TY - GEN A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars A1 - Gerstenberger, Colin A1 - Kroll, Lothar T1 - Dimensioning of Punctiform Metal-Composite Joints: A Section-Force Related Failure Criterion T2 - Open Journal of Composite Materials N2 - Reliable line production processes and simulation tools play a central role for the structural integration of thermoplastic composites in advanced lightweight constructions. Provided that material-adapted joining technologies are available, they can be applied in heavy-duty multi-material designs (MMD). A load-adapted approach was implemented into the new fully automatic and faulttolerant thermo mechanical flow drill joining (FDJ) concept. With this method it is possible to manufacture reproducible high strength FRP/metal-joints within short cycle times and without use of extra joining elements for the first time. The analysis of FDJ joints requires a simplified model of the joint to enable efficient numerical simulations. The present work introduces a strategy in modeling a finite-element based analogous-approach for FDJ-joints with glass fiber reinforced polypropylene and high-strength steel. Combined with a newly developed section-force related failure criterion, it is possible to predict the fundamental failure behavior in multi-axial stress states. The functionality of the holistic approach is illustrated by a demonstrator that represents a part of a car body-in-white structure. The comparison of simulated and experimentally determined failure loads proves the applicability for several combined load cases. KW - Composites KW - Multi-Material-Design KW - Hybrid KW - Joining KW - Failure Criterion KW - FDJ Joint Y1 - 2014 U6 - https://doi.org/10.4236/ojcm.2014.43018 SN - 2164-5655 VL - 4 IS - 3 SP - 157 EP - 172 ER - TY - GEN A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars A1 - Kroll, Lothar T1 - New Joining Technology for Optimized Metal/Composite Assemblies T2 - Journal of Engineering N2 - The development of a new joining technology, which is used to manufacture high strength hybrid constructions with thermoplastic composites (FRP) and metals, is introduced. Similar to natural regulation effects at trees, fibers around the FRP joint become aligned along the lines of force and will not be destroyed by the joining process. This is achieved by the local utilization of the specific plastic flow properties of the FRT and metal component. Compared with usual joining methods—such as flow drill screws, blind and self-piercing rivets—noticeably higher tensile properties can be realized through the novel process management. The load-bearing capability increasing effect could be proved on hybrid joints with hot-dip galvanized steel HX420LAD and orthotropic glass—as well as carbon—fiber reinforced plastics. The results, which were determined in tensile-shear and cross-shear tests according to DIN EN ISO 14273 and DIN EN ISO 14272, are compared with holding loads of established joining techniques with similar joining point diameter and material combinations. Y1 - 2014 U6 - https://doi.org/doi:10.1155/2014/958501 SN - 2314-4912 SP - 958501 ER - TY - GEN A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars A1 - Kroll, Lothar T1 - Prozess- und festigkeitsoptimiertes Multi-Material-Design mit thermoplastischen Faserverbunden und Metallen T2 - Konstruktion Zeitschrift für Produktentwicklung und Ingenieur-Werkstoffe Y1 - 2014 SN - 0720-5953 IS - 11-12 SP - 75 EP - 79 ER - TY - GEN A1 - Kroll, Lothar A1 - Ulke-Winter, Lars A1 - Seidlitz, Holger T1 - CFRP coupling for towing and shunting trains T2 - Plastics : the global application medium Y1 - 2013 SN - 2195-4577 N1 - Article code: KGB VL - 1 IS - 3-4 SP - S. 7 ER - TY - CHAP A1 - Seidlitz, Holger A1 - Nendel, Wolfgang A1 - Kroll, Lothar A1 - Ulke-Winter, Lars T1 - Energie- und ressourceneffiziente Leichtbaufügezange zur Herstellung von Mehrkomponentenbauteilen in Mischbauweise T2 - Zentrales Innovationsprogramm Mittelstand (ZIM), Fachworkshop Elektromobilität, Berlin, 2012 KW - energieeffizient KW - Leichtbau KW - Mischbauweise Y1 - 2012 UR - http://www.zim-bmwi.de/veranstaltungen/dateien/vortraege/3_1_Seidlitz_TU%20Chemnitz.pdf ER - TY - GEN A1 - Kolshorn, Kay-Uwe A1 - Kroll, Lothar A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars A1 - Müller, S. A1 - Czech, Adam A1 - Hoyer, K.-H. A1 - Grothaus, R. T1 - Erste CFK-Kupplung für Schienenfahrzeuge T2 - Fachzeitschrift Lightweight Design Y1 - 2012 SN - 1865-4819 SN - 2192-8738 IS - 5 SP - 38 EP - 43 ER - TY - GEN A1 - Seidlitz, Holger A1 - Czech, Adam A1 - Ulke-Winter, Lars A1 - Kroll, Lothar T1 - Thermomechanisches Ausformfügen für thermoplastische FVK T2 - Lightweight Design Y1 - 2011 U6 - https://doi.org/10.1365/s35725-011-0027-6 SN - 2192-8738 SN - 1865-4819 VL - 4 IS - 3 SP - 16 EP - 23 ER - TY - GEN A1 - Kroll, Lothar A1 - Ulke-Winter, Lars A1 - Seidlitz, Holger T1 - Der Trick: CFK statt Stahl T2 - Technische Rundschau. Das Schweizer Industriemagazin Y1 - 2013 UR - http://www.technische-rundschau.ch/site/assets/files/12587/062-063_tr0413.pdf SN - 1023-0823 VL - 105 IS - 4 SP - 62 EP - 63 ER - TY - GEN A1 - Gerstenberger, Colin A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars A1 - Kroll, Lothar ED - Gehde, Michael ED - Wagenknecht, Udo ED - Bloß, Peter T1 - Dimensionierung thermomechanisch ausgeformter Verbindungen T2 - Technomer 2013, 23. Fachtagung über Verarbeitung und Anwendung von Polymeren, 14. bis 15. November 2013 Y1 - 2013 SN - 978-3-939382-11-9 SP - S. 168 PB - Inst. für Fördertechnik und Kunststoffe [u.a.] CY - Chemnitz ER - TY - CHAP A1 - Seidlitz, Holger A1 - Czech, Adam A1 - Ulke-Winter, Lars A1 - Kroll, Lothar T1 - Thermomechanisches Ausformfügen für thermoplastische FVK T2 - Jahrbuch lighweightdesign - JOT - adhäsion: Top-Innovationen aus dem Leichtbau, der Oberflächen- und Klebtechnik Y1 - 2013 SN - 978-3-658-00985-4 SN - 3-658-00985-3 SP - 3 EP - 11 ER - TY - GEN A1 - Seidlitz, Holger A1 - Kroll, Lothar A1 - Ulke-Winter, Lars T1 - Heavy-Duty Lightweight Structures: Force Flux-Maintaining Spot Connections T2 - Kunststoffe International KW - Lightweight Structures Y1 - 2011 SN - 1862-4243 VL - 2011 IS - 3 SP - 25 EP - 28 ER - TY - GEN A1 - Kroll, Lothar A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars ED - Wielage, Bernhard T1 - Herstellung hochbelasteter Leichtbaustrukturen in Mischbauweise T2 - Tagungsband zum 18. Symposium Verbundwerkstoffe und Werkstoffverbunde, Chemnitz, 30.03. bis 01.04.2011 Y1 - 2011 SN - 978-3-00-033801-4 SP - 360 EP - 365 PB - IWW CY - Chemnitz ER - TY - GEN A1 - Seidlitz, Holger A1 - Kroll, Lothar A1 - Ulke-Winter, Lars T1 - Kraftflussgerechte Punktverbindungen - Hochbelastete Leichtbaustrukturen T2 - Zeitschrift Kunststoffe KW - Verbindungstechnik KW - Niettechnik KW - Verbundwerkstoffe KW - Werkstoffverbunde Y1 - 2011 SN - 0023-5563 VL - 101 IS - 3 SP - 50 EP - 53 ER - TY - GEN A1 - Kroll, Lothar A1 - Czech, Adam A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars A1 - Müller, Sascha ED - Wielage, Bernhard T1 - Mechanisches Verhalten von CFK-Scheiben mit variabelaxialem Faserverlauf auf Basis der Tailored-Fibre-Placement-Technologie unter Bolzenbelastung T2 - Tagungsband zum 18. Symposium Verbundwerkstoffe und Werkstoffverbunde, Chemnitz, 30.03. bis 01.04.2011 Y1 - 2011 SN - 978-3-00-033801-4 SP - 585 EP - 590 PB - IWW CY - Chemnitz ER - TY - GEN A1 - Ulke-Winter, Lars A1 - Kroll, Lothar A1 - Seidlitz, Holger T1 - Discrete optimization of laminate stacking sequence according to failure criteria T2 - Recent Developments in Artificial Intelligence Methods, AI-METH 2009 Y1 - 2009 SN - 83-60759-15-4 SP - 57 EP - 58 PB - Silesian University of Technology CY - Gliwice ER - TY - GEN A1 - Seidlitz, Holger A1 - Kroll, Lothar A1 - Ulke-Winter, Lars ED - Gehde, Michael ED - Wagenknecht, Udo ED - Bloß, Peter T1 - Faserverbundgerechte Krafteinleitungssysteme für Hochleistungskomponenten in Mischbauweise T2 - Technomer 2009, 21. Fachtagung über Verarbeitung und Anwendung von Polymeren, Chemnitz, 2009, Plenum, Vorträge, Posterbeiträge, Kurzfassungen Y1 - 2009 SN - 978-3-939382-09-6 SP - S. 55 PB - Institut für Allgemeinen Maschinenbau und Kunststofftechnik, Techn. Univ. [u.a.] CY - Chemnitz ER - TY - GEN A1 - Seidlitz, Holger A1 - Kroll, Lothar A1 - Ulke-Winter, Lars A1 - Schumann, Tilo ED - Meynerts, Peter T1 - Krafteinleitungssysteme bei hybriden Hochleistungskomponenten T2 - Innovation mit textilen Strukturen, 12. Chemnitzer Textiltechnik-Tagung, 30. September und 1. Oktober 2009 Y1 - 2009 SN - 978-3-9812554-3-0 SP - 220 EP - 230 PB - Institut für Allgemeinen Maschinenbau und Kunststofftechnik [u.a.] CY - Chemnitz ER - TY - GEN A1 - Seidlitz, Holger A1 - Kroll, Lothar A1 - Ulke-Winter, Lars T1 - Kraftflussgerechte Verbindungstechniken für Hochleistungskomponenten in Mischbauweise T2 - Leichtbau-Kongress, Salzburg, 23. - 25. Juni 2009, EuroLITE, Internationale Fachmesse für Leichtbaukonstruktion Y1 - 2009 PB - Hochschule CY - Landshut ER - TY - GEN A1 - Seidlitz, Holger A1 - Kroll, Lothar A1 - Ulke-Winter, Lars T1 - Load adjusted joining technology for Composite-Metal Hybrids T2 - Recent Developments in Artificial Intelligence Methods, AI-METH 2009 Y1 - 2009 SN - 83-60759-15-4 U6 - https://doi.org/10.1155/2014/958501 SP - 51 EP - 52 PB - Silesian University of Technology CY - Gliwice ER - TY - CHAP A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars A1 - Kuke, Felix A1 - Ost, Lucas ED - Kumar, Sanjeev T1 - Material and Load Path Appropriate Joining Techniques for FRP/Metal Hybrid Structures T2 - Welding - Materials, Fabrication Processes, and Industry 5.0 N2 - Fiber-reinforced plastics (FRP) offer great lightweight construction potential. However, the anisotropic high-performance materials can only be fully utilized through the development of material-specific joining processes. A literature study shows that conventional methods such as screwing, riveting and bolting are unsuitable, since the load-bearing fibers are severed in the joining region. This leads to high-stress concentrations. To reduce these, a method is presented in which through holes are created in thermoplastic FRP by reorienting the fibers in this area around the point of disruption in accordance with the load path. For this purpose, the polymer matrix is softened locally by applying heat and penetrated with a needle or mandrel. Based on this, a technology for material-specific joining of FRP and metals has been developed in the form of thermomechanical flow drill joining. In this process, a mandrel forms a bush from the metal component and deflects the fibers of the locally softened organic sheet to suit the material. Cold metal transfer (CMT) pin welding is presented as another fully automatable joining process. In this method, the softened plastic component is penetrated with the welding wire, displacing the fibers in the joining area and realigning them to suit the load path. KW - fiber-reinforced plastics KW - thermomechanical flow drill joining KW - cold metal transfer pin welding KW - load path KW - fiber orientation Y1 - 2023 UR - https://www.intechopen.com/books/1002588 SN - 978-1-83769-870-7 SN - 978-1-83769-872-1 U6 - https://doi.org/10.5772/intechopen.1002239 PB - IntechOpen CY - London ET - 1. Auflage ER - TY - GEN A1 - Rüppel, Gernot Wilhelm A1 - Dorn, Oliver Niklas A1 - Kuke, Felix A1 - Ulke-Winter, Lars A1 - Seidlitz, Holger T1 - Optical tape detection using an IR camera to create a digital twin of rotationally symmetrical wet-wound FRP components T2 - Journal of Engineering 360 N2 - Wet-winding is used to manufacture rotationally symmetrical components such as pipes and pressure vessels, as well as non-rotationally symmetrical components like T-connectors. During this process, a resin-impregnated fiber (e.g., glass or carbon fiber) is wound around a core. The winding pattern influences the mechanical properties, including stiffness and strength of the component, and is optimized based on the expected loads. In practice, however, factors such as tape tension and resin content can cause deviations from the predefined winding pattern. This paper proposes a measuring system utilizing an IR-camera to record the winding pattern during production. The collected data is processed and converted into a digital twin for further analysis. KW - digital twin KW - wet winding KW - IR-Camera KW - optical fiber detection KW - optical tape detection Y1 - 2024 U6 - https://doi.org/10.5604/01.3001.0054.8851 SN - 3071-7507 VL - 1 (2024) IS - 1/24 SP - 46 EP - 57 PB - Index Copernicus ER - TY - GEN A1 - Ost, Lucas A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars A1 - Kuke, Felix T1 - Development of a spherical high‐pressure tank for hydrogen storage in mobile and stationary applications T2 - Energy Technology N2 - In the sub‐project Mukran of the BMBF‐funded flagship project TransHyDE, spherical and nearly spherical‐shaped (isotensoids with short cylindrical spacer) high‐pressure tanks are developed for hydrogen storage. This article presents the planned work of the Chair of Polymer‐based Lightweight Design at the BTU Cottbus–Senftenberg and the research division PYCO at the Fraunhofer IAP. The research topics include the fiber‐compatible design of the liners, the rule‐based optimization of the layer structure of the load‐bearing overwrap made of carbon fiber‐reinforced plastic, the development of a fiber placement strategy, and the integration of the tanks into a frame as a mobile storage solution. KW - CFRP pressure vessel KW - hydrogen KW - pressure vessel KW - spherical pressure vessel Y1 - 2024 U6 - https://doi.org/10.1002/ente.202300942 SN - 2194-4288 PB - Wiley ER - TY - GEN A1 - Kepir, Yusuf A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars A1 - Felix, Kuke T1 - Lightweight heat exchanger design using graphene-reinforced ceramics : a comparative study of dimensional and material effects T2 - Proceedings of the 4th International Online Conference on Materials, 3–6 November 2025 N2 - In high-temperature environments, heat exchangers require lightweight designs, high thermal resistance, and high effectiveness. Graphene-reinforced ceramic matrix composites (G-CMC) offer promising thermal properties for such applications. This study investigates the effectiveness changes of a block-type heat exchanger made of G-CMC, depending on the length and design, leveraging the potential of 3D printing in the production of complex geometries. KW - Ceramic matrix composite KW - Heat exchanger KW - Numerical analysis KW - Heat transfer KW - Thermal effectiveness Y1 - 2025 UR - https://sciforum.net/paper/view/25988 PB - MDPI CY - Basel ER - TY - GEN A1 - Kepir, Yusuf A1 - Seidlitz, Holger A1 - Ulke-Winter, Lars A1 - Kuke, Felix T1 - Geometric optimization and advanced material integration for enhanced thermal performance of compact cross-flow heat exchangers in high-temperature applications T2 - Proceedings of the 6th International Electronic Conference on Applied Sciences, 9–11 December 2025 N2 - Heat exchangers used in high-temperature environments require lightweight designs with high thermal resistance and efficiency. This study numerically investigates the thermal performance of a multi-channel compact cross-flow heat exchanger, focusing on geometric configurations and material selection. KW - Compact heat exchanger KW - Geometric optimization KW - Thermal performance KW - Turbulence promoters KW - Lightweight design Y1 - 2025 UR - https://sciforum.net/paper/view/27631 PB - MDPI CY - Basel ER -