Residual Stresses in Fiber
Metal Laminate Interfaces - A Combined Approach Applying Hole-Drilling Method
and Energy-Dispersive X-Ray Diffraction.” Composite Structures, 2022. https://doi.org/10.1016/j.compstruct.2022.116071.
ieee: 'T. Wu et al., “Characterization of residual stresses in fiber metal
laminate interfaces - A combined approach applying hole-drilling method and energy-dispersive
X-ray diffraction,” Composite Structures, Art. no. 116071, 2022, doi: 10.1016/j.compstruct.2022.116071.'
mla: Wu, T., et al. “Characterization of Residual Stresses in Fiber Metal Laminate
Interfaces - A Combined Approach Applying Hole-Drilling Method and Energy-Dispersive
X-Ray Diffraction.” Composite Structures, 116071, Elsevier BV, 2022, doi:10.1016/j.compstruct.2022.116071.
short: T. Wu, S. Degener, S.R. Tinkloh, A. Liehr, W. Zinn, J.P. Nobre, T. Tröster,
T. Niendorf, Composite Structures (2022).
date_created: 2022-08-15T11:03:54Z
date_updated: 2023-04-28T11:31:56Z
department:
- _id: '149'
- _id: '321'
doi: 10.1016/j.compstruct.2022.116071
keyword:
- Civil and Structural Engineering
- Ceramics and Composites
language:
- iso: eng
publication: Composite Structures
publication_identifier:
issn:
- 0263-8223
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Characterization of residual stresses in fiber metal laminate interfaces -
A combined approach applying hole-drilling method and energy-dispersive X-ray diffraction
type: journal_article
user_id: '72722'
year: '2022'
...
---
_id: '29951'
abstract:
- lang: eng
text: The components of a body in white consist of many individual thin-walled sheet
metal parts, which usually are manufactured in deep-drawing processes. In general,
the conditions in a deep-drawing process change due to changing tribology conditions,
varying degrees of spring back, or scattering material properties in the sheet
blanks, which affects the resulting pre-strain. Mechanical joining processes,
especially clinching, are influenced by these process-related pre-strains. The
final geometric shape of a clinched joint is affected to a significant level by
the prior material deformation when joining with constant process parameters.
That leads to a change in the stiffness and force transmission in the clinched
joint due to the different geometric dimensions, such as interlock, neck thickness
and bottom thickness, which directly affect the load bearing capacity. Here, the
influence of the pre-straining in the deep drawing process on the force distribution
in clinch points in an automotive assembly is investigated by finite-element models
numerically. In further studies, the results are implemented in an optimization
tool for designing clinched components. The methodology starts with a pre-straining
of metal sheets. This step is followed by 2D rotationally symmetric forming simulations
of the joining process. The resulting mesh of each forming simulation is rotated
and 3D models are obtained. The clinched joint solid model with pre-strains is
used further to determine the joint stiffnesses. With the simulation of the same
test set-up with an equivalent point-connector model, the equivalent stiffness
for each pre-strain combination is determined. Simulations are performed on a
clinched component to assess the influence of pre-strain and sheet thinning on
the clinched joint loadings by using the equivalent stiffnesses. The investigations
clearly show that for the selected component, the loadings at the clinch points
are dependent on the sheet thinning and the stiffnesses due to pre-strain. The
magnitude of the influence varies depending on the quantity considered. For example,
the shear force is more sensitive to the joint stiffness than to the sheet thinning.
author:
- first_name: Sven
full_name: Martin, Sven
id: '38177'
last_name: Martin
- first_name: Christian Roman
full_name: Bielak, Christian Roman
id: '34782'
last_name: Bielak
- first_name: Mathias
full_name: Bobbert, Mathias
id: '7850'
last_name: Bobbert
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: Martin S, Bielak CR, Bobbert M, Tröster T, Meschut G. Numerical investigation
of the clinched joint loadings considering the initial pre-strain in the joining
area. Production Engineering. Published online 2022. doi:10.1007/s11740-021-01103-w
apa: Martin, S., Bielak, C. R., Bobbert, M., Tröster, T., & Meschut, G. (2022).
Numerical investigation of the clinched joint loadings considering the initial
pre-strain in the joining area. Production Engineering. https://doi.org/10.1007/s11740-021-01103-w
bibtex: '@article{Martin_Bielak_Bobbert_Tröster_Meschut_2022, title={Numerical investigation
of the clinched joint loadings considering the initial pre-strain in the joining
area}, DOI={10.1007/s11740-021-01103-w},
journal={Production Engineering}, publisher={Springer Science and Business Media
LLC}, author={Martin, Sven and Bielak, Christian Roman and Bobbert, Mathias and
Tröster, Thomas and Meschut, Gerson}, year={2022} }'
chicago: Martin, Sven, Christian Roman Bielak, Mathias Bobbert, Thomas Tröster,
and Gerson Meschut. “Numerical Investigation of the Clinched Joint Loadings Considering
the Initial Pre-Strain in the Joining Area.” Production Engineering, 2022.
https://doi.org/10.1007/s11740-021-01103-w.
ieee: 'S. Martin, C. R. Bielak, M. Bobbert, T. Tröster, and G. Meschut, “Numerical
investigation of the clinched joint loadings considering the initial pre-strain
in the joining area,” Production Engineering, 2022, doi: 10.1007/s11740-021-01103-w.'
mla: Martin, Sven, et al. “Numerical Investigation of the Clinched Joint Loadings
Considering the Initial Pre-Strain in the Joining Area.” Production Engineering,
Springer Science and Business Media LLC, 2022, doi:10.1007/s11740-021-01103-w.
short: S. Martin, C.R. Bielak, M. Bobbert, T. Tröster, G. Meschut, Production Engineering
(2022).
date_created: 2022-02-22T12:52:09Z
date_updated: 2023-04-28T11:57:22Z
department:
- _id: '321'
- _id: '149'
- _id: '630'
- _id: '157'
doi: 10.1007/s11740-021-01103-w
keyword:
- Industrial and Manufacturing Engineering
- Mechanical Engineering
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://link.springer.com/article/10.1007/s11740-021-01103-w
oa: '1'
project:
- _id: '130'
grant_number: '418701707'
name: 'TRR 285: TRR 285'
- _id: '131'
name: 'TRR 285 - A: TRR 285 - Project Area A'
- _id: '135'
name: 'TRR 285 – A01: TRR 285 - Subproject A01'
- _id: '132'
name: 'TRR 285 - B: TRR 285 - Project Area B'
- _id: '140'
name: 'TRR 285 – B01: TRR 285 - Subproject B01'
publication: Production Engineering
publication_identifier:
issn:
- 0944-6524
- 1863-7353
publication_status: published
publisher: Springer Science and Business Media LLC
quality_controlled: '1'
status: public
title: Numerical investigation of the clinched joint loadings considering the initial
pre-strain in the joining area
type: journal_article
user_id: '38177'
year: '2022'
...
---
_id: '30591'
article_number: '117414'
author:
- first_name: René
full_name: Bertling, René
id: '30050'
last_name: Bertling
- first_name: M.
full_name: Hack, M.
last_name: Hack
- first_name: I.
full_name: Ausner, I.
last_name: Ausner
- first_name: B.
full_name: Horschitz, B.
last_name: Horschitz
- first_name: Sören Antonius
full_name: Bernemann, Sören Antonius
id: '70108'
last_name: Bernemann
- first_name: Eugeny
full_name: Kenig, Eugeny
id: '665'
last_name: Kenig
citation:
ama: Bertling R, Hack M, Ausner I, Horschitz B, Bernemann SA, Kenig E. Modelling
film and rivulet flows on microstructured surfaces using CFD methods. Chemical
Engineering Science. 2022;251. doi:10.1016/j.ces.2021.117414
apa: Bertling, R., Hack, M., Ausner, I., Horschitz, B., Bernemann, S. A., &
Kenig, E. (2022). Modelling film and rivulet flows on microstructured surfaces
using CFD methods. Chemical Engineering Science, 251, Article 117414.
https://doi.org/10.1016/j.ces.2021.117414
bibtex: '@article{Bertling_Hack_Ausner_Horschitz_Bernemann_Kenig_2022, title={Modelling
film and rivulet flows on microstructured surfaces using CFD methods}, volume={251},
DOI={10.1016/j.ces.2021.117414},
number={117414}, journal={Chemical Engineering Science}, publisher={Elsevier BV},
author={Bertling, René and Hack, M. and Ausner, I. and Horschitz, B. and Bernemann,
Sören Antonius and Kenig, Eugeny}, year={2022} }'
chicago: Bertling, René, M. Hack, I. Ausner, B. Horschitz, Sören Antonius Bernemann,
and Eugeny Kenig. “Modelling Film and Rivulet Flows on Microstructured Surfaces
Using CFD Methods.” Chemical Engineering Science 251 (2022). https://doi.org/10.1016/j.ces.2021.117414.
ieee: 'R. Bertling, M. Hack, I. Ausner, B. Horschitz, S. A. Bernemann, and E. Kenig,
“Modelling film and rivulet flows on microstructured surfaces using CFD methods,”
Chemical Engineering Science, vol. 251, Art. no. 117414, 2022, doi: 10.1016/j.ces.2021.117414.'
mla: Bertling, René, et al. “Modelling Film and Rivulet Flows on Microstructured
Surfaces Using CFD Methods.” Chemical Engineering Science, vol. 251, 117414,
Elsevier BV, 2022, doi:10.1016/j.ces.2021.117414.
short: R. Bertling, M. Hack, I. Ausner, B. Horschitz, S.A. Bernemann, E. Kenig,
Chemical Engineering Science 251 (2022).
date_created: 2022-03-28T07:26:33Z
date_updated: 2023-05-01T07:53:08Z
department:
- _id: '9'
- _id: '145'
doi: 10.1016/j.ces.2021.117414
intvolume: ' 251'
keyword:
- Applied Mathematics
- Industrial and Manufacturing Engineering
- General Chemical Engineering
- General Chemistry
language:
- iso: eng
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: Chemical Engineering Science
publication_identifier:
issn:
- 0009-2509
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Modelling film and rivulet flows on microstructured surfaces using CFD methods
type: journal_article
user_id: '30050'
volume: 251
year: '2022'
...
---
_id: '30382'
article_number: '117414'
author:
- first_name: R.
full_name: Bertling, R.
last_name: Bertling
- first_name: M.
full_name: Hack, M.
last_name: Hack
- first_name: I.
full_name: Ausner, I.
last_name: Ausner
- first_name: B.
full_name: Horschitz, B.
last_name: Horschitz
- first_name: S.
full_name: Bernemann, S.
last_name: Bernemann
- first_name: E.Y.
full_name: Kenig, E.Y.
last_name: Kenig
citation:
ama: Bertling R, Hack M, Ausner I, Horschitz B, Bernemann S, Kenig EY. Modelling
film and rivulet flows on microstructured surfaces using CFD methods. Chemical
Engineering Science. 2022;251. doi:10.1016/j.ces.2021.117414
apa: Bertling, R., Hack, M., Ausner, I., Horschitz, B., Bernemann, S., & Kenig,
E. Y. (2022). Modelling film and rivulet flows on microstructured surfaces using
CFD methods. Chemical Engineering Science, 251, Article 117414.
https://doi.org/10.1016/j.ces.2021.117414
bibtex: '@article{Bertling_Hack_Ausner_Horschitz_Bernemann_Kenig_2022, title={Modelling
film and rivulet flows on microstructured surfaces using CFD methods}, volume={251},
DOI={10.1016/j.ces.2021.117414},
number={117414}, journal={Chemical Engineering Science}, publisher={Elsevier BV},
author={Bertling, R. and Hack, M. and Ausner, I. and Horschitz, B. and Bernemann,
S. and Kenig, E.Y.}, year={2022} }'
chicago: Bertling, R., M. Hack, I. Ausner, B. Horschitz, S. Bernemann, and E.Y.
Kenig. “Modelling Film and Rivulet Flows on Microstructured Surfaces Using CFD
Methods.” Chemical Engineering Science 251 (2022). https://doi.org/10.1016/j.ces.2021.117414.
ieee: 'R. Bertling, M. Hack, I. Ausner, B. Horschitz, S. Bernemann, and E. Y. Kenig,
“Modelling film and rivulet flows on microstructured surfaces using CFD methods,”
Chemical Engineering Science, vol. 251, Art. no. 117414, 2022, doi: 10.1016/j.ces.2021.117414.'
mla: Bertling, R., et al. “Modelling Film and Rivulet Flows on Microstructured Surfaces
Using CFD Methods.” Chemical Engineering Science, vol. 251, 117414, Elsevier
BV, 2022, doi:10.1016/j.ces.2021.117414.
short: R. Bertling, M. Hack, I. Ausner, B. Horschitz, S. Bernemann, E.Y. Kenig,
Chemical Engineering Science 251 (2022).
date_created: 2022-03-20T09:39:03Z
date_updated: 2023-05-01T07:54:36Z
doi: 10.1016/j.ces.2021.117414
intvolume: ' 251'
keyword:
- Applied Mathematics
- Industrial and Manufacturing Engineering
- General Chemical Engineering
- General Chemistry
language:
- iso: eng
publication: Chemical Engineering Science
publication_identifier:
issn:
- 0009-2509
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Modelling film and rivulet flows on microstructured surfaces using CFD methods
type: journal_article
user_id: '30050'
volume: 251
year: '2022'
...
---
_id: '34000'
abstract:
- lang: eng
text: "Abstract\r\n This paper presents
the characterization of the microstructure evolution during flow forming of austenitic
stainless steel AISI 304L. Due to plastic deformation of metastable austenitic
steel, phase transformation from γ-austenite into α’-martensite occurs. This is
initiated by the formation of shear bands as product of the external stresses.
By means of coupled microscopic and micromagnetic investigations, a characterization
of the microstructure was carried out. In particular, this study shows the distribution
of the strain-induced α’-martensite and its influence on material properties like
hardness at different depths. The microstructural analyses by means of electron
backscattered diffraction (EBSD) technique, evidence a higher amount of α’-martensite
(ca. 23 %) close to the outer specimen surface, where the plastic deformation
and the direct contact with the forming tool take place. In the middle area (ca.
1.5 mm depth from the outer surface), the portion of transformed α’-martensite
drops to 7 % and in the inner surface to 2 %. These results are well correlated
with microhardness and micromagnetic measurements at different depths. EBSD and
atomic force microscopy (AFM) were used to make a detailed characterization of
the topography and degree of deformation of the shear bands. Likewise, the mechanisms
of nucleation of α’-martensite were discussed. This research contributes to the
development of micromagnetic sensors to monitor the evolution of properties during
flow forming. This makes them more suitable for closed-loop property control,
which offers possibilities for an application-oriented and more efficient production."
author:
- first_name: Julian
full_name: Rozo Vasquez, Julian
last_name: Rozo Vasquez
- first_name: Hanigah
full_name: Kanagarajah, Hanigah
last_name: Kanagarajah
- first_name: Bahman
full_name: Arian, Bahman
id: '36287'
last_name: Arian
- first_name: Lukas
full_name: Kersting, Lukas
last_name: Kersting
- first_name: Werner
full_name: Homberg, Werner
id: '233'
last_name: Homberg
- first_name: Ansgar
full_name: Trächtler, Ansgar
id: '552'
last_name: Trächtler
- first_name: Frank
full_name: Walther, Frank
last_name: Walther
citation:
ama: Rozo Vasquez J, Kanagarajah H, Arian B, et al. Coupled microscopic and micromagnetic
depth-specific analysis of plastic deformation and phase transformation of metastable
austenitic steel AISI 304L by flow forming. Practical Metallography. 2022;59(11):660-675.
doi:10.1515/pm-2022-0064
apa: Rozo Vasquez, J., Kanagarajah, H., Arian, B., Kersting, L., Homberg, W., Trächtler,
A., & Walther, F. (2022). Coupled microscopic and micromagnetic depth-specific
analysis of plastic deformation and phase transformation of metastable austenitic
steel AISI 304L by flow forming. Practical Metallography, 59(11),
660–675. https://doi.org/10.1515/pm-2022-0064
bibtex: '@article{Rozo Vasquez_Kanagarajah_Arian_Kersting_Homberg_Trächtler_Walther_2022,
title={Coupled microscopic and micromagnetic depth-specific analysis of plastic
deformation and phase transformation of metastable austenitic steel AISI 304L
by flow forming}, volume={59}, DOI={10.1515/pm-2022-0064},
number={11}, journal={Practical Metallography}, publisher={Walter de Gruyter GmbH},
author={Rozo Vasquez, Julian and Kanagarajah, Hanigah and Arian, Bahman and Kersting,
Lukas and Homberg, Werner and Trächtler, Ansgar and Walther, Frank}, year={2022},
pages={660–675} }'
chicago: 'Rozo Vasquez, Julian, Hanigah Kanagarajah, Bahman Arian, Lukas Kersting,
Werner Homberg, Ansgar Trächtler, and Frank Walther. “Coupled Microscopic and
Micromagnetic Depth-Specific Analysis of Plastic Deformation and Phase Transformation
of Metastable Austenitic Steel AISI 304L by Flow Forming.” Practical Metallography
59, no. 11 (2022): 660–75. https://doi.org/10.1515/pm-2022-0064.'
ieee: 'J. Rozo Vasquez et al., “Coupled microscopic and micromagnetic depth-specific
analysis of plastic deformation and phase transformation of metastable austenitic
steel AISI 304L by flow forming,” Practical Metallography, vol. 59, no.
11, pp. 660–675, 2022, doi: 10.1515/pm-2022-0064.'
mla: Rozo Vasquez, Julian, et al. “Coupled Microscopic and Micromagnetic Depth-Specific
Analysis of Plastic Deformation and Phase Transformation of Metastable Austenitic
Steel AISI 304L by Flow Forming.” Practical Metallography, vol. 59, no.
11, Walter de Gruyter GmbH, 2022, pp. 660–75, doi:10.1515/pm-2022-0064.
short: J. Rozo Vasquez, H. Kanagarajah, B. Arian, L. Kersting, W. Homberg, A. Trächtler,
F. Walther, Practical Metallography 59 (2022) 660–675.
date_created: 2022-11-04T08:29:21Z
date_updated: 2023-05-02T08:19:27Z
department:
- _id: '156'
- _id: '153'
- _id: '241'
doi: 10.1515/pm-2022-0064
intvolume: ' 59'
issue: '11'
keyword:
- Metals and Alloys
- Mechanics of Materials
- Condensed Matter Physics
- Electronic
- Optical and Magnetic Materials
language:
- iso: eng
page: 660-675
publication: Practical Metallography
publication_identifier:
issn:
- 2195-8599
- 0032-678X
publication_status: published
publisher: Walter de Gruyter GmbH
quality_controlled: '1'
status: public
title: Coupled microscopic and micromagnetic depth-specific analysis of plastic deformation
and phase transformation of metastable austenitic steel AISI 304L by flow forming
type: journal_article
user_id: '36287'
volume: 59
year: '2022'
...
---
_id: '30213'
abstract:
- lang: eng
text: Requirement changes and cascading effects of change propagation are
major sources of inefficiencies in product development and increase the risk of
project failure. Proactive change management of requirement changes yields the
potential to handle such changes efficiently. A systematic approach is required
for proactive change management to assess and reduce the risk of a requirement
change with appropriate effort in industrial application. Within the paper at
hand, a novel method for Proactive Management of Requirement Changes (ProMaRC)
is presented. It is developed in close collaboration with industry experts and
evaluated based on workshops, pilot users’ feedback, three industrial case studies
from the automotive industry and five development projects from research. To limit
the application effort, an automated approach for dependency analysis based on
the machine learning technique BERT and semi-automated assessment of change likelihood
and impact using a modified PageRank algorithm is developed. Applying the method,
the risks of requirement changes are assessed systematically and reduced by means
of proactive change measures. Evaluation shows high performance of dependency
analysis and confirms the applicability and usefulness of the method. This contribution
opens up the research space of proactive risk management for requirement changes
which is currently almost unexploited. It enables more efficient product development.
article_number: '1874'
author:
- first_name: Iris
full_name: Gräßler, Iris
id: '47565'
last_name: Gräßler
orcid: 0000-0001-5765-971X
- first_name: Christian
full_name: Oleff, Christian
id: '41188'
last_name: Oleff
orcid: 0000-0002-0983-1850
- first_name: Daniel
full_name: Preuß, Daniel
id: '40253'
last_name: Preuß
citation:
ama: Gräßler I, Oleff C, Preuß D. Proactive Management of Requirement Changes in
the Development of Complex Technical Systems. Applied Sciences. 2022;12(4).
doi:10.3390/app12041874
apa: Gräßler, I., Oleff, C., & Preuß, D. (2022). Proactive Management of Requirement
Changes in the Development of Complex Technical Systems. Applied Sciences,
12(4), Article 1874. https://doi.org/10.3390/app12041874
bibtex: '@article{Gräßler_Oleff_Preuß_2022, title={Proactive Management of Requirement
Changes in the Development of Complex Technical Systems}, volume={12}, DOI={10.3390/app12041874}, number={41874},
journal={Applied Sciences}, publisher={MDPI AG}, author={Gräßler, Iris and Oleff,
Christian and Preuß, Daniel}, year={2022} }'
chicago: Gräßler, Iris, Christian Oleff, and Daniel Preuß. “Proactive Management
of Requirement Changes in the Development of Complex Technical Systems.” Applied
Sciences 12, no. 4 (2022). https://doi.org/10.3390/app12041874.
ieee: 'I. Gräßler, C. Oleff, and D. Preuß, “Proactive Management of Requirement
Changes in the Development of Complex Technical Systems,” Applied Sciences,
vol. 12, no. 4, Art. no. 1874, 2022, doi: 10.3390/app12041874.'
mla: Gräßler, Iris, et al. “Proactive Management of Requirement Changes in the Development
of Complex Technical Systems.” Applied Sciences, vol. 12, no. 4, 1874,
MDPI AG, 2022, doi:10.3390/app12041874.
short: I. Gräßler, C. Oleff, D. Preuß, Applied Sciences 12 (2022).
date_created: 2022-03-08T12:37:42Z
date_updated: 2023-05-03T08:40:30Z
department:
- _id: '152'
doi: 10.3390/app12041874
intvolume: ' 12'
issue: '4'
keyword:
- Fluid Flow and Transfer Processes
- Computer Science Applications
- Process Chemistry and Technology
- General Engineering
- Instrumentation
- General Materials Science
language:
- iso: eng
publication: Applied Sciences
publication_identifier:
issn:
- 2076-3417
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Proactive Management of Requirement Changes in the Development of Complex Technical
Systems
type: journal_article
user_id: '5905'
volume: 12
year: '2022'
...
---
_id: '44469'
article_number: '2100397'
author:
- first_name: Dennis
full_name: Menge, Dennis
id: '29240'
last_name: Menge
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
citation:
ama: Menge D, Schmid H-J. Low Temperature Laser Sintering with PA12 and PA6 on a
Standard System. Macromolecular Symposia. 2022;404(1). doi:10.1002/masy.202100397
apa: Menge, D., & Schmid, H.-J. (2022). Low Temperature Laser Sintering with
PA12 and PA6 on a Standard System. Macromolecular Symposia, 404(1),
Article 2100397. https://doi.org/10.1002/masy.202100397
bibtex: '@article{Menge_Schmid_2022, title={Low Temperature Laser Sintering with
PA12 and PA6 on a Standard System}, volume={404}, DOI={10.1002/masy.202100397},
number={12100397}, journal={Macromolecular Symposia}, publisher={Wiley}, author={Menge,
Dennis and Schmid, Hans-Joachim}, year={2022} }'
chicago: Menge, Dennis, and Hans-Joachim Schmid. “Low Temperature Laser Sintering
with PA12 and PA6 on a Standard System.” Macromolecular Symposia 404, no.
1 (2022). https://doi.org/10.1002/masy.202100397.
ieee: 'D. Menge and H.-J. Schmid, “Low Temperature Laser Sintering with PA12 and
PA6 on a Standard System,” Macromolecular Symposia, vol. 404, no. 1, Art.
no. 2100397, 2022, doi: 10.1002/masy.202100397.'
mla: Menge, Dennis, and Hans-Joachim Schmid. “Low Temperature Laser Sintering with
PA12 and PA6 on a Standard System.” Macromolecular Symposia, vol. 404,
no. 1, 2100397, Wiley, 2022, doi:10.1002/masy.202100397.
short: D. Menge, H.-J. Schmid, Macromolecular Symposia 404 (2022).
date_created: 2023-05-04T08:21:02Z
date_updated: 2023-05-04T08:24:10Z
department:
- _id: '150'
doi: 10.1002/masy.202100397
intvolume: ' 404'
issue: '1'
keyword:
- Materials Chemistry
- Polymers and Plastics
- Organic Chemistry
- Condensed Matter Physics
language:
- iso: eng
publication: Macromolecular Symposia
publication_identifier:
issn:
- 1022-1360
- 1521-3900
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: Low Temperature Laser Sintering with PA12 and PA6 on a Standard System
type: journal_article
user_id: '3959'
volume: 404
year: '2022'
...
---
_id: '42951'
abstract:
- lang: eng
text: 'PurposeInformation
and communication technologies (ICT) has an increasing impact on schools. School
leaders play a key role in this context as drivers of innovation including those
related to ICT. Against this background, the study presented in this article focuses
on school leadership and management activities with ICT and related challenges.
It sought to analyze how frequently German school principals use ICT compared
to principals in other countries, what distinct clusters of German principals
could be identified in terms of ICT usage and how principals viewed ICT in schools
and related challenges.Design/methodology/approachA
mixed-methods approach was chosen, using quantitative data from both the international
comparative large-scale assessment study ICILS 2018 and the explorative qualitative
data from Germany. For the international comparison, the school principal data
sets of the 12 international participants of the International Computer
and Information Literacy Study (ICILS) 2018 were taken into account:
Chile, Denmark, Finland, France, Germany, Italy, Kazakhstan, Republic of Korea,
Luxembourg, Portugal, Uruguay and the United States. To look beyond averaged frequencies,
a latent class analysis (LCA) was conducted to identify possible clusters of school
leaders with distinct usage patterns of ICT for leadership and management activities.FindingsThe results indicate
that, in general, German principals use ICT for leadership and management activities
on a similar level as their international colleagues. However, they seem to communicate
with education authorities significantly more often than their international colleagues,
whereas representative activities (presentations, home page) are rather infrequent.
The qualitative data point to significant barriers to fully harnessing the potential
of using ICT for leadership, management and school improvement such as lack of
competencies and lack of adequate support.Originality/valueTo the
best of the authors’ knowledge, this is the first study that focuses on school
leadership and management activities using ICT with such a data set. The results
provide insights into how German principals use ICT to lead and manage their schools
compared to their international counterparts. The qualitative data offers additional
insights into possible reasons hindering a more effective use of ICT.'
author:
- first_name: Pierre
full_name: Tulowitzki, Pierre
last_name: Tulowitzki
- first_name: Julia
full_name: Gerick, Julia
last_name: Gerick
- first_name: Birgit
full_name: Eickelmann, Birgit
id: '40387'
last_name: Eickelmann
citation:
ama: 'Tulowitzki P, Gerick J, Eickelmann B. The role of ICT for school leadership
and management activities: an international comparison. International Journal
of Educational Management. 2022;36(2):133-151. doi:10.1108/ijem-06-2021-0251'
apa: 'Tulowitzki, P., Gerick, J., & Eickelmann, B. (2022). The role of ICT for
school leadership and management activities: an international comparison. International
Journal of Educational Management, 36(2), 133–151. https://doi.org/10.1108/ijem-06-2021-0251'
bibtex: '@article{Tulowitzki_Gerick_Eickelmann_2022, title={The role of ICT for
school leadership and management activities: an international comparison}, volume={36},
DOI={10.1108/ijem-06-2021-0251},
number={2}, journal={International Journal of Educational Management}, publisher={Emerald},
author={Tulowitzki, Pierre and Gerick, Julia and Eickelmann, Birgit}, year={2022},
pages={133–151} }'
chicago: 'Tulowitzki, Pierre, Julia Gerick, and Birgit Eickelmann. “The Role of
ICT for School Leadership and Management Activities: An International Comparison.”
International Journal of Educational Management 36, no. 2 (2022): 133–51.
https://doi.org/10.1108/ijem-06-2021-0251.'
ieee: 'P. Tulowitzki, J. Gerick, and B. Eickelmann, “The role of ICT for school
leadership and management activities: an international comparison,” International
Journal of Educational Management, vol. 36, no. 2, pp. 133–151, 2022, doi:
10.1108/ijem-06-2021-0251.'
mla: 'Tulowitzki, Pierre, et al. “The Role of ICT for School Leadership and Management
Activities: An International Comparison.” International Journal of Educational
Management, vol. 36, no. 2, Emerald, 2022, pp. 133–51, doi:10.1108/ijem-06-2021-0251.'
short: P. Tulowitzki, J. Gerick, B. Eickelmann, International Journal of Educational
Management 36 (2022) 133–151.
date_created: 2023-03-13T12:27:49Z
date_updated: 2023-05-08T09:03:39Z
department:
- _id: '462'
doi: 10.1108/ijem-06-2021-0251
intvolume: ' 36'
issue: '2'
keyword:
- Organizational Behavior and Human Resource Management
- Education
- Organizational Behavior and Human Resource Management
- Education
language:
- iso: eng
page: 133-151
publication: International Journal of Educational Management
publication_identifier:
issn:
- 0951-354X
publication_status: published
publisher: Emerald
status: public
title: 'The role of ICT for school leadership and management activities: an international
comparison'
type: journal_article
user_id: '14931'
volume: 36
year: '2022'
...
---
_id: '33741'
abstract:
- lang: eng
text: There are many concepts of signed graph coloring which are defined by assigning
colors to the vertices of the graphs. These concepts usually differ in the number
of self-inverse colors used. We introduce a unifying concept for this kind of
coloring by assigning elements from symmetric sets to the vertices of the signed
graphs. In the first part of the paper, we study colorings with elements from
symmetric sets where the number of self-inverse elements is fixed. We prove a
Brooks’-type theorem and upper bounds for the corresponding chromatic numbers
in terms of the chromatic number of the underlying graph. These results are used
in the second part where we introduce the symset-chromatic number χsym(G,σ) of
a signed graph (G,σ). We show that the symset-chromatic number gives the minimum
partition of a signed graph into independent sets and non-bipartite antibalanced
subgraphs. In particular, χsym(G,σ)≤χ(G). In the final section we show that these
colorings can also be formalized as DP-colorings.
author:
- first_name: Chiara
full_name: Cappello, Chiara
id: '72874'
last_name: Cappello
- first_name: Eckhard
full_name: Steffen, Eckhard
id: '15548'
last_name: Steffen
orcid: 0000-0002-9808-7401
citation:
ama: Cappello C, Steffen E. Symmetric Set Coloring of Signed Graphs. Annals of
Combinatorics. Published online 2022. doi:10.1007/s00026-022-00593-4
apa: Cappello, C., & Steffen, E. (2022). Symmetric Set Coloring of Signed Graphs.
Annals of Combinatorics. https://doi.org/10.1007/s00026-022-00593-4
bibtex: '@article{Cappello_Steffen_2022, title={Symmetric Set Coloring of Signed
Graphs}, DOI={10.1007/s00026-022-00593-4},
journal={Annals of Combinatorics}, publisher={Springer Science and Business Media
LLC}, author={Cappello, Chiara and Steffen, Eckhard}, year={2022} }'
chicago: Cappello, Chiara, and Eckhard Steffen. “Symmetric Set Coloring of Signed
Graphs.” Annals of Combinatorics, 2022. https://doi.org/10.1007/s00026-022-00593-4.
ieee: 'C. Cappello and E. Steffen, “Symmetric Set Coloring of Signed Graphs,” Annals
of Combinatorics, 2022, doi: 10.1007/s00026-022-00593-4.'
mla: Cappello, Chiara, and Eckhard Steffen. “Symmetric Set Coloring of Signed Graphs.”
Annals of Combinatorics, Springer Science and Business Media LLC, 2022,
doi:10.1007/s00026-022-00593-4.
short: C. Cappello, E. Steffen, Annals of Combinatorics (2022).
date_created: 2022-10-17T07:54:41Z
date_updated: 2023-05-16T10:37:58Z
department:
- _id: '542'
doi: 10.1007/s00026-022-00593-4
external_id:
arxiv:
- '2106.05928'
keyword:
- Discrete Mathematics and Combinatorics
language:
- iso: eng
publication: Annals of Combinatorics
publication_identifier:
issn:
- 0218-0006
- 0219-3094
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: Symmetric Set Coloring of Signed Graphs
type: journal_article
user_id: '15540'
year: '2022'
...