---
_id: '57699'
abstract:
- lang: eng
text: The optimization of process parameters in powder Directed Energy Deposition
(DED) is essential for achieving consistent, high-quality bead geometries, which
directly influence the performance and structural integrity of fabricated components.
As a subset of additive manufacturing (AM), the DED process, also referred to
as laser metal deposition (LMD), enables precise, layer-by-layer material deposition,
making it highly suitable for complex geometries and part repair applications.
Critical parameters, such as the laser power, feed rate, powder mass flow, and
substrate temperature govern the deposition process, impacting the bead height,
width, contact angle, and dilution. Inconsistent control over these variables
can lead to defects, such as poor bonding, dimensional inaccuracies, and material
weaknesses, ultimately compromising the final product. This paper investigates
the effects of various process parameters, specifically the substrate temperature,
on bead track geometry in DED processes for stainless steel (1.4404). A specialized
experimental setup, integrated within a DED machine, facilitates the controlled
thermal conditioning of sample sheets. Using Design of Experiments (DoE) methods,
individual bead marks are generated and analyzed to assess geometric characteristics.
Regression models, including both linear and quadratic approaches, are constructed
to predict machine parameters for achieving the desired bead geometry at different
substrate temperatures. Validation experiments confirm the accuracy and reliability
of the models, particularly in predicting the bead height, bead width, and contact
angle across a broad range of substrate temperatures. However, the models demonstrated
limitations in accurately predicting dilution, indicating the need for further
refinement. Despite some deviations in measured values, successful fabrication
is achieved, demonstrating robust bonding between the bead and substrate. The
developed models offer insights into optimizing DED process parameters to achieve
desired bead characteristics, advancing the precision and reliability of additive
manufacturing technology. Future work will focus on refining the regression models
to improve predictions, particularly for dilution, and further investigate non-linear
interactions between process variables.
article_number: '1353'
article_type: original
author:
- first_name: Deviprasad
full_name: Chalicheemalapalli Jayasankar, Deviprasad
id: '49504'
last_name: Chalicheemalapalli Jayasankar
orcid: https://orcid.org/ 0000-0002-3446-2444
- first_name: Stefan
full_name: Gnaase, Stefan
id: '25730'
last_name: Gnaase
- first_name: Dennis
full_name: Lehnert, Dennis
id: '90491'
last_name: Lehnert
- first_name: Artur
full_name: Walter, Artur
last_name: Walter
- first_name: Robin
full_name: Rohling, Robin
last_name: Rohling
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
citation:
ama: 'Chalicheemalapalli Jayasankar D, Gnaase S, Lehnert D, Walter A, Rohling R,
Tröster T. Effect of Substrate Temperature on Bead Track Geometry of 316L in Directed
Energy Deposition: Investigation and Regression Modeling. Metals. 2024;14(12).
doi:10.3390/met14121353'
apa: 'Chalicheemalapalli Jayasankar, D., Gnaase, S., Lehnert, D., Walter, A., Rohling,
R., & Tröster, T. (2024). Effect of Substrate Temperature on Bead Track Geometry
of 316L in Directed Energy Deposition: Investigation and Regression Modeling.
Metals, 14(12), Article 1353. https://doi.org/10.3390/met14121353'
bibtex: '@article{Chalicheemalapalli Jayasankar_Gnaase_Lehnert_Walter_Rohling_Tröster_2024,
title={Effect of Substrate Temperature on Bead Track Geometry of 316L in Directed
Energy Deposition: Investigation and Regression Modeling}, volume={14}, DOI={10.3390/met14121353}, number={121353},
journal={Metals}, publisher={MDPI AG}, author={Chalicheemalapalli Jayasankar,
Deviprasad and Gnaase, Stefan and Lehnert, Dennis and Walter, Artur and Rohling,
Robin and Tröster, Thomas}, year={2024} }'
chicago: 'Chalicheemalapalli Jayasankar, Deviprasad, Stefan Gnaase, Dennis Lehnert,
Artur Walter, Robin Rohling, and Thomas Tröster. “Effect of Substrate Temperature
on Bead Track Geometry of 316L in Directed Energy Deposition: Investigation and
Regression Modeling.” Metals 14, no. 12 (2024). https://doi.org/10.3390/met14121353.'
ieee: 'D. Chalicheemalapalli Jayasankar, S. Gnaase, D. Lehnert, A. Walter, R. Rohling,
and T. Tröster, “Effect of Substrate Temperature on Bead Track Geometry of 316L
in Directed Energy Deposition: Investigation and Regression Modeling,” Metals,
vol. 14, no. 12, Art. no. 1353, 2024, doi: 10.3390/met14121353.'
mla: 'Chalicheemalapalli Jayasankar, Deviprasad, et al. “Effect of Substrate Temperature
on Bead Track Geometry of 316L in Directed Energy Deposition: Investigation and
Regression Modeling.” Metals, vol. 14, no. 12, 1353, MDPI AG, 2024, doi:10.3390/met14121353.'
short: D. Chalicheemalapalli Jayasankar, S. Gnaase, D. Lehnert, A. Walter, R. Rohling,
T. Tröster, Metals 14 (2024).
date_created: 2024-12-10T12:13:23Z
date_updated: 2026-03-20T08:44:28Z
ddc:
- '670'
department:
- _id: '321'
- _id: '149'
- _id: '9'
doi: 10.3390/met14121353
has_accepted_license: '1'
intvolume: ' 14'
issue: '12'
keyword:
- additive manufacturing
- direct energy deposition
- laser metal deposition
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.mdpi.com/2075-4701/14/12/1353
oa: '1'
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: 'Effect of Substrate Temperature on Bead Track Geometry of 316L in Directed
Energy Deposition: Investigation and Regression Modeling'
type: journal_article
user_id: '49504'
volume: 14
year: '2024'
...
---
_id: '56089'
abstract:
- lang: eng
text: Additive manufacturing (AM) technologies enable near-net-shape designs
and demand-oriented material usage, which significantly minimizes waste. This
points to a substantial opportunity for further optimization in material savings
and process design. The current study delves into the advancement of sustainable
manufacturing practices in the automotive industry, emphasizing the crucial role
of lightweight construction concepts and AM technologies in enhancing resource
efficiency and reducing greenhouse gas emissions. By exploring the integration
of novel AM techniques such as selective laser melting (SLM) and laser metal deposition
(LMD), the study aims to overcome existing limitations like slow build-up rates
and limited component resolution. The study’s core objective revolves around the
development and validation of a continuous process chain that synergizes different
AM routes. In the current study, the continuous process chain for DMG MORI Lasertec
65 3D’s LMD system and the DMG MORI Lasertec 30 3D’s was demonstrated using 316L
and 1.2709 steel materials. This integrated approach is designed to significantly
curtail process times and minimize component costs, thus suggesting an industry-oriented
process chain for future manufacturing paradigms. Additionally, the research investigates
the production and material behavior of components under varying manufacturing
processes, material combinations, and boundary layer materials. The culmination
of this study is the validation of the proposed process route through a technology
demonstrator, assessing its scalability and setting a benchmark for resource-efficient
manufacturing in the automotive sector.
article_number: '772'
article_type: original
author:
- first_name: Deviprasad
full_name: Chalicheemalapalli Jayasankar, Deviprasad
id: '49504'
last_name: Chalicheemalapalli Jayasankar
orcid: https://orcid.org/ 0000-0002-3446-2444
- first_name: Stefan
full_name: Gnaase, Stefan
id: '25730'
last_name: Gnaase
- first_name: Maximilian Alexander
full_name: Kaiser, Maximilian Alexander
id: '72351'
last_name: Kaiser
orcid: 0009-0008-1333-3396
- first_name: Dennis
full_name: Lehnert, Dennis
id: '90491'
last_name: Lehnert
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
citation:
ama: 'Chalicheemalapalli Jayasankar D, Gnaase S, Kaiser MA, Lehnert D, Tröster T.
Advancements in Hybrid Additive Manufacturing: Integrating SLM and LMD for High-Performance
Applications. Metals. 2024;14(7). doi:10.3390/met14070772'
apa: 'Chalicheemalapalli Jayasankar, D., Gnaase, S., Kaiser, M. A., Lehnert, D.,
& Tröster, T. (2024). Advancements in Hybrid Additive Manufacturing: Integrating
SLM and LMD for High-Performance Applications. Metals, 14(7), Article
772. https://doi.org/10.3390/met14070772'
bibtex: '@article{Chalicheemalapalli Jayasankar_Gnaase_Kaiser_Lehnert_Tröster_2024,
title={Advancements in Hybrid Additive Manufacturing: Integrating SLM and LMD
for High-Performance Applications}, volume={14}, DOI={10.3390/met14070772},
number={7772}, journal={Metals}, publisher={MDPI AG}, author={Chalicheemalapalli
Jayasankar, Deviprasad and Gnaase, Stefan and Kaiser, Maximilian Alexander and
Lehnert, Dennis and Tröster, Thomas}, year={2024} }'
chicago: 'Chalicheemalapalli Jayasankar, Deviprasad, Stefan Gnaase, Maximilian Alexander
Kaiser, Dennis Lehnert, and Thomas Tröster. “Advancements in Hybrid Additive Manufacturing:
Integrating SLM and LMD for High-Performance Applications.” Metals 14,
no. 7 (2024). https://doi.org/10.3390/met14070772.'
ieee: 'D. Chalicheemalapalli Jayasankar, S. Gnaase, M. A. Kaiser, D. Lehnert, and
T. Tröster, “Advancements in Hybrid Additive Manufacturing: Integrating SLM and
LMD for High-Performance Applications,” Metals, vol. 14, no. 7, Art. no.
772, 2024, doi: 10.3390/met14070772.'
mla: 'Chalicheemalapalli Jayasankar, Deviprasad, et al. “Advancements in Hybrid
Additive Manufacturing: Integrating SLM and LMD for High-Performance Applications.”
Metals, vol. 14, no. 7, 772, MDPI AG, 2024, doi:10.3390/met14070772.'
short: D. Chalicheemalapalli Jayasankar, S. Gnaase, M.A. Kaiser, D. Lehnert, T.
Tröster, Metals 14 (2024).
date_created: 2024-09-10T10:19:32Z
date_updated: 2026-03-20T08:44:23Z
department:
- _id: '9'
- _id: '321'
- _id: '149'
doi: 10.3390/met14070772
intvolume: ' 14'
issue: '7'
keyword:
- additive manufacturing (AM)
- selective laser melting (SLM)
- laser metal deposition (LMD)
- hybrid manufacturing
- process optimization
- 316L
- '1.2709'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.mdpi.com/2075-4701/14/7/772
oa: '1'
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: 'Advancements in Hybrid Additive Manufacturing: Integrating SLM and LMD for
High-Performance Applications'
type: journal_article
user_id: '49504'
volume: 14
year: '2024'
...
---
_id: '48082'
article_type: original
author:
- first_name: Keke
full_name: Yang, Keke
id: '65085'
last_name: Yang
orcid: 0000-0001-9201-9304
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
- first_name: 'Georg '
full_name: 'Seitz, Georg '
last_name: Seitz
- first_name: Max
full_name: Biegler, Max
last_name: Biegler
- first_name: Michael
full_name: Rethmeier, Michael
last_name: Rethmeier
citation:
ama: Yang K, Meschut G, Seitz G, Biegler M, Rethmeier M. The Identification of a
New Liquid Metal Embrittlement (LME) Type in Resistance Spot Welding of Advanced
High-Strength Steels on Reduced Flange Widths. Metals (Special Issue Embrittlement
Phenomena in Steel Metallurgy). 2023;13(10). doi:10.3390/met13101754
apa: Yang, K., Meschut, G., Seitz, G., Biegler, M., & Rethmeier, M. (2023).
The Identification of a New Liquid Metal Embrittlement (LME) Type in Resistance
Spot Welding of Advanced High-Strength Steels on Reduced Flange Widths. Metals
(Special Issue Embrittlement Phenomena in Steel Metallurgy), 13(10).
https://doi.org/10.3390/met13101754
bibtex: '@article{Yang_Meschut_Seitz_Biegler_Rethmeier_2023, title={The Identification
of a New Liquid Metal Embrittlement (LME) Type in Resistance Spot Welding of Advanced
High-Strength Steels on Reduced Flange Widths}, volume={13}, DOI={10.3390/met13101754},
number={10}, journal={Metals (Special Issue Embrittlement Phenomena in Steel Metallurgy)},
publisher={MDPI}, author={Yang, Keke and Meschut, Gerson and Seitz, Georg and
Biegler, Max and Rethmeier, Michael}, year={2023} }'
chicago: Yang, Keke, Gerson Meschut, Georg Seitz, Max Biegler, and Michael Rethmeier.
“The Identification of a New Liquid Metal Embrittlement (LME) Type in Resistance
Spot Welding of Advanced High-Strength Steels on Reduced Flange Widths.” Metals
(Special Issue Embrittlement Phenomena in Steel Metallurgy) 13, no. 10 (2023).
https://doi.org/10.3390/met13101754.
ieee: 'K. Yang, G. Meschut, G. Seitz, M. Biegler, and M. Rethmeier, “The Identification
of a New Liquid Metal Embrittlement (LME) Type in Resistance Spot Welding of Advanced
High-Strength Steels on Reduced Flange Widths,” Metals (Special Issue Embrittlement
Phenomena in Steel Metallurgy), vol. 13, no. 10, 2023, doi: 10.3390/met13101754.'
mla: Yang, Keke, et al. “The Identification of a New Liquid Metal Embrittlement
(LME) Type in Resistance Spot Welding of Advanced High-Strength Steels on Reduced
Flange Widths.” Metals (Special Issue Embrittlement Phenomena in Steel Metallurgy),
vol. 13, no. 10, MDPI, 2023, doi:10.3390/met13101754.
short: K. Yang, G. Meschut, G. Seitz, M. Biegler, M. Rethmeier, Metals (Special
Issue Embrittlement Phenomena in Steel Metallurgy) 13 (2023).
date_created: 2023-10-16T09:50:11Z
date_updated: 2024-03-18T12:33:26Z
ddc:
- '620'
department:
- _id: '157'
doi: 10.3390/met13101754
file:
- access_level: open_access
content_type: application/pdf
creator: kekeyang
date_created: 2023-10-16T09:50:04Z
date_updated: 2023-10-16T09:50:04Z
file_id: '48083'
file_name: metals-13-01754.pdf
file_size: 4650675
relation: main_file
file_date_updated: 2023-10-16T09:50:04Z
has_accepted_license: '1'
intvolume: ' 13'
issue: '10'
language:
- iso: eng
oa: '1'
publication: Metals (Special Issue Embrittlement Phenomena in Steel Metallurgy)
publication_identifier:
issn:
- 2075-4701
publication_status: published
publisher: MDPI
quality_controlled: '1'
status: public
title: The Identification of a New Liquid Metal Embrittlement (LME) Type in Resistance
Spot Welding of Advanced High-Strength Steels on Reduced Flange Widths
type: journal_article
user_id: '65085'
volume: 13
year: '2023'
...
---
_id: '34252'
abstract:
- lang: eng
text: Clinching is the manufacturing process of joining two or more metal sheets
under high plastic deformation by form and force closure without thermal support
and auxiliary parts. Clinch connections are applicable to difficult-to-join hybrid
material combinations, such as steel and aluminum. Therefore, this technology
is interesting for the application of AISI 304 components, as this material is
widely used as a highly formable sheet material. A characteristic feature of AISI
304 is its metastability, i.e., the face-centered cubic (fcc) γ-austenite can
transform into a significantly stronger body-centered cubic (bcc) α’-martensite
under plastic deformation. This work investigates the effect of heat treatment—a
process that involves the formation of an oxidation layer on the sheet surface—on
the forming process during joining and the resulting mechanical properties of
clinch joints made from AISI 304. For this purpose, different joints made from
non-heat treated and heat-treated sheets were examined using classical metallography
and advanced SEM techniques, accompanied by further investigations, such as hardness
and feritscope measurements. The shear tensile strength was determined, and the
fracture behavior of the samples was investigated. Clear influences of heat-treatment-induced
surface roughness on the joint geometry and strength were observed.
article_number: '1514'
author:
- first_name: André Till
full_name: Zeuner, André Till
last_name: Zeuner
- first_name: Lars
full_name: Ewenz, Lars
last_name: Ewenz
- first_name: Jan
full_name: Kalich, Jan
last_name: Kalich
- first_name: Sebastian
full_name: Schöne, Sebastian
last_name: Schöne
- first_name: Uwe
full_name: Füssel, Uwe
last_name: Füssel
- first_name: Martina
full_name: Zimmermann, Martina
last_name: Zimmermann
citation:
ama: Zeuner AT, Ewenz L, Kalich J, Schöne S, Füssel U, Zimmermann M. The Influence
of Heat Treatment on the Microstructure, Surface Roughness and Shear Tensile Strength
of AISI 304 Clinch Joints. Metals. 2022;12(9). doi:10.3390/met12091514
apa: Zeuner, A. T., Ewenz, L., Kalich, J., Schöne, S., Füssel, U., & Zimmermann,
M. (2022). The Influence of Heat Treatment on the Microstructure, Surface Roughness
and Shear Tensile Strength of AISI 304 Clinch Joints. Metals, 12(9),
Article 1514. https://doi.org/10.3390/met12091514
bibtex: '@article{Zeuner_Ewenz_Kalich_Schöne_Füssel_Zimmermann_2022, title={The
Influence of Heat Treatment on the Microstructure, Surface Roughness and Shear
Tensile Strength of AISI 304 Clinch Joints}, volume={12}, DOI={10.3390/met12091514},
number={91514}, journal={Metals}, publisher={MDPI AG}, author={Zeuner, André Till
and Ewenz, Lars and Kalich, Jan and Schöne, Sebastian and Füssel, Uwe and Zimmermann,
Martina}, year={2022} }'
chicago: Zeuner, André Till, Lars Ewenz, Jan Kalich, Sebastian Schöne, Uwe Füssel,
and Martina Zimmermann. “The Influence of Heat Treatment on the Microstructure,
Surface Roughness and Shear Tensile Strength of AISI 304 Clinch Joints.” Metals
12, no. 9 (2022). https://doi.org/10.3390/met12091514.
ieee: 'A. T. Zeuner, L. Ewenz, J. Kalich, S. Schöne, U. Füssel, and M. Zimmermann,
“The Influence of Heat Treatment on the Microstructure, Surface Roughness and
Shear Tensile Strength of AISI 304 Clinch Joints,” Metals, vol. 12, no.
9, Art. no. 1514, 2022, doi: 10.3390/met12091514.'
mla: Zeuner, André Till, et al. “The Influence of Heat Treatment on the Microstructure,
Surface Roughness and Shear Tensile Strength of AISI 304 Clinch Joints.” Metals,
vol. 12, no. 9, 1514, MDPI AG, 2022, doi:10.3390/met12091514.
short: A.T. Zeuner, L. Ewenz, J. Kalich, S. Schöne, U. Füssel, M. Zimmermann, Metals
12 (2022).
date_created: 2022-12-06T19:25:49Z
date_updated: 2023-01-02T11:04:26Z
department:
- _id: '630'
doi: 10.3390/met12091514
intvolume: ' 12'
issue: '9'
keyword:
- General Materials Science
- Metals and Alloys
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.mdpi.com/2075-4701/12/9/1514
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: '138'
name: 'TRR 285 – A04: TRR 285 - Subproject A04'
- _id: '132'
name: 'TRR 285 - B: TRR 285 - Project Area B'
- _id: '141'
name: 'TRR 285 – B02: TRR 285 - Subproject B02'
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
publisher: MDPI AG
status: public
title: The Influence of Heat Treatment on the Microstructure, Surface Roughness and
Shear Tensile Strength of AISI 304 Clinch Joints
type: journal_article
user_id: '14931'
volume: 12
year: '2022'
...
---
_id: '34251'
abstract:
- lang: eng
text: Joining by forming operations presents powerful and complex joining techniques.
Clinching is a well-known joining process for use in sheet metalworking. Currently,
clinched joints are focusing on mechanically enhanced connections. Additionally,
the demand for integrating electrical requirements to transmit electrical currents
will be increased in the future. This integration is particularly important, for
instance, in the e-mobility sector. It enables connecting battery cells with electrical
joints of aluminum and copper. Systematic use of the process-specific advantages
of this joining method opens up the possibility to find and create electrically
optimized connections. The optimization for the transmission of electrical currents
will be demonstrated for clinched joints by adapting the tool geometry and the
clinched joint design. Based on a comparison of the electrical joint resistance,
the limit use temperature is defined for the joining materials used based on the
microstructural condition and the aging condition due to artificial aging. As
a result of the investigations carried out, reliable current transmission at a
constant conductor temperature of up to 120 °C can be achieved for clinched copper–copper
joints. In the case of pure aluminum joints and mixed joints of aluminum and copper,
long-term stable current transmission can be ensured up to a conductor temperature
of 100 °C.
article_number: '1651'
author:
- first_name: Jan
full_name: Kalich, Jan
last_name: Kalich
- first_name: Marcus
full_name: Matzke, Marcus
last_name: Matzke
- first_name: Wolfgang
full_name: Pfeiffer, Wolfgang
last_name: Pfeiffer
- first_name: Stephan
full_name: Schlegel, Stephan
last_name: Schlegel
- first_name: Ludwig
full_name: Kornhuber, Ludwig
last_name: Kornhuber
- first_name: Uwe
full_name: Füssel, Uwe
last_name: Füssel
citation:
ama: Kalich J, Matzke M, Pfeiffer W, Schlegel S, Kornhuber L, Füssel U. Long-Term
Behavior of Clinched Electrical Contacts. Metals. 2022;12(10). doi:10.3390/met12101651
apa: Kalich, J., Matzke, M., Pfeiffer, W., Schlegel, S., Kornhuber, L., & Füssel,
U. (2022). Long-Term Behavior of Clinched Electrical Contacts. Metals,
12(10), Article 1651. https://doi.org/10.3390/met12101651
bibtex: '@article{Kalich_Matzke_Pfeiffer_Schlegel_Kornhuber_Füssel_2022, title={Long-Term
Behavior of Clinched Electrical Contacts}, volume={12}, DOI={10.3390/met12101651},
number={101651}, journal={Metals}, publisher={MDPI AG}, author={Kalich, Jan and
Matzke, Marcus and Pfeiffer, Wolfgang and Schlegel, Stephan and Kornhuber, Ludwig
and Füssel, Uwe}, year={2022} }'
chicago: Kalich, Jan, Marcus Matzke, Wolfgang Pfeiffer, Stephan Schlegel, Ludwig
Kornhuber, and Uwe Füssel. “Long-Term Behavior of Clinched Electrical Contacts.”
Metals 12, no. 10 (2022). https://doi.org/10.3390/met12101651.
ieee: 'J. Kalich, M. Matzke, W. Pfeiffer, S. Schlegel, L. Kornhuber, and U. Füssel,
“Long-Term Behavior of Clinched Electrical Contacts,” Metals, vol. 12,
no. 10, Art. no. 1651, 2022, doi: 10.3390/met12101651.'
mla: Kalich, Jan, et al. “Long-Term Behavior of Clinched Electrical Contacts.” Metals,
vol. 12, no. 10, 1651, MDPI AG, 2022, doi:10.3390/met12101651.
short: J. Kalich, M. Matzke, W. Pfeiffer, S. Schlegel, L. Kornhuber, U. Füssel,
Metals 12 (2022).
date_created: 2022-12-06T19:20:46Z
date_updated: 2023-01-02T11:06:35Z
department:
- _id: '630'
doi: 10.3390/met12101651
intvolume: ' 12'
issue: '10'
keyword:
- General Materials Science
- Metals and Alloys
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.mdpi.com/2075-4701/12/10/1651
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: '138'
name: 'TRR 285 – A04: TRR 285 - Subproject A04'
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
publisher: MDPI AG
status: public
title: Long-Term Behavior of Clinched Electrical Contacts
type: journal_article
user_id: '14931'
volume: 12
year: '2022'
...
---
_id: '31360'
abstract:
- lang: eng
text: The adaptive joining process employing friction-spun joint connectors
(FSJC) is a promising method for the realization of adaptable joints and thus
for lightweight construction. In addition to experimental investigations, numerical
studies are indispensable tools for its development. Therefore, this paper includes
an analysis of boundary conditions for the spatial discretization and mesh modeling
techniques, the material modeling, the contact and friction modeling, and the
thermal boundary conditions for the finite element (FE) modeling of this joining
process. For these investigations, two FE models corresponding to the two process
steps were set up and compared with the two related processes of friction stir
welding and friction drilling. Regarding the spatial discretization, the Lagrangian
approach is not sufficient to represent the deformation that occurs. The Johnson-Cook
model is well suited as a material model. The modeling of the contact detection
and friction are important research subjects. Coulomb’s law of friction is not
adequate to account for the complex friction phenomena of the adaptive joining
process. The thermal boundary conditions play a decisive role in heat generation
and thus in the material flow of the process. It is advisable to use temperature-dependent
parameters and to investigate in detail the influence of radiation in the entire
process.
article_number: '869'
author:
- first_name: Annika
full_name: Oesterwinter, Annika
id: '44917'
last_name: Oesterwinter
- first_name: Christian
full_name: Wischer, Christian
id: '72219'
last_name: Wischer
- first_name: Werner
full_name: Homberg, Werner
last_name: Homberg
citation:
ama: Oesterwinter A, Wischer C, Homberg W. Identification of Requirements for FE
Modeling of an Adaptive Joining Technology Employing Friction-Spun Joint Connectors
(FSJC). Metals. 2022;12(5). doi:10.3390/met12050869
apa: Oesterwinter, A., Wischer, C., & Homberg, W. (2022). Identification of
Requirements for FE Modeling of an Adaptive Joining Technology Employing Friction-Spun
Joint Connectors (FSJC). Metals, 12(5), Article 869. https://doi.org/10.3390/met12050869
bibtex: '@article{Oesterwinter_Wischer_Homberg_2022, title={Identification of Requirements
for FE Modeling of an Adaptive Joining Technology Employing Friction-Spun Joint
Connectors (FSJC)}, volume={12}, DOI={10.3390/met12050869},
number={5869}, journal={Metals}, publisher={MDPI AG}, author={Oesterwinter, Annika
and Wischer, Christian and Homberg, Werner}, year={2022} }'
chicago: Oesterwinter, Annika, Christian Wischer, and Werner Homberg. “Identification
of Requirements for FE Modeling of an Adaptive Joining Technology Employing Friction-Spun
Joint Connectors (FSJC).” Metals 12, no. 5 (2022). https://doi.org/10.3390/met12050869.
ieee: 'A. Oesterwinter, C. Wischer, and W. Homberg, “Identification of Requirements
for FE Modeling of an Adaptive Joining Technology Employing Friction-Spun Joint
Connectors (FSJC),” Metals, vol. 12, no. 5, Art. no. 869, 2022, doi: 10.3390/met12050869.'
mla: Oesterwinter, Annika, et al. “Identification of Requirements for FE Modeling
of an Adaptive Joining Technology Employing Friction-Spun Joint Connectors (FSJC).”
Metals, vol. 12, no. 5, 869, MDPI AG, 2022, doi:10.3390/met12050869.
short: A. Oesterwinter, C. Wischer, W. Homberg, Metals 12 (2022).
date_created: 2022-05-21T17:27:16Z
date_updated: 2023-04-27T09:39:39Z
department:
- _id: '9'
- _id: '156'
- _id: '630'
doi: 10.3390/met12050869
intvolume: ' 12'
issue: '5'
keyword:
- General Materials Science
- Metals and Alloys
language:
- iso: eng
project:
- _id: '133'
name: 'TRR 285 - C: TRR 285 - Project Area C'
- _id: '147'
name: 'TRR 285 – C03: TRR 285 - Subproject C03'
- _id: '130'
grant_number: '418701707'
name: 'TRR 285: TRR 285'
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Identification of Requirements for FE Modeling of an Adaptive Joining Technology
Employing Friction-Spun Joint Connectors (FSJC)
type: journal_article
user_id: '83141'
volume: 12
year: '2022'
...
---
_id: '30885'
abstract:
- lang: eng
text: High-speed forming processes such as electromagnetic forming (EMF) and electrohydraulic
forming (EHF) have a high potential for producing lightweight components with
complex geometries, but the forming zone is usually limited to a small size for
equipment-related reasons. Incremental strategies overcome this limit by using
a sequence of local deformations to form larger component areas gradually. Hence,
the technological potential of high-speed forming can be exploited for large-area
components too. The target-oriented process design of such incremental forming
operations requires a deep understanding of the underlying electromagnetic and
electrohydraulic forming processes. This article therefore analyzes and compares
the influence of fundamental process parameters on the acting loads, the resulting
course of deformation, and the forming result for both technologies via experimental
and numerical investigations. Specifically, it is shown that for the EHF process
considered, the electrode distance and the discharge energy have a significant
influence on the resulting forming depth. In the EHF process, the largest forming
depth is achieved directly below the electrodes, while the pressure distribution
in the EMF depends on the fieldshaper used. The energy requirement for the EHF
process is comparatively low, while significantly higher forming speeds are achieved
with the EMF process.
author:
- first_name: Thomas
full_name: Heggemann, Thomas
id: '9360'
last_name: Heggemann
- first_name: Verena
full_name: Psyk, Verena
last_name: Psyk
- first_name: Annika
full_name: Oesterwinter, Annika
id: '44917'
last_name: Oesterwinter
- first_name: Maik
full_name: Linnemann, Maik
last_name: Linnemann
- first_name: Verena
full_name: Kräusel, Verena
last_name: Kräusel
- first_name: Werner
full_name: Homberg, Werner
last_name: Homberg
citation:
ama: Heggemann T, Psyk V, Oesterwinter A, Linnemann M, Kräusel V, Homberg W. Comparative
Analysis of Electrohydraulic and Electromagnetic Sheet Metal Forming against the
Background of the Application as an Incremental Processing Technology. Metals.
2022;12(4). doi:10.3390/met12040660
apa: Heggemann, T., Psyk, V., Oesterwinter, A., Linnemann, M., Kräusel, V., &
Homberg, W. (2022). Comparative Analysis of Electrohydraulic and Electromagnetic
Sheet Metal Forming against the Background of the Application as an Incremental
Processing Technology. Metals, 12(4). https://doi.org/10.3390/met12040660
bibtex: '@article{Heggemann_Psyk_Oesterwinter_Linnemann_Kräusel_Homberg_2022, title={Comparative
Analysis of Electrohydraulic and Electromagnetic Sheet Metal Forming against the
Background of the Application as an Incremental Processing Technology}, volume={12},
DOI={10.3390/met12040660}, number={4},
journal={Metals}, author={Heggemann, Thomas and Psyk, Verena and Oesterwinter,
Annika and Linnemann, Maik and Kräusel, Verena and Homberg, Werner}, year={2022}
}'
chicago: Heggemann, Thomas, Verena Psyk, Annika Oesterwinter, Maik Linnemann, Verena
Kräusel, and Werner Homberg. “Comparative Analysis of Electrohydraulic and Electromagnetic
Sheet Metal Forming against the Background of the Application as an Incremental
Processing Technology.” Metals 12, no. 4 (2022). https://doi.org/10.3390/met12040660.
ieee: 'T. Heggemann, V. Psyk, A. Oesterwinter, M. Linnemann, V. Kräusel, and W.
Homberg, “Comparative Analysis of Electrohydraulic and Electromagnetic Sheet Metal
Forming against the Background of the Application as an Incremental Processing
Technology,” Metals, vol. 12, no. 4, 2022, doi: 10.3390/met12040660.'
mla: Heggemann, Thomas, et al. “Comparative Analysis of Electrohydraulic and Electromagnetic
Sheet Metal Forming against the Background of the Application as an Incremental
Processing Technology.” Metals, vol. 12, no. 4, 2022, doi:10.3390/met12040660.
short: T. Heggemann, V. Psyk, A. Oesterwinter, M. Linnemann, V. Kräusel, W. Homberg,
Metals 12 (2022).
date_created: 2022-04-13T09:06:11Z
date_updated: 2023-04-27T09:39:58Z
department:
- _id: '9'
- _id: '156'
doi: 10.3390/met12040660
intvolume: ' 12'
issue: '4'
language:
- iso: eng
publication: Metals
publication_identifier:
issn:
- 2075-4701
quality_controlled: '1'
status: public
title: Comparative Analysis of Electrohydraulic and Electromagnetic Sheet Metal Forming
against the Background of the Application as an Incremental Processing Technology
type: journal_article
user_id: '83141'
volume: 12
year: '2022'
...
---
_id: '29357'
abstract:
- lang: eng
text: Friction-spinning as an innovative incremental forming process enables
high degrees of deformation in the field of tube and sheet metal forming due to
self-induced heat generation in the forming area. The complex thermomechanical
conditions generate non-uniform residual stress distributions. In order to specifically
adjust these residual stress distributions, the influence of different process
parameters on residual stress distributions in flanges formed by the friction-spinning
of tubes is investigated using the design of experiments (DoE) method. The feed
rate with an effect of −156 MPa/mm is the dominating control parameter for residual
stress depth distribution in steel flange forming, whereas the rotation speed
of the workpiece with an effect of 18 MPa/mm dominates the gradient of residual
stress generation in the aluminium flange-forming process. A run-to-run predictive
control system for the specific adjustment of residual stress distributions is
proposed and validated. The predictive model provides an initial solution in the
form of a parameter set, and the controlled feedback iteratively approaches the
target value with new parameter sets recalculated on the basis of the deviation
of the previous run. Residual stress measurements are carried out using the hole-drilling
method and X-ray diffraction by the cosα-method.
article_number: '158'
author:
- first_name: Frederik
full_name: Dahms, Frederik
id: '64977'
last_name: Dahms
- first_name: Werner
full_name: Homberg, Werner
id: '233'
last_name: Homberg
citation:
ama: 'Dahms F, Homberg W. Manufacture of Defined Residual Stress Distributions in
the Friction-Spinning Process: Investigations and Run-to-Run Predictive Control.
Metals. 2022;12(1). doi:10.3390/met12010158'
apa: 'Dahms, F., & Homberg, W. (2022). Manufacture of Defined Residual Stress
Distributions in the Friction-Spinning Process: Investigations and Run-to-Run
Predictive Control. Metals, 12(1), Article 158. https://doi.org/10.3390/met12010158'
bibtex: '@article{Dahms_Homberg_2022, title={Manufacture of Defined Residual Stress
Distributions in the Friction-Spinning Process: Investigations and Run-to-Run
Predictive Control}, volume={12}, DOI={10.3390/met12010158},
number={1158}, journal={Metals}, publisher={MDPI AG}, author={Dahms, Frederik
and Homberg, Werner}, year={2022} }'
chicago: 'Dahms, Frederik, and Werner Homberg. “Manufacture of Defined Residual
Stress Distributions in the Friction-Spinning Process: Investigations and Run-to-Run
Predictive Control.” Metals 12, no. 1 (2022). https://doi.org/10.3390/met12010158.'
ieee: 'F. Dahms and W. Homberg, “Manufacture of Defined Residual Stress Distributions
in the Friction-Spinning Process: Investigations and Run-to-Run Predictive Control,”
Metals, vol. 12, no. 1, Art. no. 158, 2022, doi: 10.3390/met12010158.'
mla: 'Dahms, Frederik, and Werner Homberg. “Manufacture of Defined Residual Stress
Distributions in the Friction-Spinning Process: Investigations and Run-to-Run
Predictive Control.” Metals, vol. 12, no. 1, 158, MDPI AG, 2022, doi:10.3390/met12010158.'
short: F. Dahms, W. Homberg, Metals 12 (2022).
date_created: 2022-01-17T08:21:04Z
date_updated: 2023-04-27T10:30:32Z
department:
- _id: '156'
doi: 10.3390/met12010158
intvolume: ' 12'
issue: '1'
keyword:
- General Materials Science
- Metals and Alloys
language:
- iso: eng
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: 'Manufacture of Defined Residual Stress Distributions in the Friction-Spinning
Process: Investigations and Run-to-Run Predictive Control'
type: journal_article
user_id: '64977'
volume: 12
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: '24131'
abstract:
- lang: eng
text: Glass/carbon fiber reinforced plastic (GFRP/CFRP) and hybrid components
have attracted increasing attention in lightweight applications. However, residual
stresses induced in the manufacturing process of these components can result in
warpage and, eventually, negatively affect the mechanical performance of the composite
structures. In the present work, GFRP, CFRP, GFRP/steel and CFRP/steel hybrid
components were manufactured through the prepreg-press-technology always employing
the same process parameters. The residual stresses of these components were measured
through the hole drilling method (HDM), based on an adequate formalism to evaluate
the residual stresses for orthotropic materials including the calculation of the
calibration coefficients via finite element analysis (FEA). In FEA, the real material
lay-up and mechanical properties of the samples were considered. The warpage induced
by residual stresses was measured after the samples were removed from the tool.
The measured residual stresses and warpage of four different types of samples
were compared and results were analyzed in depth. The results obtained can be
extended to other hybrid materials and even could be used for designing multi-stable
laminates for application in adaptive structures. Moreover, the effects of the
drilling process parameters of HDM, e.g., the drilling speed, the drilling increment
and the zero-depth setting, on the resulting residual stresses of GFRP were investigated.
The reliability of residual stress measurements in GFRP using HDM was validated
through mechanical bending tests. The conclusions concerning the choice of optimal
drilling parameters for GFRP could be directly applied for other types of samples
considered in the present work.
article_number: '335'
author:
- first_name: Tao
full_name: Wu, Tao
last_name: Wu
- 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: Thomas
full_name: Niendorf, Thomas
last_name: Niendorf
citation:
ama: Wu T, Tinkloh SR, Tröster T, Zinn W, Niendorf T. Measurement and Analysis of
Residual Stresses and Warpage in Fiber Reinforced Plastic and Hybrid Components.
Metals. Published online 2021. doi:10.3390/met11020335
apa: Wu, T., Tinkloh, S. R., Tröster, T., Zinn, W., & Niendorf, T. (2021). Measurement
and Analysis of Residual Stresses and Warpage in Fiber Reinforced Plastic and
Hybrid Components. Metals, Article 335. https://doi.org/10.3390/met11020335
bibtex: '@article{Wu_Tinkloh_Tröster_Zinn_Niendorf_2021, title={Measurement and
Analysis of Residual Stresses and Warpage in Fiber Reinforced Plastic and Hybrid
Components}, DOI={10.3390/met11020335},
number={335}, journal={Metals}, author={Wu, Tao and Tinkloh, Steffen Rainer and
Tröster, Thomas and Zinn, Wolfgang and Niendorf, Thomas}, year={2021} }'
chicago: Wu, Tao, Steffen Rainer Tinkloh, Thomas Tröster, Wolfgang Zinn, and Thomas
Niendorf. “Measurement and Analysis of Residual Stresses and Warpage in Fiber
Reinforced Plastic and Hybrid Components.” Metals, 2021. https://doi.org/10.3390/met11020335.
ieee: 'T. Wu, S. R. Tinkloh, T. Tröster, W. Zinn, and T. Niendorf, “Measurement
and Analysis of Residual Stresses and Warpage in Fiber Reinforced Plastic and
Hybrid Components,” Metals, Art. no. 335, 2021, doi: 10.3390/met11020335.'
mla: Wu, Tao, et al. “Measurement and Analysis of Residual Stresses and Warpage
in Fiber Reinforced Plastic and Hybrid Components.” Metals, 335, 2021,
doi:10.3390/met11020335.
short: T. Wu, S.R. Tinkloh, T. Tröster, W. Zinn, T. Niendorf, Metals (2021).
date_created: 2021-09-10T08:25:01Z
date_updated: 2022-04-26T06:34:21Z
department:
- _id: '9'
- _id: '321'
- _id: '149'
doi: 10.3390/met11020335
language:
- iso: eng
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
quality_controlled: '1'
status: public
title: Measurement and Analysis of Residual Stresses and Warpage in Fiber Reinforced
Plastic and Hybrid Components
type: journal_article
user_id: '72722'
year: '2021'
...
---
_id: '21064'
article_number: '156'
author:
- first_name: Steffen Rainer
full_name: Tinkloh, Steffen Rainer
id: '72722'
last_name: Tinkloh
- first_name: Tao
full_name: Wu, Tao
last_name: Wu
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
- first_name: Thomas
full_name: Niendorf, Thomas
last_name: Niendorf
citation:
ama: 'Tinkloh SR, Wu T, Tröster T, Niendorf T. The Effect of Fiber Waviness on the
Residual Stress State and Its Prediction by the Hole Drilling Method in Fiber
Metal Laminates: A Global-Local Finite Element Analysis. Metals. Published
online 2021. doi:10.3390/met11010156'
apa: 'Tinkloh, S. R., Wu, T., Tröster, T., & Niendorf, T. (2021). The Effect
of Fiber Waviness on the Residual Stress State and Its Prediction by the Hole
Drilling Method in Fiber Metal Laminates: A Global-Local Finite Element Analysis.
Metals, Article 156. https://doi.org/10.3390/met11010156'
bibtex: '@article{Tinkloh_Wu_Tröster_Niendorf_2021, title={The Effect of Fiber Waviness
on the Residual Stress State and Its Prediction by the Hole Drilling Method in
Fiber Metal Laminates: A Global-Local Finite Element Analysis}, DOI={10.3390/met11010156},
number={156}, journal={Metals}, author={Tinkloh, Steffen Rainer and Wu, Tao and
Tröster, Thomas and Niendorf, Thomas}, year={2021} }'
chicago: 'Tinkloh, Steffen Rainer, Tao Wu, Thomas Tröster, and Thomas Niendorf.
“The Effect of Fiber Waviness on the Residual Stress State and Its Prediction
by the Hole Drilling Method in Fiber Metal Laminates: A Global-Local Finite Element
Analysis.” Metals, 2021. https://doi.org/10.3390/met11010156.'
ieee: 'S. R. Tinkloh, T. Wu, T. Tröster, and T. Niendorf, “The Effect of Fiber Waviness
on the Residual Stress State and Its Prediction by the Hole Drilling Method in
Fiber Metal Laminates: A Global-Local Finite Element Analysis,” Metals,
Art. no. 156, 2021, doi: 10.3390/met11010156.'
mla: 'Tinkloh, Steffen Rainer, et al. “The Effect of Fiber Waviness on the Residual
Stress State and Its Prediction by the Hole Drilling Method in Fiber Metal Laminates:
A Global-Local Finite Element Analysis.” Metals, 156, 2021, doi:10.3390/met11010156.'
short: S.R. Tinkloh, T. Wu, T. Tröster, T. Niendorf, Metals (2021).
date_created: 2021-01-24T16:12:14Z
date_updated: 2022-04-26T06:34:47Z
department:
- _id: '149'
- _id: '9'
- _id: '321'
doi: 10.3390/met11010156
language:
- iso: eng
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
quality_controlled: '1'
status: public
title: 'The Effect of Fiber Waviness on the Residual Stress State and Its Prediction
by the Hole Drilling Method in Fiber Metal Laminates: A Global-Local Finite Element
Analysis'
type: journal_article
user_id: '72722'
year: '2021'
...
---
_id: '24535'
abstract:
- lang: eng
text: Implementing the concept of mixed construction in modern automotive
engineering requires the joining of sheet metal or extruded profiles with cast
components made from different materials. As weight reduction is desired, these
cast components are usually made from high-strength aluminium alloys of the Al-Si
(Mn, Mg) system, which have limited weldability. The mechanical joinability of
the cast components depends on their ductility, which is influenced by the microstructure.
High-strength cast aluminium alloys have relatively low ductility, which leads
to cracking of the joints. This limits the range of applications for cast aluminium
alloys. In this study, an aluminium alloy of the Al-Si system AlSi9 is used to
investigate relationships between solidification conditions during the sand casting
process, microstructure, mechanical properties, and joinability. The demonstrator
is a stepped plate with a minimum thickness of 2.0 mm and a maximum thickness
of 4.0 mm, whereas the thickness difference between neighbour steps amounts to
0.5 mm. During casting trials, the solidification rates for different plate steps
were measured. The microscopic investigations reveal a correlation between solidification
rates and microstructure parameters such as secondary dendrite arm spacing. Furthermore,
mechanical properties and the mechanical joinability are investigated.
article_number: '1304'
author:
- first_name: Moritz
full_name: Neuser, Moritz
id: '32340'
last_name: Neuser
- first_name: Olexandr
full_name: Grydin, Olexandr
id: '43822'
last_name: Grydin
- first_name: Anatolii
full_name: Andreiev, Anatolii
id: '50215'
last_name: Andreiev
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: Neuser M, Grydin O, Andreiev A, Schaper M. Effect of Solidification Rates at
Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy. Metals.
Published online 2021. doi:10.3390/met11081304
apa: Neuser, M., Grydin, O., Andreiev, A., & Schaper, M. (2021). Effect of Solidification
Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy.
Metals, Article 1304. https://doi.org/10.3390/met11081304
bibtex: '@article{Neuser_Grydin_Andreiev_Schaper_2021, title={Effect of Solidification
Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy},
DOI={10.3390/met11081304}, number={1304},
journal={Metals}, author={Neuser, Moritz and Grydin, Olexandr and Andreiev, Anatolii
and Schaper, Mirko}, year={2021} }'
chicago: Neuser, Moritz, Olexandr Grydin, Anatolii Andreiev, and Mirko Schaper.
“Effect of Solidification Rates at Sand Casting on the Mechanical Joinability
of a Cast Aluminium Alloy.” Metals, 2021. https://doi.org/10.3390/met11081304.
ieee: 'M. Neuser, O. Grydin, A. Andreiev, and M. Schaper, “Effect of Solidification
Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy,”
Metals, Art. no. 1304, 2021, doi: 10.3390/met11081304.'
mla: Neuser, Moritz, et al. “Effect of Solidification Rates at Sand Casting on the
Mechanical Joinability of a Cast Aluminium Alloy.” Metals, 1304, 2021,
doi:10.3390/met11081304.
short: M. Neuser, O. Grydin, A. Andreiev, M. Schaper, Metals (2021).
date_created: 2021-09-15T18:20:14Z
date_updated: 2024-03-14T15:24:24Z
department:
- _id: '9'
- _id: '158'
- _id: '630'
doi: 10.3390/met11081304
language:
- iso: eng
project:
- _id: '130'
grant_number: '418701707'
name: 'TRR 285: TRR 285'
- _id: '131'
name: 'TRR 285 - A: TRR 285 - Project Area A'
- _id: '136'
name: 'TRR 285 – A02: TRR 285 - Subproject A02'
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
quality_controlled: '1'
status: public
title: Effect of Solidification Rates at Sand Casting on the Mechanical Joinability
of a Cast Aluminium Alloy
type: journal_article
user_id: '32340'
year: '2021'
...
---
_id: '21635'
abstract:
- lang: eng
text: Modern forming processes often allow today the efficient production
of complex parts. In order to increase the sustainability of forming processes
it would be favorable if the forming of workpieces becomes possible using production
waste. At the Chair of Forming and Machining Technology of the Paderborn University
(LUF) research is presently conducted with the overall goal to produce workpieces
directly from secondary aluminum (e.g., powder and chips). Therefore, friction-based
forming processes like friction spinning (or cognate processes) are used due to
their high efficiency. As a pre-step, the production of semi-finished parts was
the subject of accorded research work at the LUF. Therefore, a friction-based
hot extrusion process was used for the full recycling or rework of aluminum chips
into profiles. Investigations of the recycled semi-finished products show that
they are comparable to conventionally produced semi-finished products in terms
of dimensional stability and shape accuracy. An analysis of the mechanical properties
of hardness and tensile strength shows that a final product with good and homogeneously
distributed properties can be produced. Furthermore, significant correlations
to the friction spinning process could be found that are useful for the above-mentioned
direct part production from secondary aluminum.
article_number: '663'
author:
- first_name: Thomas
full_name: Borgert, Thomas
id: '83141'
last_name: Borgert
- first_name: Werner
full_name: Homberg, Werner
last_name: Homberg
citation:
ama: Borgert T, Homberg W. Friction-Induced Recycling Process for User-Specific
Semi-Finished Product Production. Metals. Published online 2021. doi:10.3390/met11040663
apa: Borgert, T., & Homberg, W. (2021). Friction-Induced Recycling Process for
User-Specific Semi-Finished Product Production. Metals, Article 663. https://doi.org/10.3390/met11040663
bibtex: '@article{Borgert_Homberg_2021, title={Friction-Induced Recycling Process
for User-Specific Semi-Finished Product Production}, DOI={10.3390/met11040663},
number={663}, journal={Metals}, author={Borgert, Thomas and Homberg, Werner},
year={2021} }'
chicago: Borgert, Thomas, and Werner Homberg. “Friction-Induced Recycling Process
for User-Specific Semi-Finished Product Production.” Metals, 2021. https://doi.org/10.3390/met11040663.
ieee: 'T. Borgert and W. Homberg, “Friction-Induced Recycling Process for User-Specific
Semi-Finished Product Production,” Metals, Art. no. 663, 2021, doi: 10.3390/met11040663.'
mla: Borgert, Thomas, and Werner Homberg. “Friction-Induced Recycling Process for
User-Specific Semi-Finished Product Production.” Metals, 663, 2021, doi:10.3390/met11040663.
short: T. Borgert, W. Homberg, Metals (2021).
date_created: 2021-04-20T05:02:14Z
date_updated: 2023-04-26T13:25:52Z
department:
- _id: '156'
doi: 10.3390/met11040663
language:
- iso: eng
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
quality_controlled: '1'
status: public
title: Friction-Induced Recycling Process for User-Specific Semi-Finished Product
Production
type: journal_article
user_id: '83141'
year: '2021'
...
---
_id: '23913'
abstract:
- lang: eng
text: Implementing the concept of mixed construction in modern automotive
engineering requires the joining of sheet metal or extruded profiles with cast
components made from different materials. As weight reduction is desired, these
cast components are usually made from high-strength aluminium alloys of the Al-Si
(Mn, Mg) system, which have limited weldability. The mechanical joinability of
the cast components depends on their ductility, which is influenced by the microstructure.
High-strength cast aluminium alloys have relatively low ductility, which leads
to cracking of the joints. This limits the range of applications for cast aluminium
alloys. In this study, an aluminium alloy of the Al-Si system AlSi9 is used to
investigate relationships between solidification conditions during the sand casting
process, microstructure, mechanical properties, and joinability. The demonstrator
is a stepped plate with a minimum thickness of 2.0 mm and a maximum thickness
of 4.0 mm, whereas the thickness difference between neighbour steps amounts to
0.5 mm. During casting trials, the solidification rates for different plate steps
were measured. The microscopic investigations reveal a correlation between solidification
rates and microstructure parameters such as secondary dendrite arm spacing. Furthermore,
mechanical properties and the mechanical joinability are investigated.
article_number: '1304'
article_type: original
author:
- first_name: Moritz
full_name: Neuser, Moritz
last_name: Neuser
- first_name: Olexandr
full_name: Grydin, Olexandr
id: '43822'
last_name: Grydin
- first_name: Anatolii
full_name: Andreiev, Anatolii
id: '50215'
last_name: Andreiev
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: Neuser M, Grydin O, Andreiev A, Schaper M. Effect of Solidification Rates at
Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy. Metals.
Published online 2021. doi:10.3390/met11081304
apa: Neuser, M., Grydin, O., Andreiev, A., & Schaper, M. (2021). Effect of Solidification
Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy.
Metals, Article 1304. https://doi.org/10.3390/met11081304
bibtex: '@article{Neuser_Grydin_Andreiev_Schaper_2021, title={Effect of Solidification
Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy},
DOI={10.3390/met11081304}, number={1304},
journal={Metals}, author={Neuser, Moritz and Grydin, Olexandr and Andreiev, Anatolii
and Schaper, Mirko}, year={2021} }'
chicago: Neuser, Moritz, Olexandr Grydin, Anatolii Andreiev, and Mirko Schaper.
“Effect of Solidification Rates at Sand Casting on the Mechanical Joinability
of a Cast Aluminium Alloy.” Metals, 2021. https://doi.org/10.3390/met11081304.
ieee: 'M. Neuser, O. Grydin, A. Andreiev, and M. Schaper, “Effect of Solidification
Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy,”
Metals, Art. no. 1304, 2021, doi: 10.3390/met11081304.'
mla: Neuser, Moritz, et al. “Effect of Solidification Rates at Sand Casting on the
Mechanical Joinability of a Cast Aluminium Alloy.” Metals, 1304, 2021,
doi:10.3390/met11081304.
short: M. Neuser, O. Grydin, A. Andreiev, M. Schaper, Metals (2021).
date_created: 2021-09-08T07:48:28Z
date_updated: 2023-06-01T14:40:09Z
department:
- _id: '321'
doi: 10.3390/met11081304
language:
- iso: eng
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
quality_controlled: '1'
status: public
title: Effect of Solidification Rates at Sand Casting on the Mechanical Joinability
of a Cast Aluminium Alloy
type: journal_article
user_id: '43720'
year: '2021'
...
---
_id: '24573'
abstract:
- lang: eng
text: Al-Li based alloys are attractive materials for the aerospace industry.
The twin-roll casting of such materials could provide properties not achievable
by conventional direct-chill casting and downstream processing methods due to
significantly higher solidification rates. An Al-Li-Cu-Mg-Zr alloy was twin-roll
cast with the same alloy containing a small addition of Sc. The microstructure
of as-cast materials and the influence of Sc on the behavior of the alloy at elevated
temperatures were studied by means of light and electron microscopy and by resistivity
measurements. A fine-grained structure was formed during twin-roll casting, but
several surface and internal defects were found on the strips, which should be
suppressed by a further adjustment of the casting conditions. The addition of
Sc had a positive effect on grain size uniformity and microstructure stabilization
at elevated temperatures, as shown by the precipitation of a fine dispersion of
coherent Sc- and Zr-containing precipitates.
article_number: '987'
article_type: original
author:
- first_name: Olexandr
full_name: Grydin, Olexandr
id: '43822'
last_name: Grydin
- first_name: Mykhailo
full_name: Stolbchenko, Mykhailo
last_name: Stolbchenko
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
- first_name: Sára
full_name: Belejová, Sára
last_name: Belejová
- first_name: Rostislav
full_name: Králík, Rostislav
last_name: Králík
- first_name: Lucia
full_name: Bajtošová, Lucia
last_name: Bajtošová
- first_name: Barbora
full_name: Křivská, Barbora
last_name: Křivská
- first_name: Michal
full_name: Hájek, Michal
last_name: Hájek
- first_name: Miroslav
full_name: Cieslar, Miroslav
last_name: Cieslar
citation:
ama: Grydin O, Stolbchenko M, Schaper M, et al. New Twin-Roll Cast Al-Li Based Alloys
for High-Strength Applications. Metals. 2020;10(8). doi:10.3390/met10080987
apa: Grydin, O., Stolbchenko, M., Schaper, M., Belejová, S., Králík, R., Bajtošová,
L., Křivská, B., Hájek, M., & Cieslar, M. (2020). New Twin-Roll Cast Al-Li
Based Alloys for High-Strength Applications. Metals, 10(8), Article
987. https://doi.org/10.3390/met10080987
bibtex: '@article{Grydin_Stolbchenko_Schaper_Belejová_Králík_Bajtošová_Křivská_Hájek_Cieslar_2020,
title={New Twin-Roll Cast Al-Li Based Alloys for High-Strength Applications},
volume={10}, DOI={10.3390/met10080987},
number={8987}, journal={Metals}, author={Grydin, Olexandr and Stolbchenko, Mykhailo
and Schaper, Mirko and Belejová, Sára and Králík, Rostislav and Bajtošová, Lucia
and Křivská, Barbora and Hájek, Michal and Cieslar, Miroslav}, year={2020} }'
chicago: Grydin, Olexandr, Mykhailo Stolbchenko, Mirko Schaper, Sára Belejová, Rostislav
Králík, Lucia Bajtošová, Barbora Křivská, Michal Hájek, and Miroslav Cieslar.
“New Twin-Roll Cast Al-Li Based Alloys for High-Strength Applications.” Metals
10, no. 8 (2020). https://doi.org/10.3390/met10080987.
ieee: 'O. Grydin et al., “New Twin-Roll Cast Al-Li Based Alloys for High-Strength
Applications,” Metals, vol. 10, no. 8, Art. no. 987, 2020, doi: 10.3390/met10080987.'
mla: Grydin, Olexandr, et al. “New Twin-Roll Cast Al-Li Based Alloys for High-Strength
Applications.” Metals, vol. 10, no. 8, 987, 2020, doi:10.3390/met10080987.
short: O. Grydin, M. Stolbchenko, M. Schaper, S. Belejová, R. Králík, L. Bajtošová,
B. Křivská, M. Hájek, M. Cieslar, Metals 10 (2020).
date_created: 2021-09-16T16:24:50Z
date_updated: 2023-06-01T14:30:52Z
department:
- _id: '158'
doi: 10.3390/met10080987
intvolume: ' 10'
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.mdpi.com/2075-4701/10/8/987/htm
oa: '1'
publication: Metals
publication_identifier:
issn:
- 2075-4701
publication_status: published
quality_controlled: '1'
status: public
title: New Twin-Roll Cast Al-Li Based Alloys for High-Strength Applications
type: journal_article
user_id: '43720'
volume: 10
year: '2020'
...