[{"publication":"The Journal of Adhesion","type":"journal_article","abstract":[{"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.","lang":"eng"}],"status":"public","_id":"58163","department":[{"_id":"321"},{"_id":"149"},{"_id":"9"}],"user_id":"48039","keyword":["Prepreg pressing process","hybrid joints","laser surface pretreatment","intrinsic manufacturing","CFRP","aluminium","materials engineering"],"article_type":"original","language":[{"iso":"eng"}],"quality_controlled":"1","publication_identifier":{"issn":["0021-8464","1545-5823"]},"publication_status":"published","year":"2025","page":"1-26","citation":{"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.","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} }","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.","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"},"date_updated":"2026-02-20T12:49:17Z","oa":"1","publisher":"Informa UK Limited","author":[{"full_name":"Wu, Shuang","id":"48039","last_name":"Wu","orcid":"0000-0001-8645-9952","first_name":"Shuang"},{"first_name":"Alexander","last_name":"Delp","full_name":"Delp, Alexander"},{"first_name":"Jonathan","last_name":"Freund","full_name":"Freund, Jonathan"},{"last_name":"Walther","full_name":"Walther, Frank","first_name":"Frank"},{"first_name":"Jan","full_name":"Haubrich, Jan","last_name":"Haubrich"},{"full_name":"Löbbecke, Miriam","last_name":"Löbbecke","first_name":"Miriam"},{"first_name":"Thomas","id":"553","full_name":"Tröster, Thomas","last_name":"Tröster"}],"date_created":"2025-01-13T08:16:46Z","title":"Correlation between interlaminar shear strength of CFRP and joint strength of aluminium-CFRP hybrid joints","doi":"10.1080/00218464.2024.2439956","main_file_link":[{"open_access":"1","url":"https://www.tandfonline.com/doi/full/10.1080/00218464.2024.2439956?src="}]},{"department":[{"_id":"58"}],"user_id":"38254","_id":"62642","language":[{"iso":"eng"}],"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"],"publication":"2025 55th European Microwave Conference (EuMC)","type":"conference","status":"public","date_created":"2025-11-27T07:10:46Z","author":[{"last_name":"Kruse","id":"38254","full_name":"Kruse, Stephan","first_name":"Stephan"},{"id":"67349","full_name":"Brockmeier, Jan","last_name":"Brockmeier","first_name":"Jan"},{"full_name":"Schwengelbeck, Max","last_name":"Schwengelbeck","first_name":"Max"},{"first_name":"Tobias","last_name":"Schwabe","full_name":"Schwabe, Tobias","id":"39217"},{"orcid":"0000-0002-5950-6618 ","last_name":"Scheytt","full_name":"Scheytt, J. Christoph","id":"37144","first_name":"J. Christoph"}],"date_updated":"2025-11-27T07:11:40Z","doi":"10.23919/EuMC65286.2025.11235259","title":"A Photonic Assisted Visible Light FMCW Lidar System for Large Aperture Phased Array MIMO Based on LEDs","page":"602-605","citation":{"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.","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.","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","short":"S. Kruse, J. Brockmeier, M. Schwengelbeck, T. Schwabe, J.C. Scheytt, in: 2025 55th European Microwave Conference (EuMC), 2025, pp. 602–605.","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.","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} }","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"},"year":"2025"},{"department":[{"_id":"58"},{"_id":"241"}],"user_id":"38254","_id":"62641","language":[{"iso":"eng"}],"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)"],"publication":"2025 55th European Microwave Conference (EuMC)","type":"conference","status":"public","date_created":"2025-11-27T07:10:33Z","author":[{"first_name":"Stephan","last_name":"Kruse","id":"38254","full_name":"Kruse, Stephan"},{"first_name":"Jabil","full_name":"Diri, Jabil","last_name":"Diri"},{"full_name":"Mager, Thomas","last_name":"Mager","first_name":"Thomas"},{"last_name":"Kress","orcid":"0000-0002-4403-2237","id":"13256","full_name":"Kress, Christian","first_name":"Christian"},{"first_name":"J. Christoph","id":"37144","full_name":"Scheytt, J. Christoph","orcid":"0000-0002-5950-6618 ","last_name":"Scheytt"}],"date_updated":"2025-11-27T07:12:30Z","doi":"10.23919/EuMC65286.2025.11235121","title":"Electrooptical Integration of an Electronic Photonic Integrated Circuit Into Plastic Substrates Using Mid-Technology","page":"127-130","citation":{"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","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.","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} }","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","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."},"year":"2025"},{"language":[{"iso":"eng"}],"keyword":["additive manufacturing","direct energy deposition","laser metal deposition"],"ddc":["670"],"publication":"Metals","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."}],"date_created":"2024-12-10T12:13:23Z","publisher":"MDPI AG","title":"Effect of Substrate Temperature on Bead Track Geometry of 316L in Directed Energy Deposition: Investigation and Regression Modeling","issue":"12","quality_controlled":"1","year":"2024","department":[{"_id":"321"},{"_id":"149"},{"_id":"9"}],"user_id":"49504","_id":"57699","article_type":"original","article_number":"1353","type":"journal_article","status":"public","volume":14,"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"},{"id":"90491","full_name":"Lehnert, Dennis","last_name":"Lehnert","first_name":"Dennis"},{"last_name":"Walter","full_name":"Walter, Artur","first_name":"Artur"},{"full_name":"Rohling, Robin","last_name":"Rohling","first_name":"Robin"},{"full_name":"Tröster, Thomas","id":"553","last_name":"Tröster","first_name":"Thomas"}],"oa":"1","date_updated":"2026-03-20T08:44:28Z","doi":"10.3390/met14121353","main_file_link":[{"open_access":"1","url":"https://www.mdpi.com/2075-4701/14/12/1353"}],"has_accepted_license":"1","publication_identifier":{"issn":["2075-4701"]},"publication_status":"published","intvolume":" 14","citation":{"short":"D. Chalicheemalapalli Jayasankar, S. Gnaase, D. Lehnert, A. Walter, R. Rohling, T. Tröster, Metals 14 (2024).","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} }","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.","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","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.","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.","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"}},{"keyword":["additive manufacturing (AM)","selective laser melting (SLM)","laser metal deposition (LMD)","hybrid manufacturing","process optimization","316L","1.2709"],"language":[{"iso":"eng"}],"abstract":[{"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.","lang":"eng"}],"publication":"Metals","title":"Advancements in Hybrid Additive Manufacturing: Integrating SLM and LMD for High-Performance Applications","publisher":"MDPI AG","date_created":"2024-09-10T10:19:32Z","year":"2024","quality_controlled":"1","issue":"7","article_type":"original","article_number":"772","_id":"56089","department":[{"_id":"9"},{"_id":"321"},{"_id":"149"}],"user_id":"49504","status":"public","type":"journal_article","doi":"10.3390/met14070772","main_file_link":[{"url":"https://www.mdpi.com/2075-4701/14/7/772","open_access":"1"}],"date_updated":"2026-03-20T08:44:23Z","oa":"1","volume":14,"author":[{"id":"49504","full_name":"Chalicheemalapalli Jayasankar, Deviprasad","orcid":"https://orcid.org/ 0000-0002-3446-2444","last_name":"Chalicheemalapalli Jayasankar","first_name":"Deviprasad"},{"last_name":"Gnaase","full_name":"Gnaase, Stefan","id":"25730","first_name":"Stefan"},{"id":"72351","full_name":"Kaiser, Maximilian Alexander","last_name":"Kaiser","orcid":"0009-0008-1333-3396","first_name":"Maximilian Alexander"},{"id":"90491","full_name":"Lehnert, Dennis","last_name":"Lehnert","first_name":"Dennis"},{"id":"553","full_name":"Tröster, Thomas","last_name":"Tröster","first_name":"Thomas"}],"intvolume":" 14","citation":{"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.","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} }","short":"D. Chalicheemalapalli Jayasankar, S. Gnaase, M.A. Kaiser, D. Lehnert, T. Tröster, Metals 14 (2024).","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","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","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."},"publication_identifier":{"issn":["2075-4701"]},"publication_status":"published"},{"main_file_link":[{"open_access":"1","url":"https://www.sffsymposium.org/"}],"conference":{"end_date":"2023-08-16","location":"Austin","name":"34th Annual International Solid Freeform Fabrication Symposium","start_date":"2023-08-14"},"doi":"https://doi.org/10.26153/tsw/50931","oa":"1","date_updated":"2024-04-02T12:46:08Z","author":[{"id":"50769","full_name":"Kletetzka, Ivo","last_name":"Kletetzka","first_name":"Ivo"},{"last_name":"Neitzel","orcid":"0009-0004-8412-3645 ","full_name":"Neitzel, Fabian","id":"72307","first_name":"Fabian"},{"full_name":"Schmid, Hans-Joachim","id":"464","orcid":"000-0001-8590-1921","last_name":"Schmid","first_name":"Hans-Joachim"}],"place":"Laboratory for Freeform Fabrication and University of Texas, Austin","citation":{"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.","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.","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","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} }","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.","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"},"publication_status":"published","_id":"51218","user_id":"50769","department":[{"_id":"150"},{"_id":"219"},{"_id":"624"},{"_id":"9"}],"editor":[{"first_name":"Joseph","full_name":"Beaman, Joseph","last_name":"Beaman"}],"status":"public","type":"conference","title":"Assessing the Impact of the Powder Production Method on Ceramic-filled Polyamide Composites made by Laser Sintering","date_created":"2024-02-07T13:59:25Z","year":"2023","quality_controlled":"1","keyword":["Additive Manufacturing","Laser Sintering","Filled Materials","Composites","Polyamide 613"],"language":[{"iso":"eng"}],"abstract":[{"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. ","lang":"eng"}],"publication":"Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium"},{"user_id":"72307","department":[{"_id":"150"},{"_id":"219"},{"_id":"624"},{"_id":"9"}],"_id":"46862","type":"conference","status":"public","editor":[{"first_name":"Joseph","full_name":"Beaman, Joseph","last_name":"Beaman"}],"author":[{"first_name":"Fabian","last_name":"Neitzel","orcid":"0009-0004-8412-3645 ","id":"72307","full_name":"Neitzel, Fabian"},{"last_name":"Kletetzka","full_name":"Kletetzka, Ivo","id":"50769","first_name":"Ivo"},{"full_name":"Schmid, Hans-Joachim","id":"464","orcid":"000-0001-8590-1921","last_name":"Schmid","first_name":"Hans-Joachim"}],"date_updated":"2024-04-02T12:43:51Z","oa":"1","main_file_link":[{"url":"https://www.sffsymposium.org/","open_access":"1"}],"conference":{"location":"Austin","end_date":"2023-08-16","start_date":"2023-08-14","name":"34th Annual International Solid Freeform Fabrication Symposium"},"doi":"https://doi.org/10.26153/tsw/50926","publication_status":"published","citation":{"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.","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.","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} }","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."},"place":"Laboratory for Freeform Fabrication and University of Texas, Austin","language":[{"iso":"eng"}],"keyword":["Additive Manufacturing","Laser Sintering","Flame Retardant","Polyamide 12"],"publication":"Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium","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."}],"date_created":"2023-09-07T12:11:51Z","title":"Halogen-Free Flame Retardant Powder Materials for Laser Sintering: Evaluation and Process Stability Analysis","quality_controlled":"1","year":"2023"},{"language":[{"iso":"eng"}],"keyword":["Laser treatment Adhesive bonding Surface technology Hybrid materials"],"department":[{"_id":"9"},{"_id":"321"},{"_id":"158"}],"user_id":"52634","_id":"43371","status":"public","abstract":[{"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.","lang":"eng"}],"publication":"Journal of Manufacturing Processes","type":"journal_article","doi":"/10.1016/j.jmapro.2023.03.056","main_file_link":[{"url":"https://www.sciencedirect.com/science/article/abs/pii/S1526612523002682?via%3Dihub"}],"title":"Application of a new strategy for time-efficient laser treatment of galvanized steel substrates to improve the adhesion properties","volume":94,"date_created":"2023-04-03T08:46:43Z","author":[{"first_name":"Dietrich","full_name":"Voswinkel, Dietrich","id":"52634","last_name":"Voswinkel"}],"date_updated":"2023-04-03T08:47:06Z","publisher":"Elsevier","page":"10-19","intvolume":" 94","citation":{"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","short":"D. Voswinkel, Journal of Manufacturing Processes 94 (2023) 10–19.","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} }","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.","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","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.","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."},"year":"2023"},{"status":"public","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."}],"publication":"The International Journal of Advanced Manufacturing Technology ","type":"journal_article","language":[{"iso":"eng"}],"keyword":["Selective laser sintering","Shelf life","Polyamide 12","powder","PA2200","material ageing"],"department":[{"_id":"150"},{"_id":"624"},{"_id":"219"},{"_id":"9"}],"user_id":"50769","_id":"43046","citation":{"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} }","short":"S.H. Klippstein, I. Kletetzka, I. Sural, H.-J. Schmid, The International Journal of Advanced Manufacturing Technology (2023).","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.","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","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."},"year":"2023","quality_controlled":"1","publication_status":"published","doi":"https://doi.org/10.1007/s00170-023-11243-1","main_file_link":[{"url":"https://link.springer.com/article/10.1007/s00170-023-11243-1","open_access":"1"}],"title":"Influence of a prolonged shelf time on PA12 laser sintering powder and resulting part properties","date_created":"2023-03-18T14:28:46Z","author":[{"first_name":"Sven Helge","last_name":"Klippstein","id":"71545","full_name":"Klippstein, Sven Helge"},{"first_name":"Ivo","full_name":"Kletetzka, Ivo","id":"50769","last_name":"Kletetzka"},{"full_name":"Sural, Ilknur","last_name":"Sural","first_name":"Ilknur"},{"id":"464","full_name":"Schmid, Hans-Joachim","last_name":"Schmid","orcid":"000-0001-8590-1921","first_name":"Hans-Joachim"}],"publisher":"Springer","oa":"1","date_updated":"2023-09-07T11:57:59Z"},{"ddc":["620"],"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"}],"abstract":[{"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.","lang":"eng"}],"file":[{"success":1,"relation":"main_file","content_type":"application/pdf","file_size":6222748,"access_level":"closed","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","date_updated":"2022-01-10T08:27:11Z","date_created":"2022-01-10T08:27:11Z","creator":"maxhein"}],"publication":"Metals","title":"Low Cycle Fatigue Performance of Additively Processed and Heat-Treated Ti-6Al-7Nb Alloy for Biomedical Applications","publisher":"MDPI AG","date_created":"2022-01-10T08:25:58Z","year":"2022","quality_controlled":"1","issue":"1","article_number":"122","article_type":"original","file_date_updated":"2022-01-10T08:27:11Z","_id":"29196","user_id":"43720","department":[{"_id":"158"}],"status":"public","type":"journal_article","main_file_link":[{"open_access":"1","url":"https://www.mdpi.com/2075-4701/12/1/122"}],"doi":"10.3390/met12010122","date_updated":"2023-04-27T16:42:19Z","oa":"1","author":[{"first_name":"Maxwell","orcid":"0000-0002-3732-2236","last_name":"Hein","full_name":"Hein, Maxwell","id":"52771"},{"first_name":"David","full_name":"Kokalj, David","last_name":"Kokalj"},{"first_name":"Nelson Filipe","last_name":"Lopes Dias","full_name":"Lopes Dias, Nelson Filipe"},{"last_name":"Stangier","full_name":"Stangier, Dominic","first_name":"Dominic"},{"last_name":"Oltmanns","full_name":"Oltmanns, Hilke","first_name":"Hilke"},{"last_name":"Pramanik","full_name":"Pramanik, Sudipta","first_name":"Sudipta"},{"last_name":"Kietzmann","full_name":"Kietzmann, Manfred","first_name":"Manfred"},{"id":"48411","full_name":"Hoyer, Kay-Peter","last_name":"Hoyer","first_name":"Kay-Peter"},{"first_name":"Jessica","full_name":"Meißner, Jessica","last_name":"Meißner"},{"full_name":"Tillmann, Wolfgang","last_name":"Tillmann","first_name":"Wolfgang"},{"id":"43720","full_name":"Schaper, Mirko","last_name":"Schaper","first_name":"Mirko"}],"volume":12,"citation":{"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.","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.","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","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.","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} }","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)."},"intvolume":" 12","publication_status":"published","publication_identifier":{"issn":["2075-4701"]},"has_accepted_license":"1"},{"keyword":["Additive Fertigung","Oberflächenqualität","3D","Topografie","Simulation","PA12","Laser-Sintern","Rauheit"],"language":[{"iso":"ger"}],"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"}],"title":"Dreidimensionale Oberflächenanalyse und Topografie-Simulation additiv hergestellter Laser-Sinter Bauteile","publisher":"Shaker Verlag GmbH","date_created":"2021-09-21T11:36:18Z","year":"2021","_id":"24760","department":[{"_id":"150"},{"_id":"624"},{"_id":"219"}],"user_id":"71545","series_title":"Forschungsberichte des Direct Manufacturing Research Centers","status":"public","type":"dissertation","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"}],"date_updated":"2022-01-06T06:56:34Z","volume":22,"supervisor":[{"first_name":"Hans-Joachim","full_name":"Schmid, Hans-Joachim","id":"464","last_name":"Schmid"}],"author":[{"full_name":"Delfs, Patrick","last_name":"Delfs","first_name":"Patrick"}],"place":"Düren","page":"126","intvolume":" 22","citation":{"ama":"Delfs P. Dreidimensionale Oberflächenanalyse und Topografie-Simulation additiv hergestellter Laser-Sinter Bauteile. Vol 22. Shaker Verlag GmbH; 2021.","ieee":"P. Delfs, Dreidimensionale Oberflächenanalyse und Topografie-Simulation additiv hergestellter Laser-Sinter Bauteile, vol. 22. Düren: Shaker Verlag GmbH, 2021.","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.","short":"P. Delfs, Dreidimensionale Oberflächenanalyse und Topografie-Simulation additiv hergestellter Laser-Sinter Bauteile, Shaker Verlag GmbH, Düren, 2021.","mla":"Delfs, Patrick. Dreidimensionale Oberflächenanalyse und Topografie-Simulation additiv hergestellter Laser-Sinter Bauteile. Shaker Verlag GmbH, 2021.","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} }","apa":"Delfs, P. (2021). Dreidimensionale Oberflächenanalyse und Topografie-Simulation additiv hergestellter Laser-Sinter Bauteile (Vol. 22). Shaker Verlag GmbH."},"publication_identifier":{"isbn":["978-3-8440-7825-1"]},"publication_status":"published"},{"publication":"Materials","type":"journal_article","status":"public","file":[{"file_size":2202343,"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","access_level":"closed","file_id":"28018","date_updated":"2021-11-29T08:19:19Z","date_created":"2021-11-29T08:19:19Z","creator":"heilands","success":1,"relation":"main_file","content_type":"application/pdf"}],"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."}],"department":[{"_id":"9"},{"_id":"158"},{"_id":"219"}],"user_id":"77250","_id":"28017","file_date_updated":"2021-11-29T08:19:19Z","language":[{"iso":"eng"}],"keyword":["grain refinement","crack reduction","laser beam melting","aluminum alloy","titanium carbide","nanoparticle","PBF-LB/M"],"ddc":["620"],"has_accepted_license":"1","citation":{"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} }","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).","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","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.","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.","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"},"year":"2021","date_created":"2021-11-29T08:23:43Z","author":[{"full_name":"Heiland, Steffen","id":"77250","last_name":"Heiland","first_name":"Steffen"},{"full_name":"Milkereit, Benjamin","last_name":"Milkereit","first_name":"Benjamin"},{"full_name":"Hoyer, Kay-Peter","last_name":"Hoyer","first_name":"Kay-Peter"},{"last_name":"Zhuravlev","full_name":"Zhuravlev, Evgeny","first_name":"Evgeny"},{"first_name":"Olaf","full_name":"Keßler, Olaf","last_name":"Keßler"},{"full_name":"Schaper, Mirko","last_name":"Schaper","first_name":"Mirko"}],"date_updated":"2022-01-06T06:57:50Z","doi":"https://doi.org/10.3390/ma14237190","main_file_link":[{"url":"https://www.mdpi.com/1996-1944/14/23/7190/htm"}],"title":"Requirements for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve Crack-Free and Dense Parts"},{"conference":{"name":"Solid Freeform Fabrication Symposium","start_date":"2021-08-02","end_date":"2021-08-04","location":"Austin, TX"},"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"}],"title":"Low Temperature Laser Sintering on a Standard System: First Attempts and Results with PA12","author":[{"full_name":"Menge, Dennis","id":"29240","last_name":"Menge","first_name":"Dennis"},{"first_name":"Hans-Joachim","full_name":"Schmid, Hans-Joachim","id":"464","last_name":"Schmid"}],"date_created":"2021-09-03T13:19:26Z","oa":"1","date_updated":"2022-01-06T06:55:59Z","citation":{"ama":"Menge D, Schmid H-J. Low Temperature Laser Sintering on a Standard System: First Attempts and Results with PA12. In: ; 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.","chicago":"Menge, Dennis, and Hans-Joachim Schmid. “Low Temperature Laser Sintering on a Standard System: First Attempts and Results with PA12,” 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.","mla":"Menge, Dennis, and Hans-Joachim Schmid. Low Temperature Laser Sintering on a Standard System: First Attempts and Results with PA12. 2021.","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} }","short":"D. Menge, H.-J. Schmid, in: 2021."},"year":"2021","language":[{"iso":"eng"}],"keyword":["Low Temp LS","Low Temperature Laser Sintering","Polyamid 12"],"department":[{"_id":"150"},{"_id":"219"},{"_id":"624"}],"user_id":"29240","_id":"23760","status":"public","abstract":[{"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.","lang":"eng"}],"type":"conference"},{"status":"public","type":"journal_article","article_type":"original","user_id":"43720","department":[{"_id":"158"}],"_id":"24086","citation":{"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.","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.","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","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","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.","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} }","short":"M. Hein, K.-P. Hoyer, M. Schaper, Materialwissenschaft Und Werkstofftechnik 52 (2021) 703–716."},"page":"703-716","intvolume":" 52","publication_status":"published","publication_identifier":{"issn":["0933-5137","1521-4052"]},"doi":"10.1002/mawe.202000288","author":[{"first_name":"Maxwell","orcid":"0000-0002-3732-2236","last_name":"Hein","full_name":"Hein, Maxwell","id":"52771"},{"first_name":"Kay-Peter","full_name":"Hoyer, Kay-Peter","id":"48411","last_name":"Hoyer"},{"last_name":"Schaper","id":"43720","full_name":"Schaper, Mirko","first_name":"Mirko"}],"volume":52,"date_updated":"2023-06-01T14:38:03Z","abstract":[{"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.","lang":"eng"}],"publication":"Materialwissenschaft und Werkstofftechnik","language":[{"iso":"eng"}],"keyword":["Laser beam melting","titanium alloy","TiAl6Nb7","biomedical engineering","implants"],"year":"2021","quality_controlled":"1","title":"Additively processed TiAl6Nb7 alloy for biomedical applications","date_created":"2021-09-09T15:40:08Z"},{"status":"public","type":"journal_article","user_id":"13256","department":[{"_id":"58"},{"_id":"230"}],"project":[{"_id":"302","name":"PONyDAC: PONyDAC II - Präziser Optischer Nyquist-Puls-Synthesizer DAC","grant_number":"403154102"},{"name":"NyPhE: NyPhE - Nyquist Silicon Photonics Engine","_id":"299","grant_number":"13N14882"}],"_id":"29204","citation":{"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.","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","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.","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} }"},"page":"23671–23681","intvolume":" 29","related_material":{"link":[{"url":"https://pubmed.ncbi.nlm.nih.gov/34614628/","relation":"confirmation"}]},"doi":"10.1364/OE.427424","author":[{"full_name":"Kress, Christian","id":"13256","last_name":"Kress","first_name":"Christian"},{"full_name":"Bahmanian, Meysam","id":"69233","last_name":"Bahmanian","first_name":"Meysam"},{"first_name":"Tobias","last_name":"Schwabe","id":"39217","full_name":"Schwabe, Tobias"},{"first_name":"J. Christoph","full_name":"Scheytt, J. Christoph","id":"37144","orcid":"https://orcid.org/0000-0002-5950-6618","last_name":"Scheytt"}],"volume":29,"date_updated":"2023-06-16T06:56:27Z","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."}],"publication":"Opt. Express","language":[{"iso":"eng"}],"keyword":["Analog to digital converters","Diode lasers","Laser sources","Phase noise","Signal processing","Wavelength division multiplexers"],"year":"2021","issue":"15","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","date_created":"2022-01-10T11:51:47Z","publisher":"OSA"},{"keyword":["Laser-Strahlschmelzen","Prozessfähigkeit"],"language":[{"iso":"ger"}],"_id":"37585","department":[{"_id":"9"},{"_id":"149"},{"_id":"321"}],"user_id":"15952","series_title":"Schriftenreihe Institut für Leichtbau mit Hybridsystemen","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."}],"status":"public","type":"dissertation","title":"Beitrag zur Qualitätssicherung in der additiven Fertigung individueller Produkte aus CoCr-Legierungen","date_updated":"2023-01-19T11:54:19Z","publisher":"Shaker Verlag","volume":"2020,42","supervisor":[{"last_name":"Tröster","full_name":"Tröster, Thomas","id":"553","first_name":"Thomas"}],"author":[{"first_name":"Andrea","last_name":"Huxol","full_name":"Huxol, Andrea"}],"date_created":"2023-01-19T11:54:15Z","year":"2020","page":"232","citation":{"ieee":"A. Huxol, Beitrag zur Qualitätssicherung in der additiven Fertigung individueller Produkte aus CoCr-Legierungen, vol. 2020,42. Shaker Verlag, 2020.","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.","ama":"Huxol A. 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.","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} }","apa":"Huxol, A. (2020). Beitrag zur Qualitätssicherung in der additiven Fertigung individueller Produkte aus CoCr-Legierungen: Vol. 2020,42. Shaker Verlag."},"publication_identifier":{"isbn":["978-3-8440-7358-4"]},"publication_status":"published"},{"year":"2019","title":"On the Influence of Thermal Histories within Part Cakes on the Polymer Laser Sintering Process","date_created":"2021-09-21T11:23:29Z","publisher":"Shaker Verlag GmbH","abstract":[{"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.","lang":"eng"}],"language":[{"iso":"eng"}],"keyword":["Additive Manufacturing","Polymer Laser Sintering","Polymer Science"],"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.","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.","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} }","short":"S. Josupeit, On the Influence of Thermal Histories within Part Cakes on the Polymer Laser Sintering Process, Shaker Verlag GmbH, Düren, 2019.","mla":"Josupeit, Stefan. On the Influence of Thermal Histories within Part Cakes on the Polymer Laser Sintering Process. Shaker Verlag GmbH, 2019."},"page":"178","intvolume":" 11","place":"Düren","publication_identifier":{"isbn":["978-3-8440-6720-0"]},"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"}],"author":[{"last_name":"Josupeit","full_name":"Josupeit, Stefan","first_name":"Stefan"}],"supervisor":[{"first_name":"Hans-Joachim","full_name":"Schmid, Hans-Joachim","id":"464","last_name":"Schmid"}],"volume":11,"date_updated":"2022-01-06T06:56:34Z","status":"public","type":"dissertation","series_title":"Forschungsberichte des Direct Manufacturing Research Centers","user_id":"71545","department":[{"_id":"150"},{"_id":"624"},{"_id":"219"}],"_id":"24753"},{"_id":"6543","project":[{"_id":"53","name":"TRR 142"},{"_id":"54","name":"TRR 142 - Project Area A"},{"_id":"58","name":"TRR 142 - Subproject A1"}],"department":[{"_id":"230"}],"user_id":"49428","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"],"article_type":"original","language":[{"iso":"eng"}],"publication":"Applied Optics","type":"journal_article","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."}],"status":"public","publisher":"OSA","date_updated":"2022-01-06T07:03:11Z","volume":56,"date_created":"2019-01-09T10:06:44Z","author":[{"last_name":"Mundry","full_name":"Mundry, J.","first_name":"J."},{"first_name":"J.","last_name":"Lohrenz","full_name":"Lohrenz, J."},{"first_name":"M.","full_name":"Betz, M.","last_name":"Betz"}],"title":"Tunable femtosecond near-IR source by pumping an OPA directly with a 90 MHz Yb:fiber source","doi":"10.1364/AO.56.003104","issue":"11","year":"2017","intvolume":" 56","page":"3104-3108","citation":{"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} }","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.","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","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.","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."}}]