---
_id: '58163'
abstract:
- lang: eng
text: Fibre-reinforced polymers are increasingly used due to their high specific
strength, making them suitable for local sheet metal reinforcement. This allows
improved overall mechanical properties with reduced wall thickness of the sheet
metal part and, thus, lower weight of the components. One of the main focuses
of research into such hybrid structures is on the adhesive properties and the
respective failure behaviour of the interfaces. Generally, the failure behaviour
under the influence of mechanical loads can be divided into adhesive, cohesive
and mixed-mode failure. The correlation between observed failure behaviour and
adhesion properties of the hybrid composite materials is analysed in detail in
this work. The hybrid composite consists of an aluminium sheet of the alloy EN
AW‑6082 T6 and thermoset carbon fibre-reinforced plastic (CFRP) prepreg. The aluminium
sheet was laser pretreated before hybrid production to improve the adhesion properties.
The specimens studied were produced by the prepreg pressing process, in which
the components are cured and joined simultaneously. The influences of the thickness
of the CFRP part, the layup, the fibre orientation at the boundary layer, and
the laser pretreatment parameters on the properties of the hybrid joints were
investigated.
article_type: original
author:
- first_name: Shuang
full_name: Wu, Shuang
id: '48039'
last_name: Wu
orcid: 0000-0001-8645-9952
- first_name: Alexander
full_name: Delp, Alexander
last_name: Delp
- first_name: Jonathan
full_name: Freund, Jonathan
last_name: Freund
- first_name: Frank
full_name: Walther, Frank
last_name: Walther
- first_name: Jan
full_name: Haubrich, Jan
last_name: Haubrich
- first_name: Miriam
full_name: Löbbecke, Miriam
last_name: Löbbecke
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
citation:
ama: Wu S, Delp A, Freund J, et al. Correlation between interlaminar shear strength
of CFRP and joint strength of aluminium-CFRP hybrid joints. The Journal of
Adhesion. Published online 2025:1-26. doi:10.1080/00218464.2024.2439956
apa: Wu, S., Delp, A., Freund, J., Walther, F., Haubrich, J., Löbbecke, M., &
Tröster, T. (2025). Correlation between interlaminar shear strength of CFRP and
joint strength of aluminium-CFRP hybrid joints. The Journal of Adhesion,
1–26. https://doi.org/10.1080/00218464.2024.2439956
bibtex: '@article{Wu_Delp_Freund_Walther_Haubrich_Löbbecke_Tröster_2025, title={Correlation
between interlaminar shear strength of CFRP and joint strength of aluminium-CFRP
hybrid joints}, DOI={10.1080/00218464.2024.2439956},
journal={The Journal of Adhesion}, publisher={Informa UK Limited}, author={Wu,
Shuang and Delp, Alexander and Freund, Jonathan and Walther, Frank and Haubrich,
Jan and Löbbecke, Miriam and Tröster, Thomas}, year={2025}, pages={1–26} }'
chicago: Wu, Shuang, Alexander Delp, Jonathan Freund, Frank Walther, Jan Haubrich,
Miriam Löbbecke, and Thomas Tröster. “Correlation between Interlaminar Shear Strength
of CFRP and Joint Strength of Aluminium-CFRP Hybrid Joints.” The Journal of
Adhesion, 2025, 1–26. https://doi.org/10.1080/00218464.2024.2439956.
ieee: 'S. Wu et al., “Correlation between interlaminar shear strength of
CFRP and joint strength of aluminium-CFRP hybrid joints,” The Journal of Adhesion,
pp. 1–26, 2025, doi: 10.1080/00218464.2024.2439956.'
mla: Wu, Shuang, et al. “Correlation between Interlaminar Shear Strength of CFRP
and Joint Strength of Aluminium-CFRP Hybrid Joints.” The Journal of Adhesion,
Informa UK Limited, 2025, pp. 1–26, doi:10.1080/00218464.2024.2439956.
short: S. Wu, A. Delp, J. Freund, F. Walther, J. Haubrich, M. Löbbecke, T. Tröster,
The Journal of Adhesion (2025) 1–26.
date_created: 2025-01-13T08:16:46Z
date_updated: 2026-02-20T12:49:17Z
department:
- _id: '321'
- _id: '149'
- _id: '9'
doi: 10.1080/00218464.2024.2439956
keyword:
- Prepreg pressing process
- hybrid joints
- laser surface pretreatment
- intrinsic manufacturing
- CFRP
- aluminium
- materials engineering
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.tandfonline.com/doi/full/10.1080/00218464.2024.2439956?src=
oa: '1'
page: 1-26
publication: The Journal of Adhesion
publication_identifier:
issn:
- 0021-8464
- 1545-5823
publication_status: published
publisher: Informa UK Limited
quality_controlled: '1'
status: public
title: Correlation between interlaminar shear strength of CFRP and joint strength
of aluminium-CFRP hybrid joints
type: journal_article
user_id: '48039'
year: '2025'
...
---
_id: '62642'
author:
- first_name: Stephan
full_name: Kruse, Stephan
id: '38254'
last_name: Kruse
- first_name: Jan
full_name: Brockmeier, Jan
id: '67349'
last_name: Brockmeier
- first_name: Max
full_name: Schwengelbeck, Max
last_name: Schwengelbeck
- first_name: Tobias
full_name: Schwabe, Tobias
id: '39217'
last_name: Schwabe
- first_name: J. Christoph
full_name: Scheytt, J. Christoph
id: '37144'
last_name: Scheytt
orcid: '0000-0002-5950-6618 '
citation:
ama: 'Kruse S, Brockmeier J, Schwengelbeck M, Schwabe T, Scheytt JC. A Photonic
Assisted Visible Light FMCW Lidar System for Large Aperture Phased Array MIMO
Based on LEDs. In: 2025 55th European Microwave Conference (EuMC). ; 2025:602-605.
doi:10.23919/EuMC65286.2025.11235259'
apa: Kruse, S., Brockmeier, J., Schwengelbeck, M., Schwabe, T., & Scheytt, J.
C. (2025). A Photonic Assisted Visible Light FMCW Lidar System for Large Aperture
Phased Array MIMO Based on LEDs. 2025 55th European Microwave Conference (EuMC),
602–605. https://doi.org/10.23919/EuMC65286.2025.11235259
bibtex: '@inproceedings{Kruse_Brockmeier_Schwengelbeck_Schwabe_Scheytt_2025, title={A
Photonic Assisted Visible Light FMCW Lidar System for Large Aperture Phased Array
MIMO Based on LEDs}, DOI={10.23919/EuMC65286.2025.11235259},
booktitle={2025 55th European Microwave Conference (EuMC)}, author={Kruse, Stephan
and Brockmeier, Jan and Schwengelbeck, Max and Schwabe, Tobias and Scheytt, J.
Christoph}, year={2025}, pages={602–605} }'
chicago: Kruse, Stephan, Jan Brockmeier, Max Schwengelbeck, Tobias Schwabe, and
J. Christoph Scheytt. “A Photonic Assisted Visible Light FMCW Lidar System for
Large Aperture Phased Array MIMO Based on LEDs.” In 2025 55th European Microwave
Conference (EuMC), 602–5, 2025. https://doi.org/10.23919/EuMC65286.2025.11235259.
ieee: 'S. Kruse, J. Brockmeier, M. Schwengelbeck, T. Schwabe, and J. C. Scheytt,
“A Photonic Assisted Visible Light FMCW Lidar System for Large Aperture Phased
Array MIMO Based on LEDs,” in 2025 55th European Microwave Conference (EuMC),
2025, pp. 602–605, doi: 10.23919/EuMC65286.2025.11235259.'
mla: Kruse, Stephan, et al. “A Photonic Assisted Visible Light FMCW Lidar System
for Large Aperture Phased Array MIMO Based on LEDs.” 2025 55th European Microwave
Conference (EuMC), 2025, pp. 602–05, doi:10.23919/EuMC65286.2025.11235259.
short: 'S. Kruse, J. Brockmeier, M. Schwengelbeck, T. Schwabe, J.C. Scheytt, in:
2025 55th European Microwave Conference (EuMC), 2025, pp. 602–605.'
date_created: 2025-11-27T07:10:46Z
date_updated: 2025-11-27T07:11:40Z
department:
- _id: '58'
doi: 10.23919/EuMC65286.2025.11235259
keyword:
- Phased arrays
- Optical fibers
- Optical fiber sensors
- Laser radar
- Optical variables measurement
- Apertures
- Light emitting diodes
- Optical receivers
- Optical transmitters
- Optical modulation
- Lidar
- light detection and ranging
- FMCW
- frequency modulated contentious wave
- visible light sensing (VLS)
- visible light communication (VLC)
- automotive headlights
- light emitting diode (LED)
- microwave photonics
- wireless sensing
language:
- iso: eng
page: 602-605
publication: 2025 55th European Microwave Conference (EuMC)
status: public
title: A Photonic Assisted Visible Light FMCW Lidar System for Large Aperture Phased
Array MIMO Based on LEDs
type: conference
user_id: '38254'
year: '2025'
...
---
_id: '62641'
author:
- first_name: Stephan
full_name: Kruse, Stephan
id: '38254'
last_name: Kruse
- first_name: Jabil
full_name: Diri, Jabil
last_name: Diri
- first_name: Thomas
full_name: Mager, Thomas
last_name: Mager
- first_name: Christian
full_name: Kress, Christian
id: '13256'
last_name: Kress
orcid: 0000-0002-4403-2237
- first_name: J. Christoph
full_name: Scheytt, J. Christoph
id: '37144'
last_name: Scheytt
orcid: '0000-0002-5950-6618 '
citation:
ama: 'Kruse S, Diri J, Mager T, Kress C, Scheytt JC. Electrooptical Integration
of an Electronic Photonic Integrated Circuit Into Plastic Substrates Using Mid-Technology.
In: 2025 55th European Microwave Conference (EuMC). ; 2025:127-130. doi:10.23919/EuMC65286.2025.11235121'
apa: Kruse, S., Diri, J., Mager, T., Kress, C., & Scheytt, J. C. (2025). Electrooptical
Integration of an Electronic Photonic Integrated Circuit Into Plastic Substrates
Using Mid-Technology. 2025 55th European Microwave Conference (EuMC), 127–130.
https://doi.org/10.23919/EuMC65286.2025.11235121
bibtex: '@inproceedings{Kruse_Diri_Mager_Kress_Scheytt_2025, title={Electrooptical
Integration of an Electronic Photonic Integrated Circuit Into Plastic Substrates
Using Mid-Technology}, DOI={10.23919/EuMC65286.2025.11235121},
booktitle={2025 55th European Microwave Conference (EuMC)}, author={Kruse, Stephan
and Diri, Jabil and Mager, Thomas and Kress, Christian and Scheytt, J. Christoph},
year={2025}, pages={127–130} }'
chicago: Kruse, Stephan, Jabil Diri, Thomas Mager, Christian Kress, and J. Christoph
Scheytt. “Electrooptical Integration of an Electronic Photonic Integrated Circuit
Into Plastic Substrates Using Mid-Technology.” In 2025 55th European Microwave
Conference (EuMC), 127–30, 2025. https://doi.org/10.23919/EuMC65286.2025.11235121.
ieee: 'S. Kruse, J. Diri, T. Mager, C. Kress, and J. C. Scheytt, “Electrooptical
Integration of an Electronic Photonic Integrated Circuit Into Plastic Substrates
Using Mid-Technology,” in 2025 55th European Microwave Conference (EuMC),
2025, pp. 127–130, doi: 10.23919/EuMC65286.2025.11235121.'
mla: Kruse, Stephan, et al. “Electrooptical Integration of an Electronic Photonic
Integrated Circuit Into Plastic Substrates Using Mid-Technology.” 2025 55th
European Microwave Conference (EuMC), 2025, pp. 127–30, doi:10.23919/EuMC65286.2025.11235121.
short: 'S. Kruse, J. Diri, T. Mager, C. Kress, J.C. Scheytt, in: 2025 55th European
Microwave Conference (EuMC), 2025, pp. 127–130.'
date_created: 2025-11-27T07:10:33Z
date_updated: 2025-11-27T07:12:30Z
department:
- _id: '58'
- _id: '241'
doi: 10.23919/EuMC65286.2025.11235121
keyword:
- Optical fibers
- Integrated optics
- Semiconductor device measurement
- Laser radar
- Optical device fabrication
- Photonic integrated circuits
- Microwave theory and techniques
- Optical fiber devices
- Plastics
- Substrates
- Microwave photonics
- photonic radar
- optical LO distribution
- mechatronic integrated device (MID)
language:
- iso: eng
page: 127-130
publication: 2025 55th European Microwave Conference (EuMC)
status: public
title: Electrooptical Integration of an Electronic Photonic Integrated Circuit Into
Plastic Substrates Using Mid-Technology
type: conference
user_id: '38254'
year: '2025'
...
---
_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: '51218'
abstract:
- lang: eng
text: 'Polymer composites represent the industry standard in injection molding for
the production of plastic components with increased requirements in terms of heat
resistance and stiffness. In the field of laser sintering (LS), these materials
are less common so far. In order to extend the available material variety for
the LS process, new ceramic-filled Polyamide 613 powders are investigated within
the scope of this work. Here, the resulting properties from two different powder
production methods are compared. One filled powder is produced by dry blending
and the other powder with the same filler and filling ratio is produced by encapsulating
the filler particles inside the polymer particles within the dissolution-precipitation
process. It was found that encapsulating the filler particles can provide certain
benefits for the processability, for example an improved powder flowability or
better filler dispersion. However, encapsulating the filler also alters the thermal
properties of the precipitated powder. '
author:
- first_name: Ivo
full_name: Kletetzka, Ivo
id: '50769'
last_name: Kletetzka
- first_name: Fabian
full_name: Neitzel, Fabian
id: '72307'
last_name: Neitzel
orcid: '0009-0004-8412-3645 '
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
citation:
ama: 'Kletetzka I, Neitzel F, Schmid H-J. Assessing the Impact of the Powder Production
Method on Ceramic-filled Polyamide Composites made by Laser Sintering. In: Beaman
J, ed. Proceedings of the 34th Annual International Solid Freeform Fabrication
Symposium. ; 2023. doi:https://doi.org/10.26153/tsw/50931'
apa: Kletetzka, I., Neitzel, F., & Schmid, H.-J. (2023). Assessing the Impact
of the Powder Production Method on Ceramic-filled Polyamide Composites made by
Laser Sintering. In J. Beaman (Ed.), Proceedings of the 34th Annual International
Solid Freeform Fabrication Symposium. https://doi.org/10.26153/tsw/50931
bibtex: '@inproceedings{Kletetzka_Neitzel_Schmid_2023, place={Laboratory for Freeform
Fabrication and University of Texas, Austin}, title={Assessing the Impact of the
Powder Production Method on Ceramic-filled Polyamide Composites made by Laser
Sintering}, DOI={https://doi.org/10.26153/tsw/50931},
booktitle={Proceedings of the 34th Annual International Solid Freeform Fabrication
Symposium}, author={Kletetzka, Ivo and Neitzel, Fabian and Schmid, Hans-Joachim},
editor={Beaman, Joseph}, year={2023} }'
chicago: Kletetzka, Ivo, Fabian Neitzel, and Hans-Joachim Schmid. “Assessing the
Impact of the Powder Production Method on Ceramic-Filled Polyamide Composites
Made by Laser Sintering.” In Proceedings of the 34th Annual International Solid
Freeform Fabrication Symposium, edited by Joseph Beaman. Laboratory for Freeform
Fabrication and University of Texas, Austin, 2023. https://doi.org/10.26153/tsw/50931.
ieee: 'I. Kletetzka, F. Neitzel, and H.-J. Schmid, “Assessing the Impact of the
Powder Production Method on Ceramic-filled Polyamide Composites made by Laser
Sintering,” in Proceedings of the 34th Annual International Solid Freeform
Fabrication Symposium, Austin, 2023, doi: https://doi.org/10.26153/tsw/50931.'
mla: Kletetzka, Ivo, et al. “Assessing the Impact of the Powder Production Method
on Ceramic-Filled Polyamide Composites Made by Laser Sintering.” Proceedings
of the 34th Annual International Solid Freeform Fabrication Symposium, edited
by Joseph Beaman, 2023, doi:https://doi.org/10.26153/tsw/50931.
short: 'I. Kletetzka, F. Neitzel, H.-J. Schmid, in: J. Beaman (Ed.), Proceedings
of the 34th Annual International Solid Freeform Fabrication Symposium, Laboratory
for Freeform Fabrication and University of Texas, Austin, 2023.'
conference:
end_date: 2023-08-16
location: Austin
name: 34th Annual International Solid Freeform Fabrication Symposium
start_date: 2023-08-14
date_created: 2024-02-07T13:59:25Z
date_updated: 2024-04-02T12:46:08Z
department:
- _id: '150'
- _id: '219'
- _id: '624'
- _id: '9'
doi: https://doi.org/10.26153/tsw/50931
editor:
- first_name: Joseph
full_name: Beaman, Joseph
last_name: Beaman
keyword:
- Additive Manufacturing
- Laser Sintering
- Filled Materials
- Composites
- Polyamide 613
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.sffsymposium.org/
oa: '1'
place: Laboratory for Freeform Fabrication and University of Texas, Austin
publication: Proceedings of the 34th Annual International Solid Freeform Fabrication
Symposium
publication_status: published
quality_controlled: '1'
status: public
title: Assessing the Impact of the Powder Production Method on Ceramic-filled Polyamide
Composites made by Laser Sintering
type: conference
user_id: '50769'
year: '2023'
...
---
_id: '46862'
abstract:
- lang: eng
text: The high flammability of components manufactured by laser sintering (LS) using
standard polyamide 12 (PA12) powder still severely restricts their use in industries
such as electronics, aviation, and transportation. A key factor for the further
establishment of LS is the expansion of the material portfolio with, for example,
refreshable and halogen-free flame-retardant (FR) powder materials. Accordingly,
various halogen-free FRs are investigated in this work and evaluated with respect
to their use in LS. First, their decomposition behavior and mode of action are
examined. Subsequently, the additives are dry blended with PA12 to investigate
properties relevant for LS, such as particle morphology, thermal behavior and
melt viscosity. Afterwards, test specimens for UL94 vertical flame-retardancy
tests are produced by processing the dry blends on an EOS P3 LS system. Finally,
the process stability of the process-aged powder blends is investigated by again
examining the thermal behavior and melt viscosity.
author:
- first_name: Fabian
full_name: Neitzel, Fabian
id: '72307'
last_name: Neitzel
orcid: '0009-0004-8412-3645 '
- first_name: Ivo
full_name: Kletetzka, Ivo
id: '50769'
last_name: Kletetzka
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
citation:
ama: 'Neitzel F, Kletetzka I, Schmid H-J. Halogen-Free Flame Retardant Powder Materials
for Laser Sintering: Evaluation and Process Stability Analysis. In: Beaman J,
ed. Proceedings of the 34th Annual International Solid Freeform Fabrication
Symposium. ; 2023. doi:https://doi.org/10.26153/tsw/50926'
apa: 'Neitzel, F., Kletetzka, I., & Schmid, H.-J. (2023). Halogen-Free Flame
Retardant Powder Materials for Laser Sintering: Evaluation and Process Stability
Analysis. In J. Beaman (Ed.), Proceedings of the 34th Annual International
Solid Freeform Fabrication Symposium. https://doi.org/10.26153/tsw/50926'
bibtex: '@inproceedings{Neitzel_Kletetzka_Schmid_2023, place={Laboratory for Freeform
Fabrication and University of Texas, Austin}, title={Halogen-Free Flame Retardant
Powder Materials for Laser Sintering: Evaluation and Process Stability Analysis},
DOI={https://doi.org/10.26153/tsw/50926},
booktitle={Proceedings of the 34th Annual International Solid Freeform Fabrication
Symposium}, author={Neitzel, Fabian and Kletetzka, Ivo and Schmid, Hans-Joachim},
editor={Beaman, Joseph}, year={2023} }'
chicago: 'Neitzel, Fabian, Ivo Kletetzka, and Hans-Joachim Schmid. “Halogen-Free
Flame Retardant Powder Materials for Laser Sintering: Evaluation and Process Stability
Analysis.” In Proceedings of the 34th Annual International Solid Freeform Fabrication
Symposium, edited by Joseph Beaman. Laboratory for Freeform Fabrication and
University of Texas, Austin, 2023. https://doi.org/10.26153/tsw/50926.'
ieee: 'F. Neitzel, I. Kletetzka, and H.-J. Schmid, “Halogen-Free Flame Retardant
Powder Materials for Laser Sintering: Evaluation and Process Stability Analysis,”
in Proceedings of the 34th Annual International Solid Freeform Fabrication
Symposium, Austin, 2023, doi: https://doi.org/10.26153/tsw/50926.'
mla: 'Neitzel, Fabian, et al. “Halogen-Free Flame Retardant Powder Materials for
Laser Sintering: Evaluation and Process Stability Analysis.” Proceedings of
the 34th Annual International Solid Freeform Fabrication Symposium, edited
by Joseph Beaman, 2023, doi:https://doi.org/10.26153/tsw/50926.'
short: 'F. Neitzel, I. Kletetzka, H.-J. Schmid, in: J. Beaman (Ed.), Proceedings
of the 34th Annual International Solid Freeform Fabrication Symposium, Laboratory
for Freeform Fabrication and University of Texas, Austin, 2023.'
conference:
end_date: 2023-08-16
location: Austin
name: 34th Annual International Solid Freeform Fabrication Symposium
start_date: 2023-08-14
date_created: 2023-09-07T12:11:51Z
date_updated: 2024-04-02T12:43:51Z
department:
- _id: '150'
- _id: '219'
- _id: '624'
- _id: '9'
doi: https://doi.org/10.26153/tsw/50926
editor:
- first_name: Joseph
full_name: Beaman, Joseph
last_name: Beaman
keyword:
- Additive Manufacturing
- Laser Sintering
- Flame Retardant
- Polyamide 12
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.sffsymposium.org/
oa: '1'
place: Laboratory for Freeform Fabrication and University of Texas, Austin
publication: Proceedings of the 34th Annual International Solid Freeform Fabrication
Symposium
publication_status: published
quality_controlled: '1'
status: public
title: 'Halogen-Free Flame Retardant Powder Materials for Laser Sintering: Evaluation
and Process Stability Analysis'
type: conference
user_id: '72307'
year: '2023'
...
---
_id: '43371'
abstract:
- lang: eng
text: Laser structuring to improve the adhesion properties of steel substrates in
fiber-metal laminates offers many advantages that are highly suitable for modern
industrial requirements. Maintenance and energy costs are relatively low, it is
easy to automate, and there are no by-products such as chemicals or abrasives
to dispose of or recycle. This makes laser structuring a particularly environmentally
friendly process, which is nowadays more important than ever. On the other hand,
the process time for laser structuring is much higher than for chemical pre-treatment,
for example. In past studies, the time and cost efficiency of the laser structuring
process has tended to play a minor role. However, there are approaches in which
laser structured surfaces are adapted to the shear stress peaks occurring within
the adhesive layer, thus requiring only partial structuring of the area to be
bonded, potentially saving process time. In this experimental study, electrolytically
galvanized steel substrates were partially laser structured to match the shear
stress distribution and then bonded to a carbon fiber-reinforced plastic. The
adhesion properties achieved were characterized using shear tensile tests and
compared with the properties of the fully structured ones. With the partial laser
structuring, a saving of 66 % of the conventional process time was achieved while
maintaining 95 % of the same shear strength.
author:
- first_name: Dietrich
full_name: Voswinkel, Dietrich
id: '52634'
last_name: Voswinkel
citation:
ama: Voswinkel D. Application of a new strategy for time-efficient laser treatment
of galvanized steel substrates to improve the adhesion properties. Journal
of Manufacturing Processes. 2023;94:10-19. doi:/10.1016/j.jmapro.2023.03.056
apa: Voswinkel, D. (2023). Application of a new strategy for time-efficient laser
treatment of galvanized steel substrates to improve the adhesion properties. Journal
of Manufacturing Processes, 94, 10–19. https://doi.org//10.1016/j.jmapro.2023.03.056
bibtex: '@article{Voswinkel_2023, title={Application of a new strategy for time-efficient
laser treatment of galvanized steel substrates to improve the adhesion properties},
volume={94}, DOI={/10.1016/j.jmapro.2023.03.056},
journal={Journal of Manufacturing Processes}, publisher={Elsevier}, author={Voswinkel,
Dietrich}, year={2023}, pages={10–19} }'
chicago: 'Voswinkel, Dietrich. “Application of a New Strategy for Time-Efficient
Laser Treatment of Galvanized Steel Substrates to Improve the Adhesion Properties.”
Journal of Manufacturing Processes 94 (2023): 10–19. https://doi.org//10.1016/j.jmapro.2023.03.056.'
ieee: 'D. Voswinkel, “Application of a new strategy for time-efficient laser treatment
of galvanized steel substrates to improve the adhesion properties,” Journal
of Manufacturing Processes, vol. 94, pp. 10–19, 2023, doi: /10.1016/j.jmapro.2023.03.056.'
mla: Voswinkel, Dietrich. “Application of a New Strategy for Time-Efficient Laser
Treatment of Galvanized Steel Substrates to Improve the Adhesion Properties.”
Journal of Manufacturing Processes, vol. 94, Elsevier, 2023, pp. 10–19,
doi:/10.1016/j.jmapro.2023.03.056.
short: D. Voswinkel, Journal of Manufacturing Processes 94 (2023) 10–19.
date_created: 2023-04-03T08:46:43Z
date_updated: 2023-04-03T08:47:06Z
department:
- _id: '9'
- _id: '321'
- _id: '158'
doi: /10.1016/j.jmapro.2023.03.056
intvolume: ' 94'
keyword:
- Laser treatment Adhesive bonding Surface technology Hybrid materials
language:
- iso: eng
main_file_link:
- url: https://www.sciencedirect.com/science/article/abs/pii/S1526612523002682?via%3Dihub
page: 10-19
publication: Journal of Manufacturing Processes
publisher: Elsevier
status: public
title: Application of a new strategy for time-efficient laser treatment of galvanized
steel substrates to improve the adhesion properties
type: journal_article
user_id: '52634'
volume: 94
year: '2023'
...
---
_id: '43046'
abstract:
- lang: eng
text: In the laser sintering technology, the semi-crystalline polymer material is
exposed to elevated temperatures during processing, which leads to serious material
ageing for most materials. This has already been investigated intensively by various
authors. However, the ageing of the material at ambient temperatures during shelf
life has not been the focus so far. The need to analyse the shelf life can be
derived from an ecological and economic point of view. This work is focusing on
the shelf life of PA2200 (PA12). To reduce the potential influences of powder
production fluctuations, two different powder batches stored for 5.5 years and
6.5 years are investigated and compared to a reference powder produced 0.5 years
before these investigations. Multiple powder analyses and part characterisations
have been performed. A significant yellowing and molecular chain length reduction
can be derived from the measurement results. Whereas the influence on mechanical
part performance was minor, the parts built with the stored powders are more yellowish.
As it is most likely that this is due to the consumption of polyamide stabilisers,
it can be assumed that these parts will be subject to significantly faster ageing.
Therefore, it is still not recommended to use the stored powders for critical
parts or light intense and humid environments.
author:
- first_name: Sven Helge
full_name: Klippstein, Sven Helge
id: '71545'
last_name: Klippstein
- first_name: Ivo
full_name: Kletetzka, Ivo
id: '50769'
last_name: Kletetzka
- first_name: Ilknur
full_name: Sural, Ilknur
last_name: Sural
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
citation:
ama: Klippstein SH, Kletetzka I, Sural I, Schmid H-J. Influence of a prolonged shelf
time on PA12 laser sintering powder and resulting part properties. The International
Journal of Advanced Manufacturing Technology . Published online 2023. doi:https://doi.org/10.1007/s00170-023-11243-1
apa: Klippstein, S. H., Kletetzka, I., Sural, I., & Schmid, H.-J. (2023). Influence
of a prolonged shelf time on PA12 laser sintering powder and resulting part properties.
The International Journal of Advanced Manufacturing Technology . https://doi.org/10.1007/s00170-023-11243-1
bibtex: '@article{Klippstein_Kletetzka_Sural_Schmid_2023, title={Influence of a
prolonged shelf time on PA12 laser sintering powder and resulting part properties},
DOI={https://doi.org/10.1007/s00170-023-11243-1},
journal={The International Journal of Advanced Manufacturing Technology }, publisher={Springer},
author={Klippstein, Sven Helge and Kletetzka, Ivo and Sural, Ilknur and Schmid,
Hans-Joachim}, year={2023} }'
chicago: Klippstein, Sven Helge, Ivo Kletetzka, Ilknur Sural, and Hans-Joachim Schmid.
“Influence of a Prolonged Shelf Time on PA12 Laser Sintering Powder and Resulting
Part Properties.” The International Journal of Advanced Manufacturing Technology
, 2023. https://doi.org/10.1007/s00170-023-11243-1.
ieee: 'S. H. Klippstein, I. Kletetzka, I. Sural, and H.-J. Schmid, “Influence of
a prolonged shelf time on PA12 laser sintering powder and resulting part properties,”
The International Journal of Advanced Manufacturing Technology , 2023,
doi: https://doi.org/10.1007/s00170-023-11243-1.'
mla: Klippstein, Sven Helge, et al. “Influence of a Prolonged Shelf Time on PA12
Laser Sintering Powder and Resulting Part Properties.” The International Journal
of Advanced Manufacturing Technology , Springer, 2023, doi:https://doi.org/10.1007/s00170-023-11243-1.
short: S.H. Klippstein, I. Kletetzka, I. Sural, H.-J. Schmid, The International
Journal of Advanced Manufacturing Technology (2023).
date_created: 2023-03-18T14:28:46Z
date_updated: 2023-09-07T11:57:59Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
- _id: '9'
doi: https://doi.org/10.1007/s00170-023-11243-1
keyword:
- Selective laser sintering
- Shelf life
- Polyamide 12
- powder
- PA2200
- material ageing
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://link.springer.com/article/10.1007/s00170-023-11243-1
oa: '1'
publication: 'The International Journal of Advanced Manufacturing Technology '
publication_status: published
publisher: Springer
quality_controlled: '1'
status: public
title: Influence of a prolonged shelf time on PA12 laser sintering powder and resulting
part properties
type: journal_article
user_id: '50769'
year: '2023'
...
---
_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: '24760'
abstract:
- lang: ger
text: "Anwendungen von Laser-Sinter Bauteilen als Sichtteile sind aufgrund der vergleichsweise
schlechten Oberflächenqualität sehr begrenzt. In dieser Arbeit werden dreidimensionale
Kennwerte benutzt, um die Oberflächenqualität von Laser-Sinter Bauteiloberflächen
und die Einflüsse aus unterschiedlichen Bereichen der gesamten Prozesskette zu
evaluieren. Beispielsweise wurden objektive Kennwerte, mit deren Hilfe Orangenhaut
zu identifizieren ist, und Prozessparameter, die diese deutlich vermindern, gefunden.
Mittels Durchführung von haptischen Versuchen wurde das subjektive Empfinden ermittelt
und konnten zu objektiven Kennwerten korreliert werden. Eine mikroskopische Betrachtung
des flachen Oberflächenwinkels mit verschieden farbigen Pulvern zeigt neue Erkenntnisse
zum Anschmelzvorgang von Partikeln an die Schmelze. Zur nachträglichen Glättung
von Oberflächen wurden mechanische, chemische und optische Nachbehandlungsmethoden
verwendet und deren Potential aufgezeigt. Eine abschließende neuartige Simulation
der dreidimensionalen Topografie bildet die Grundlage für ein Programm zur automatischen
und funktionsgerechten Orientierung von Bauteilen, welche am Beispiel eines realen
Bauteils erfolgreich validiert wurde. Zusammengenommen zeigen die Ergebnisse,
dass die richtige Wahl von Bauorientierung und Prozessparametern entscheidend
für die Bauteilqualität ist und selbst eine aufwendige Nachbearbeitung eine ungeschickte
Wahl derer nur schwerlich ausgleichen kann.\r\n"
author:
- first_name: Patrick
full_name: Delfs, Patrick
last_name: Delfs
citation:
ama: Delfs P. Dreidimensionale Oberflächenanalyse und Topografie-Simulation additiv
hergestellter Laser-Sinter Bauteile. Vol 22. Shaker Verlag GmbH; 2021.
apa: Delfs, P. (2021). Dreidimensionale Oberflächenanalyse und Topografie-Simulation
additiv hergestellter Laser-Sinter Bauteile (Vol. 22). Shaker Verlag GmbH.
bibtex: '@book{Delfs_2021, place={Düren}, series={Forschungsberichte des Direct
Manufacturing Research Centers}, title={Dreidimensionale Oberflächenanalyse und
Topografie-Simulation additiv hergestellter Laser-Sinter Bauteile}, volume={22},
publisher={Shaker Verlag GmbH}, author={Delfs, Patrick}, year={2021}, collection={Forschungsberichte
des Direct Manufacturing Research Centers} }'
chicago: 'Delfs, Patrick. Dreidimensionale Oberflächenanalyse und Topografie-Simulation
additiv hergestellter Laser-Sinter Bauteile. Vol. 22. Forschungsberichte des
Direct Manufacturing Research Centers. Düren: Shaker Verlag GmbH, 2021.'
ieee: 'P. Delfs, Dreidimensionale Oberflächenanalyse und Topografie-Simulation
additiv hergestellter Laser-Sinter Bauteile, vol. 22. Düren: Shaker Verlag
GmbH, 2021.'
mla: Delfs, Patrick. Dreidimensionale Oberflächenanalyse und Topografie-Simulation
additiv hergestellter Laser-Sinter Bauteile. Shaker Verlag GmbH, 2021.
short: P. Delfs, Dreidimensionale Oberflächenanalyse und Topografie-Simulation additiv
hergestellter Laser-Sinter Bauteile, Shaker Verlag GmbH, Düren, 2021.
date_created: 2021-09-21T11:36:18Z
date_updated: 2022-01-06T06:56:34Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
intvolume: ' 22'
keyword:
- Additive Fertigung
- Oberflächenqualität
- 3D
- Topografie
- Simulation
- PA12
- Laser-Sintern
- Rauheit
language:
- iso: ger
main_file_link:
- url: https://www.shaker.de/de/content/catalogue/index.asp?lang=de&ID=8&ISBN=978-3-8440-7825-1&search=yes
page: '126'
place: Düren
publication_identifier:
isbn:
- 978-3-8440-7825-1
publication_status: published
publisher: Shaker Verlag GmbH
series_title: Forschungsberichte des Direct Manufacturing Research Centers
status: public
supervisor:
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
title: Dreidimensionale Oberflächenanalyse und Topografie-Simulation additiv hergestellter
Laser-Sinter Bauteile
type: dissertation
user_id: '71545'
volume: 22
year: '2021'
...
---
_id: '28017'
abstract:
- lang: eng
text: Processing aluminum alloys employing powder bed fusion of metals (PBF-LB/M)
is becoming more attractive for the industry, especially if lightweight applications
are needed. Unfortunately, high-strength aluminum alloys such as AA7075 are prone
to hot cracking during PBF-LB/M, as well as welding. Both a large solidification
range promoted by the alloying elements zinc and copper and a high thermal gradient
accompanied with the manufacturing process conditions lead to or favor hot cracking.
In the present study, a simple method for modifying the powder surface with titanium
carbide nanoparticles (NPs) as a nucleating agent is aimed. The effect on the
microstructure with different amounts of the nucleating agent is shown. For the
aluminum alloy 7075 with 2.5 ma% titanium carbide nanoparticles, manufactured
via PBF-LB/M, crack-free samples with a refined microstructure having no discernible
melt pool boundaries and columnar grains are observed. After using a two-step
ageing heat treatment, ultimate tensile strengths up to 465 MPa and an 8.9% elongation
at break are achieved. Furthermore, it is demonstrated that not all nanoparticles
used remain in the melt pool during PBF-LB/M.
author:
- first_name: Steffen
full_name: Heiland, Steffen
id: '77250'
last_name: Heiland
- first_name: Benjamin
full_name: Milkereit, Benjamin
last_name: Milkereit
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
last_name: Hoyer
- first_name: Evgeny
full_name: Zhuravlev, Evgeny
last_name: Zhuravlev
- first_name: Olaf
full_name: Keßler, Olaf
last_name: Keßler
- first_name: Mirko
full_name: Schaper, Mirko
last_name: Schaper
citation:
ama: Heiland S, Milkereit B, Hoyer K-P, Zhuravlev E, Keßler O, Schaper M. Requirements
for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve Crack-Free
and Dense Parts. Materials. Published online 2021. doi:https://doi.org/10.3390/ma14237190
apa: Heiland, S., Milkereit, B., Hoyer, K.-P., Zhuravlev, E., Keßler, O., &
Schaper, M. (2021). Requirements for Processing High-Strength AlZnMgCu Alloys
with PBF-LB/M to Achieve Crack-Free and Dense Parts. Materials. https://doi.org/10.3390/ma14237190
bibtex: '@article{Heiland_Milkereit_Hoyer_Zhuravlev_Keßler_Schaper_2021, title={Requirements
for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve Crack-Free
and Dense Parts}, DOI={https://doi.org/10.3390/ma14237190},
journal={Materials}, author={Heiland, Steffen and Milkereit, Benjamin and Hoyer,
Kay-Peter and Zhuravlev, Evgeny and Keßler, Olaf and Schaper, Mirko}, year={2021}
}'
chicago: Heiland, Steffen, Benjamin Milkereit, Kay-Peter Hoyer, Evgeny Zhuravlev,
Olaf Keßler, and Mirko Schaper. “Requirements for Processing High-Strength AlZnMgCu
Alloys with PBF-LB/M to Achieve Crack-Free and Dense Parts.” Materials,
2021. https://doi.org/10.3390/ma14237190.
ieee: 'S. Heiland, B. Milkereit, K.-P. Hoyer, E. Zhuravlev, O. Keßler, and M. Schaper,
“Requirements for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve
Crack-Free and Dense Parts,” Materials, 2021, doi: https://doi.org/10.3390/ma14237190.'
mla: Heiland, Steffen, et al. “Requirements for Processing High-Strength AlZnMgCu
Alloys with PBF-LB/M to Achieve Crack-Free and Dense Parts.” Materials,
2021, doi:https://doi.org/10.3390/ma14237190.
short: S. Heiland, B. Milkereit, K.-P. Hoyer, E. Zhuravlev, O. Keßler, M. Schaper,
Materials (2021).
date_created: 2021-11-29T08:23:43Z
date_updated: 2022-01-06T06:57:50Z
ddc:
- '620'
department:
- _id: '9'
- _id: '158'
- _id: '219'
doi: https://doi.org/10.3390/ma14237190
file:
- access_level: closed
content_type: application/pdf
creator: heilands
date_created: 2021-11-29T08:19:19Z
date_updated: 2021-11-29T08:19:19Z
file_id: '28018'
file_name: 2021_Heiland_MDPI Materials_Requirements for Processing High-Strength
AlZnMgCu Alloys with PBF-LBM to Achieve Crack-Free and Dense Parts_print.pdf
file_size: 2202343
relation: main_file
success: 1
file_date_updated: 2021-11-29T08:19:19Z
has_accepted_license: '1'
keyword:
- grain refinement
- crack reduction
- laser beam melting
- aluminum alloy
- titanium carbide
- nanoparticle
- PBF-LB/M
language:
- iso: eng
main_file_link:
- url: https://www.mdpi.com/1996-1944/14/23/7190/htm
publication: Materials
status: public
title: Requirements for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to
Achieve Crack-Free and Dense Parts
type: journal_article
user_id: '77250'
year: '2021'
...
---
_id: '23760'
abstract:
- lang: eng
text: "The laser sintering process has been a well-established AM process for many
years.\r\nDisadvantages of LS are the low material variety and the thermal damage
of the unprocessed\r\nmaterial. The low temperature laser sintering attacks at
this point and processes powder material at\r\na build chamber temperature lower
than the recrystallization temperature. This drastic reduction in\r\ntemperature
results in significantly less thermal damage to the material. This work deals
with the\r\nlow temperature laser sintering of Polyamide 12 (PA12) on a commercial,
unmodified laser\r\nsintering system to compare it to standard laser sintered
PA12 and to create the basis for low\r\ntemperature laser sintering of high temperature
materials on such a system. First results by\r\nchanging the exposure parameters
and by fixing parts on a building platform show a processing of\r\nPA12 on an
EOS P396 at a build chamber temperature less than 100 °C instead of standard approx.\r\n175
°C."
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
citation:
ama: 'Menge D, Schmid H-J. Low Temperature Laser Sintering on a Standard System:
First Attempts and Results with PA12. In: ; 2021.'
apa: 'Menge, D., & Schmid, H.-J. (2021). Low Temperature Laser Sintering
on a Standard System: First Attempts and Results with PA12. Solid Freeform
Fabrication Symposium, Austin, TX.'
bibtex: '@inproceedings{Menge_Schmid_2021, title={Low Temperature Laser Sintering
on a Standard System: First Attempts and Results with PA12}, author={Menge, Dennis
and Schmid, Hans-Joachim}, year={2021} }'
chicago: 'Menge, Dennis, and Hans-Joachim Schmid. “Low Temperature Laser Sintering
on a Standard System: First Attempts and Results with PA12,” 2021.'
ieee: 'D. Menge and H.-J. Schmid, “Low Temperature Laser Sintering on a Standard
System: First Attempts and Results with PA12,” presented at the Solid Freeform
Fabrication Symposium, Austin, TX, 2021.'
mla: 'Menge, Dennis, and Hans-Joachim Schmid. Low Temperature Laser Sintering
on a Standard System: First Attempts and Results with PA12. 2021.'
short: 'D. Menge, H.-J. Schmid, in: 2021.'
conference:
end_date: 2021-08-04
location: Austin, TX
name: Solid Freeform Fabrication Symposium
start_date: 2021-08-02
date_created: 2021-09-03T13:19:26Z
date_updated: 2022-01-06T06:55:59Z
department:
- _id: '150'
- _id: '219'
- _id: '624'
keyword:
- Low Temp LS
- Low Temperature Laser Sintering
- Polyamid 12
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://utw10945.utweb.utexas.edu/sites/default/files/2021/052%20Low%20Temperature%20Laser%20Sintering%20on%20a%20Standard%20Syst.pdf
oa: '1'
status: public
title: 'Low Temperature Laser Sintering on a Standard System: First Attempts and Results
with PA12'
type: conference
user_id: '29240'
year: '2021'
...
---
_id: '24086'
abstract:
- lang: eng
text: "Laser beam melting (LBM) is an advanced manufacturing technology providing\r\nspecial
features and the possibility to produce complex and individual parts directly\r\nfrom
a CAD model. TiAl6V4 is the most common used titanium alloy particularly\r\nin
biomedical applications. TiAl6Nb7 shows promising improvements especially\r\nregarding
biocompatible properties due to the substitution of the hazardous\r\nvanadium.
This work focuses on the examination of laser beam melted TiAl6Nb7.\r\nFor microstructural
investigation scanning electron microscopy including energydispersive\r\nx-ray
spectroscopy as well as electron backscatter diffraction are utilized.\r\nThe
laser beam melted related acicular microstructure as well as the corresponding\r\nmechanical
properties, which are determined by hardness measurements\r\nand tensile tests,
are investigated. The laser beam melted alloy meets,\r\nexcept of breaking elongation
A, the mechanical demands like ultimate tensile\r\nstrength Rm, yield strength
Rp0.2, Vickers hardness HV of international standard\r\nISO 5832-11. Next steps
contain comparison between TiAl6Nb7 and TiAl6V4 in\r\ndifferent conditions. Further
investigations aim at improving mechanical properties\r\nof TiAl6Nb7 by heat treatments
and assessment of their influence on the microstructure\r\nas well as examination
regarding the corrosive behavior in human bodylike\r\nconditions."
article_type: original
author:
- first_name: Maxwell
full_name: Hein, Maxwell
id: '52771'
last_name: Hein
orcid: 0000-0002-3732-2236
- 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: Hein M, Hoyer K-P, Schaper M. Additively processed TiAl6Nb7 alloy for biomedical
applications. Materialwissenschaft und Werkstofftechnik. 2021;52:703-716.
doi:10.1002/mawe.202000288
apa: Hein, M., Hoyer, K.-P., & Schaper, M. (2021). Additively processed TiAl6Nb7
alloy for biomedical applications. Materialwissenschaft Und Werkstofftechnik,
52, 703–716. https://doi.org/10.1002/mawe.202000288
bibtex: '@article{Hein_Hoyer_Schaper_2021, title={Additively processed TiAl6Nb7
alloy for biomedical applications}, volume={52}, DOI={10.1002/mawe.202000288},
journal={Materialwissenschaft und Werkstofftechnik}, author={Hein, Maxwell and
Hoyer, Kay-Peter and Schaper, Mirko}, year={2021}, pages={703–716} }'
chicago: 'Hein, Maxwell, Kay-Peter Hoyer, and Mirko Schaper. “Additively Processed
TiAl6Nb7 Alloy for Biomedical Applications.” Materialwissenschaft Und Werkstofftechnik
52 (2021): 703–16. https://doi.org/10.1002/mawe.202000288.'
ieee: 'M. Hein, K.-P. Hoyer, and M. Schaper, “Additively processed TiAl6Nb7 alloy
for biomedical applications,” Materialwissenschaft und Werkstofftechnik,
vol. 52, pp. 703–716, 2021, doi: 10.1002/mawe.202000288.'
mla: Hein, Maxwell, et al. “Additively Processed TiAl6Nb7 Alloy for Biomedical Applications.”
Materialwissenschaft Und Werkstofftechnik, vol. 52, 2021, pp. 703–16, doi:10.1002/mawe.202000288.
short: M. Hein, K.-P. Hoyer, M. Schaper, Materialwissenschaft Und Werkstofftechnik
52 (2021) 703–716.
date_created: 2021-09-09T15:40:08Z
date_updated: 2023-06-01T14:38:03Z
department:
- _id: '158'
doi: 10.1002/mawe.202000288
intvolume: ' 52'
keyword:
- Laser beam melting
- titanium alloy
- TiAl6Nb7
- biomedical engineering
- implants
language:
- iso: eng
page: 703-716
publication: Materialwissenschaft und Werkstofftechnik
publication_identifier:
issn:
- 0933-5137
- 1521-4052
publication_status: published
quality_controlled: '1'
status: public
title: Additively processed TiAl6Nb7 alloy for biomedical applications
type: journal_article
user_id: '43720'
volume: 52
year: '2021'
...
---
_id: '29204'
abstract:
- lang: eng
text: 'An analysis of an optical Nyquist pulse synthesizer using Mach-Zehnder modulators
is presented. The analysis allows to predict the upper limit of the effective
number of bits of this type of photonic digital-to-analog converter. The analytical
solution has been verified by means of electro-optic simulations. With this analysis
the limiting factor for certain scenarios: relative intensity noise, distortions
by driving the Mach-Zehnder modulator, or the signal generator phase noise can
quickly be identified.'
author:
- first_name: Christian
full_name: Kress, Christian
id: '13256'
last_name: Kress
- first_name: Meysam
full_name: Bahmanian, Meysam
id: '69233'
last_name: Bahmanian
- first_name: Tobias
full_name: Schwabe, Tobias
id: '39217'
last_name: Schwabe
- first_name: J. Christoph
full_name: Scheytt, J. Christoph
id: '37144'
last_name: Scheytt
orcid: https://orcid.org/0000-0002-5950-6618
citation:
ama: Kress C, Bahmanian M, Schwabe T, Scheytt JC. Analysis of the effects of jitter,
relative intensity noise, and nonlinearity on a photonic digital-to-analog converter
based on optical Nyquist pulse synthesis. Opt Express. 2021;29(15):23671–23681.
doi:10.1364/OE.427424
apa: Kress, C., Bahmanian, M., Schwabe, T., & Scheytt, J. C. (2021). Analysis
of the effects of jitter, relative intensity noise, and nonlinearity on a photonic
digital-to-analog converter based on optical Nyquist pulse synthesis. Opt.
Express, 29(15), 23671–23681. https://doi.org/10.1364/OE.427424
bibtex: '@article{Kress_Bahmanian_Schwabe_Scheytt_2021, title={Analysis of the effects
of jitter, relative intensity noise, and nonlinearity on a photonic digital-to-analog
converter based on optical Nyquist pulse synthesis}, volume={29}, DOI={10.1364/OE.427424},
number={15}, journal={Opt. Express}, publisher={OSA}, author={Kress, Christian
and Bahmanian, Meysam and Schwabe, Tobias and Scheytt, J. Christoph}, year={2021},
pages={23671–23681} }'
chicago: 'Kress, Christian, Meysam Bahmanian, Tobias Schwabe, and J. Christoph Scheytt.
“Analysis of the Effects of Jitter, Relative Intensity Noise, and Nonlinearity
on a Photonic Digital-to-Analog Converter Based on Optical Nyquist Pulse Synthesis.”
Opt. Express 29, no. 15 (2021): 23671–23681. https://doi.org/10.1364/OE.427424.'
ieee: 'C. Kress, M. Bahmanian, T. Schwabe, and J. C. Scheytt, “Analysis of the effects
of jitter, relative intensity noise, and nonlinearity on a photonic digital-to-analog
converter based on optical Nyquist pulse synthesis,” Opt. Express, vol.
29, no. 15, pp. 23671–23681, 2021, doi: 10.1364/OE.427424.'
mla: Kress, Christian, et al. “Analysis of the Effects of Jitter, Relative Intensity
Noise, and Nonlinearity on a Photonic Digital-to-Analog Converter Based on Optical
Nyquist Pulse Synthesis.” Opt. Express, vol. 29, no. 15, OSA, 2021, pp.
23671–23681, doi:10.1364/OE.427424.
short: C. Kress, M. Bahmanian, T. Schwabe, J.C. Scheytt, Opt. Express 29 (2021)
23671–23681.
date_created: 2022-01-10T11:51:47Z
date_updated: 2023-06-16T06:56:27Z
department:
- _id: '58'
- _id: '230'
doi: 10.1364/OE.427424
intvolume: ' 29'
issue: '15'
keyword:
- Analog to digital converters
- Diode lasers
- Laser sources
- Phase noise
- Signal processing
- Wavelength division multiplexers
language:
- iso: eng
page: 23671–23681
project:
- _id: '302'
grant_number: '403154102'
name: 'PONyDAC: PONyDAC II - Präziser Optischer Nyquist-Puls-Synthesizer DAC'
- _id: '299'
grant_number: 13N14882
name: 'NyPhE: NyPhE - Nyquist Silicon Photonics Engine'
publication: Opt. Express
publisher: OSA
related_material:
link:
- relation: confirmation
url: https://pubmed.ncbi.nlm.nih.gov/34614628/
status: public
title: Analysis of the effects of jitter, relative intensity noise, and nonlinearity
on a photonic digital-to-analog converter based on optical Nyquist pulse synthesis
type: journal_article
user_id: '13256'
volume: 29
year: '2021'
...
---
_id: '37585'
abstract:
- lang: ger
text: Die additive Fertigung gewinnt zunehmend Bedeutung für die Herstellung finaler
Bauteile. Ein Anwendungsgebiet liegt dabei in der Herstellung dentaler Restaurationen,
bei denen die Metallgerüste für Kronen und Brücken mittels Laser-Strahlschmelzen
hergestellt werden. Aufgrund des schichtweisen Aufbaus und der direkten digitalen
Fertigung eignet sich die additive Fertigung in besonderem Maße für die Herstellung
dieser Bauteile mit individueller Geometrie. Allerdings fehlt der Nachweis, dass
die geforderte Teilequalität reproduzierbar erreicht wird. Im Rahmen der vorliegenden
Arbeit wird ein Konzept zur Qualitätssicherung erarbeitet, das ein standardisiertes
Prüfverfahren zum Nachweis der Maschinenqualifikation für den beschriebenen Anwendungsfall
beinhaltet. Dazu werden Qualitätsanforderungen ermittelt und mit dem Stand der
Technik abgeglichen. Basierend darauf erfolgen Untersuchungen zur Korrelation
zwischen mechanischen und physikalischen Materialkennwerten, wofür durch Variation
der Fertigungsparameter gezielt Bauteile mit unterschiedlicher Porosität erzeugt
werden. In der Folge wird die Porosität als Prüfgröße festgelegt. Ausgehend von
den definierten Qualitätsanforderungen und den Versuchsergebnissen wird ein Verfahren
zum Nachweis der Maschinenqualifikation basierend auf der Berechnung des potenziellen
Maschinenleistungsindexes erarbeitet und exemplarisch für das verwendete Fertigungssystem
angewendet. Abschließend werden Ansätze zur Weiterentwicklung des Verfahrens sowie
für weiterführende Forschungsthemen dargestellt.
author:
- first_name: Andrea
full_name: Huxol, Andrea
last_name: Huxol
citation:
ama: Huxol A. Beitrag zur Qualitätssicherung in der additiven Fertigung individueller
Produkte aus CoCr-Legierungen. Vol 2020,42. Shaker Verlag; 2020.
apa: 'Huxol, A. (2020). Beitrag zur Qualitätssicherung in der additiven Fertigung
individueller Produkte aus CoCr-Legierungen: Vol. 2020,42. Shaker Verlag.'
bibtex: '@book{Huxol_2020, series={Schriftenreihe Institut für Leichtbau mit Hybridsystemen},
title={Beitrag zur Qualitätssicherung in der additiven Fertigung individueller
Produkte aus CoCr-Legierungen}, volume={2020,42}, publisher={Shaker Verlag}, author={Huxol,
Andrea}, year={2020}, collection={Schriftenreihe Institut für Leichtbau mit Hybridsystemen}
}'
chicago: Huxol, Andrea. Beitrag zur Qualitätssicherung in der additiven Fertigung
individueller Produkte aus CoCr-Legierungen. Vol. 2020,42. Schriftenreihe
Institut für Leichtbau mit Hybridsystemen. Shaker Verlag, 2020.
ieee: A. Huxol, Beitrag zur Qualitätssicherung in der additiven Fertigung individueller
Produkte aus CoCr-Legierungen, vol. 2020,42. Shaker Verlag, 2020.
mla: Huxol, Andrea. Beitrag zur Qualitätssicherung in der additiven Fertigung
individueller Produkte aus CoCr-Legierungen. Shaker Verlag, 2020.
short: A. Huxol, Beitrag zur Qualitätssicherung in der additiven Fertigung individueller
Produkte aus CoCr-Legierungen, Shaker Verlag, 2020.
date_created: 2023-01-19T11:54:15Z
date_updated: 2023-01-19T11:54:19Z
department:
- _id: '9'
- _id: '149'
- _id: '321'
keyword:
- Laser-Strahlschmelzen
- Prozessfähigkeit
language:
- iso: ger
page: '232'
publication_identifier:
isbn:
- 978-3-8440-7358-4
publication_status: published
publisher: Shaker Verlag
series_title: Schriftenreihe Institut für Leichtbau mit Hybridsystemen
status: public
supervisor:
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
title: Beitrag zur Qualitätssicherung in der additiven Fertigung individueller Produkte
aus CoCr-Legierungen
type: dissertation
user_id: '15952'
volume: 2020,42
year: '2020'
...
---
_id: '24753'
abstract:
- lang: eng
text: Polymer Laser Sintering (LS) is one of the most used Additive Manufacturing
(AM) technologies for the tool-less production of polymer parts. The raw material
is a polymer powder which is melted layerwise by the use of laser energy. Especially
for the production of single parts, small series, individualized and complex structures,
the technology is yet established in few branches. However, inhomogeneous and
hardly controllable thermal effects during manufacturing limit the build reproducibility.
The present work focuses on temperatures within so-called part cakes, their time
dependency and their influence on process quality. Therefore, a temperature measurement
system is implemented into a commercial laser sintering machine. Based on the
experimental data a model to simulate heat transfer within part cakes is set up.
Individual thermal histories during processing are successfully correlated with
position dependent powder ageing effects. Another focus is on the analysis of
a recycling optimized material. First results of correlations between thermal
histories and part properties are shown in order to provide an outlook to further
research. The data and knowledge gained through this work can be used to understand
thermal effects in greater depth and to increase the process quality via optimizations.
author:
- first_name: Stefan
full_name: Josupeit, Stefan
last_name: Josupeit
citation:
ama: Josupeit S. On the Influence of Thermal Histories within Part Cakes on the
Polymer Laser Sintering Process. Vol 11. Shaker Verlag GmbH; 2019.
apa: Josupeit, S. (2019). On the Influence of Thermal Histories within Part Cakes
on the Polymer Laser Sintering Process (Vol. 11). Shaker Verlag GmbH.
bibtex: '@book{Josupeit_2019, place={Düren}, series={Forschungsberichte des Direct
Manufacturing Research Centers}, title={On the Influence of Thermal Histories
within Part Cakes on the Polymer Laser Sintering Process}, volume={11}, publisher={Shaker
Verlag GmbH}, author={Josupeit, Stefan}, year={2019}, collection={Forschungsberichte
des Direct Manufacturing Research Centers} }'
chicago: 'Josupeit, Stefan. On the Influence of Thermal Histories within Part
Cakes on the Polymer Laser Sintering Process. Vol. 11. Forschungsberichte
Des Direct Manufacturing Research Centers. Düren: Shaker Verlag GmbH, 2019.'
ieee: 'S. Josupeit, On the Influence of Thermal Histories within Part Cakes on
the Polymer Laser Sintering Process, vol. 11. Düren: Shaker Verlag GmbH, 2019.'
mla: Josupeit, Stefan. On the Influence of Thermal Histories within Part Cakes
on the Polymer Laser Sintering Process. Shaker Verlag GmbH, 2019.
short: S. Josupeit, On the Influence of Thermal Histories within Part Cakes on the
Polymer Laser Sintering Process, Shaker Verlag GmbH, Düren, 2019.
date_created: 2021-09-21T11:23:29Z
date_updated: 2022-01-06T06:56:34Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
intvolume: ' 11'
keyword:
- Additive Manufacturing
- Polymer Laser Sintering
- Polymer Science
language:
- iso: eng
main_file_link:
- url: https://www.shaker.de/de/content/catalogue/index.asp?lang=de&ID=8&ISBN=978-3-8440-6720-0&search=yes
page: '178'
place: Düren
publication_identifier:
isbn:
- 978-3-8440-6720-0
publisher: Shaker Verlag GmbH
series_title: Forschungsberichte des Direct Manufacturing Research Centers
status: public
supervisor:
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
title: On the Influence of Thermal Histories within Part Cakes on the Polymer Laser
Sintering Process
type: dissertation
user_id: '71545'
volume: 11
year: '2019'
...
---
_id: '6543'
abstract:
- lang: eng
text: Up to 400 mW of near-IR (1370-1500 nm) femtosecond pulses are generated from
an optical parametric amplifier directly driven by a Yb:fiber oscillator delivering
100\&\#x00A0;fs pulses at 1036 nm. The process is seeded by a stable supercontinuum
obtained from a photonic crystal fiber. We use a single pass through a 3 mm, magnesium
oxide-doped, periodically poled LiNbO3 downconversion crystal to produce a near-IR
pulse train with a remarkable power stability of 1.4 % (RMS) during one hour.
Tuning is achieved by the temperature and the poling period of the nonlinear crystal.
article_type: original
author:
- first_name: J.
full_name: Mundry, J.
last_name: Mundry
- first_name: J.
full_name: Lohrenz, J.
last_name: Lohrenz
- first_name: M.
full_name: Betz, M.
last_name: Betz
citation:
ama: Mundry J, Lohrenz J, Betz M. Tunable femtosecond near-IR source by pumping
an OPA directly with a 90 MHz Yb:fiber source. Applied Optics. 2017;56(11):3104-3108.
doi:10.1364/AO.56.003104
apa: Mundry, J., Lohrenz, J., & Betz, M. (2017). Tunable femtosecond near-IR
source by pumping an OPA directly with a 90 MHz Yb:fiber source. Applied Optics,
56(11), 3104–3108. https://doi.org/10.1364/AO.56.003104
bibtex: '@article{Mundry_Lohrenz_Betz_2017, title={Tunable femtosecond near-IR source
by pumping an OPA directly with a 90 MHz Yb:fiber source}, volume={56}, DOI={10.1364/AO.56.003104}, number={11},
journal={Applied Optics}, publisher={OSA}, author={Mundry, J. and Lohrenz, J.
and Betz, M.}, year={2017}, pages={3104–3108} }'
chicago: 'Mundry, J., J. Lohrenz, and M. Betz. “Tunable Femtosecond Near-IR Source
by Pumping an OPA Directly with a 90 MHz Yb:Fiber Source.” Applied Optics
56, no. 11 (2017): 3104–8. https://doi.org/10.1364/AO.56.003104.'
ieee: J. Mundry, J. Lohrenz, and M. Betz, “Tunable femtosecond near-IR source by
pumping an OPA directly with a 90 MHz Yb:fiber source,” Applied Optics,
vol. 56, no. 11, pp. 3104–3108, 2017.
mla: Mundry, J., et al. “Tunable Femtosecond Near-IR Source by Pumping an OPA Directly
with a 90 MHz Yb:Fiber Source.” Applied Optics, vol. 56, no. 11, OSA, 2017,
pp. 3104–08, doi:10.1364/AO.56.003104.
short: J. Mundry, J. Lohrenz, M. Betz, Applied Optics 56 (2017) 3104–3108.
date_created: 2019-01-09T10:06:44Z
date_updated: 2022-01-06T07:03:11Z
department:
- _id: '230'
doi: 10.1364/AO.56.003104
intvolume: ' 56'
issue: '11'
keyword:
- Infrared and far-infrared lasers
- Ultrafast lasers
- Nonlinear optics
- parametric processes
- Parametric oscillators and amplifiers
- Femtosecond pulses
- Fiber lasers
- Fused silica
- Laser systems
- Photonic crystal fibers
- Pulse propagation
language:
- iso: eng
page: 3104-3108
project:
- _id: '53'
name: TRR 142
- _id: '54'
name: TRR 142 - Project Area A
- _id: '58'
name: TRR 142 - Subproject A1
publication: Applied Optics
publisher: OSA
status: public
title: Tunable femtosecond near-IR source by pumping an OPA directly with a 90 MHz
Yb:fiber source
type: journal_article
user_id: '49428'
volume: 56
year: '2017'
...