@inproceedings{28440,
  author       = {{Triebus, Marcel and Reitz, Alexander and Grydin, Olexandr and Grenz, Julian and Schneidt, Andreas and Erhardt, Rüdiger and Tröster, Thomas and Schaper, Mirko}},
  booktitle    = {{13th European LS-DYNA Conference 2021}},
  location     = {{Ulm}},
  title        = {{{Forming Simulation of Tailored Press Hardened Parts}}},
  year         = {{2021}},
}

@book{28461,
  author       = {{Tröster, Thomas and Pfeifer, Florian and Nacke, Bernard and Dietrich, André}},
  isbn         = {{978-3-96780-002-9 }},
  publisher    = {{Forschungsvereinigung Stahlanwendung e.V.}},
  title        = {{{Großserientaugliche induktive Platinenerwärmung für den Warmformprozess}}},
  volume       = {{P1038}},
  year         = {{2021}},
}

@inproceedings{21442,
  author       = {{Tinkloh, Steffen Rainer and Wu, Tao and Tröster, Thomas and Niendorf, Thomas}},
  keywords     = {{Micromechanics, Fast Fourier Transform (FFT), Reduced Order Modelling, Homogenization}},
  title        = {{{Development of a submodel technique for FFT-based solvers in micromechanical analysis}}},
  year         = {{2021}},
}

@inproceedings{20857,
  author       = {{Camberg, Alan Adam and Tröster, Thomas and Latuske, Clemens}},
  location     = {{Wolfsburg}},
  publisher    = {{Springer}},
  title        = {{{Development of a hybrid crash-relevant car body component with load-adapted thickness properties: Design, manufacturing and testing}}},
  doi          = {{https://doi.org/10.1007/978-3-662-62924-6_28}},
  year         = {{2021}},
}

@inproceedings{20858,
  author       = {{Camberg, Alan Adam and Tröster, Thomas and Wingenbach, Nils and Hielscher, Christian  and Grenz, Julian}},
  location     = {{Wolfsburg}},
  publisher    = {{Springer}},
  title        = {{{A new numerical method for potential anaylsis and design of hybrid components from full vehicle simulations: Implementation and component design}}},
  doi          = {{https://doi.org/10.1007/978-3-662-62924-6_30}},
  year         = {{2021}},
}

@article{22518,
  author       = {{Triebus, Marcel and Gierse, Jan and Marten, Thorsten and Tröster, Thomas}},
  issn         = {{1757-8981}},
  journal      = {{IOP Conference Series: Materials Science and Engineering}},
  location     = {{Virtual - Stuttgart}},
  publisher    = {{IOP Publishing Ltd}},
  title        = {{{A new Device for Determination of Forming-Limit-Curves under Hot-Forming Conditions}}},
  doi          = {{10.1088/1757-899x/1157/1/012052}},
  year         = {{2021}},
}

@techreport{29807,
  author       = {{Linnig, Caterina and Tröster, Thomas}},
  publisher    = {{Deutsche Bundesstiftung Umwelt (DBU)}},
  title        = {{{Entwicklung eines neuartigen Reinigungsverfahrens für recycelte Kohlenstofffasern}}},
  year         = {{2021}},
}

@article{24131,
  abstract     = {{<jats:p>Glass/carbon fiber reinforced plastic (GFRP/CFRP) and hybrid components have attracted increasing attention in lightweight applications. However, residual stresses induced in the manufacturing process of these components can result in warpage and, eventually, negatively affect the mechanical performance of the composite structures. In the present work, GFRP, CFRP, GFRP/steel and CFRP/steel hybrid components were manufactured through the prepreg-press-technology always employing the same process parameters. The residual stresses of these components were measured through the hole drilling method (HDM), based on an adequate formalism to evaluate the residual stresses for orthotropic materials including the calculation of the calibration coefficients via finite element analysis (FEA). In FEA, the real material lay-up and mechanical properties of the samples were considered. The warpage induced by residual stresses was measured after the samples were removed from the tool. The measured residual stresses and warpage of four different types of samples were compared and results were analyzed in depth. The results obtained can be extended to other hybrid materials and even could be used for designing multi-stable laminates for application in adaptive structures. Moreover, the effects of the drilling process parameters of HDM, e.g., the drilling speed, the drilling increment and the zero-depth setting, on the resulting residual stresses of GFRP were investigated. The reliability of residual stress measurements in GFRP using HDM was validated through mechanical bending tests. The conclusions concerning the choice of optimal drilling parameters for GFRP could be directly applied for other types of samples considered in the present work.</jats:p>}},
  author       = {{Wu, Tao and Tinkloh, Steffen Rainer and Tröster, Thomas and Zinn, Wolfgang and Niendorf, Thomas}},
  issn         = {{2075-4701}},
  journal      = {{Metals}},
  title        = {{{Measurement and Analysis of Residual Stresses and Warpage in Fiber Reinforced Plastic and Hybrid Components}}},
  doi          = {{10.3390/met11020335}},
  year         = {{2021}},
}

@article{21064,
  author       = {{Tinkloh, Steffen Rainer and Wu, Tao and Tröster, Thomas and Niendorf, Thomas}},
  issn         = {{2075-4701}},
  journal      = {{Metals}},
  title        = {{{The Effect of Fiber Waviness on the Residual Stress State and Its Prediction by the Hole Drilling Method in Fiber Metal Laminates: A Global-Local Finite Element Analysis}}},
  doi          = {{10.3390/met11010156}},
  year         = {{2021}},
}

@inproceedings{21726,
  author       = {{Triebus, Marcel and Tröster, Thomas}},
  booktitle    = {{9th NRW Nano Conference - Innovations in Materials and Applications}},
  location     = {{Web}},
  title        = {{{HyOpt - Optimization-Based Development of Hybrid Materials}}},
  year         = {{2021}},
}

@article{33895,
  abstract     = {{<jats:p>Heat-assisted forming processes are becoming increasingly important in the manufacturing of sheet metal parts for body-in-white applications. However, the non-isothermal nature of these processes leads to challenges in evaluating the forming limits, since established methods such as Forming Limit Curves (FLCs) only allow the assessment of critical forming strains for steady temperatures. For this reason, a temperature-dependent extension of the well-established GISSMO (Generalized Incremental Stress State Dependent Damage Model) fracture indicator framework is developed by the authors to predict forming failures under non-isothermal conditions. In this paper, a general approach to combine several isothermal FLCs within the temperature-extended GISSMO model into a temperature-dependent forming limit surface is investigated. The general capabilities of the model are tested in a coupled thermo-mechanical FEA using the example of warm forming of an AA5182-O sheet metal cross-die cup. The obtained results are then compared with state of the art of evaluation methods. By taking the strain and temperature path into account, GISSMO predicts greater drawing depths by up to 20% than established methods. In this way the forming and so the lightweight potential of sheet metal parts can by fully exploited. Moreover, the risk and locus of failure can be evaluated directly on the part geometry by a contour plot. An additional advantage of the GISSMO model is the applicability for low triaxialities as well as the possibility to predict the materials behavior beyond necking up to ductile fracture.</jats:p>}},
  author       = {{Camberg, Alan Adam and Erhart, Tobias and Tröster, Thomas}},
  issn         = {{1996-1944}},
  journal      = {{Materials}},
  keywords     = {{General Materials Science}},
  number       = {{17}},
  publisher    = {{MDPI AG}},
  title        = {{{A Generalized Stress State and Temperature Dependent Damage Indicator Framework for Ductile Failure Prediction in Heat-Assisted Forming Operations}}},
  doi          = {{10.3390/ma14175106}},
  volume       = {{14}},
  year         = {{2021}},
}

@phdthesis{37579,
  abstract     = {{Leichtmetalle mit einem breiten Eigenschaftsspektrum gewährleisten die Realisierung ressourcenschonender Produkte und ermöglichen die Intensivierung sortenreiner Kreislaufwirtschaften. Die vorliegende Arbeit untersucht einen wärmeunterstützten Ansatz zur Erhöhung der Formgebungsgrenzen stark kaltverfestigter AlMg4,5 Blechwerkstoffe bei gleichzeitiger Beschränkung des Festigkeitsverlustes durch Erholungseffekte. Experimentelle Untersuchungen stellen eine wissenschaftlich fundierte Erkenntnisbasis über die werkstofftechnischen Wirkzusammenhänge des untersuchten Prozesses dar. Gepaart mit an realen Bauteilgeometrien validierten numerischen Simulationsmodellen legt diese Arbeit einen methodischen Grundstein für die industrielle Umsetzung des hier untersuchten Blechumformprozesses. Die erzielte mittlere Dehngrenze des exemplarisch untersuchten Bauteils übersteigt die Dehngrenze eines konventionellen AlMg4,5 Werkstoffes um 190 %. Mit 320 MPa entspricht sie dem Festigkeitsniveau des walzharten Blechhalbzeuges im Lieferzustand, ein Wert, der nach dem aktuellen Stand der Technik auf Bauteilebene ausschließlich mit aushärtbaren AlMgSi Legierungen darstellbar ist. }},
  author       = {{Camberg, Alan Adam}},
  isbn         = {{978-3-8440-8271-5}},
  keywords     = {{Aluminium, Blechumformung, AlMg, Materialmodellierung, Duktiles Versagen, Halbwarmumformung, Automobil, Leichtbau, Uni-Alloy, 5000-Serie, 5182, GISSMO}},
  pages        = {{230}},
  publisher    = {{Shaker Verlag}},
  title        = {{{Festigkeitssteigerung von Aluminiumblechformteilen der 5000-Serie durch Erweiterung der Formgebungsgrenzen stark kaltverfestigter Ausgangswerkstoffe}}},
  doi          = {{10.2370/9783844082715}},
  volume       = {{2021,52}},
  year         = {{2021}},
}

@phdthesis{37586,
  abstract     = {{Der Verbau von Sheet Moulding Compounds im automobilen Außenhautbereich führt in der industriellen Praxis regelmäßig zu abnehmenden Direktläuferquoten in der Technologie Oberfläche, denn neben bekannten Lackierfehlern ergeben sich auch werkstoff-spezifische Oberflächendefekte, welche einen Bauteilwechsel bedingen. Die hier vorliegende Arbeit soll einen aktiven Beitrag zur Reduzierung von Ausschuss und Nacharbeit entlang der Lackierprozesskette leisten. Zu Beginn werden die erfolgskritischen Oberflächendefekte identifiziert und die zugehörigen Fehlerursachen ermittelt, ehe anschließend die Entwicklung der Fehlstellengrößen in Folge der Temperaturbelastung während der Trocknerdurchfahrten untersucht wird. Ferner soll die Auswirkung einer zusätzlich applizierten Oberflächengrundierung auf die Fehlerhäufigkeit sowie die Oberflächengüte im decklackierten Zustand geprüft werden. Als weitere Möglichkeit zur Problemlösung wird eine in den Prozessablauf integrierte Qualitätskontrolle gesehen, weshalb in dieser Arbeit ebenso die Eignung bekannter zerstörungsfreier Prüfmethoden für die präventive Fehlererkennung überprüft und ein zweistufiges Prüfkonzept erarbeitet wird. Das Aufzeigen möglicher Handlungsalternativen sowie die kostentechnische Gegenüberstellung der verschiedenen Anbauvarianten runden die Arbeit ab.}},
  author       = {{Huber, Johannes}},
  isbn         = {{978-3-8440-8222-7}},
  keywords     = {{Sheet Moulding Compounds, SMC, Online-Lackierung}},
  pages        = {{194}},
  publisher    = {{Shaker Verlag}},
  title        = {{{Beitrag zur Reduzierung der Fehlerhäufigkeit bei der Online-Lackierung von SMC-Außenhautbauteilen}}},
  volume       = {{2021,50}},
  year         = {{2021}},
}

@phdthesis{37584,
  abstract     = {{Im Rahmen dieser Arbeit wurde ein neuartiger Achsträger in hybrider Bauweise entwickelt und untersucht. Dieser besteht aus einer metallischen Oberschalenstruktur und einer mit Rippen ausgeformten glasfaserverstärkten thermoplastischen Unterschale (GMT), welche zur Einstellung der optimalen Steifigkeit dient. Die Rippen und Unterschale werden hierzu in einem Fließpressverfahren entweder gemeinsam als ein Bauteil oder als separate Einzelteile hergestellt. Durch den lokalen Einsatz von Faserverbundwerkstoffen in der Unterschale und der Rippenstruktur wird ein signifikanter Gewichtsvorteil gegenüber einer Referenzstruktur aus Stahl erzielt. Durch die Verwendung des GMT-Unterbodenschutzes konnten zudem die akustischen Eigenschaften des Fahrwerks hinsichtlich der Dämpfung positiv beeinflusst werden.
Die hohen Anforderungen bzgl. Steifigkeit, Festigkeit und Beständigkeit der sicherheitsrelevanten Fahrwerkskomponente konnten unter Einhaltung des Bauraums erfüllt werden. Gleichzeitig konnte das Gesamtgewicht der Komponente im Vergleich zur klassischen Referenzstruktur um 30 % reduziert werden. }},
  author       = {{Pöhler, Simon}},
  isbn         = {{978-3-8440-8210-4}},
  keywords     = {{hybrider Achsträger, Leichtbau, Hybridsysteme}},
  pages        = {{124}},
  publisher    = {{Shaker Verlag}},
  title        = {{{Konzeptionierung und Auslegung eines Vorderachsträgers in hybrider Leichtbauweise im C-Segment}}},
  volume       = {{2021,49}},
  year         = {{2021}},
}

@article{24541,
  abstract     = {{<jats:p>The mechanical properties of joined structures are determined considerably by the chosen joining technology. With the aim of providing a method that enables a faster and more profound decision-making in the spatial distribution of joining points during product development, a new method for the load path analysis of joining points is presented. For an exemplary car body, the load type in the joining elements, i.e. pure tensile, shear and combined tensile-shear loads, is determined using finite element analysis (FEA). Based on the evaluated loads, the resulting load paths in selected joining points are analyzed using a 2D FE-model of a clinching point. State of the art methods for load path analysis are dependent on the selected coordinate system or the existing stress state. Thus, a general statement about the load transmission path is not possible at this time. Here, a novel method for the analysis of load paths is used, which is independent of the alignment of the analyzed geometry. The basic assumption of the new load path analysis method was confirmed by using a simple specimen with a square hole in different orientations. The results presented here show a possibility to display the load transmission path invariantly. In further steps, the method will be extended for 3D analysis and the investigation of more complex assemblies. The primary goal of this methodical approach is an even load distribution over the joining elements and the component. This will provide a basis for future design approaches aimed at reducing the number of joining elements in joined structures.</jats:p>}},
  author       = {{Steinfelder, Christian and Martin, Sven and Brosius, Alexander and Tröster, Thomas}},
  issn         = {{1662-9795}},
  journal      = {{Key Engineering Materials}},
  pages        = {{73--80}},
  title        = {{{Load Path Transmission in Joining Elements}}},
  doi          = {{10.4028/www.scientific.net/kem.883.73}},
  year         = {{2021}},
}

@article{24548,
  author       = {{Martin, Sven and Tröster, Thomas}},
  journal      = {{ESAFORM 2021}},
  title        = {{{Joint point loadings in car bodies – the influence of manufacturing tolerances and scatter in material properties}}},
  doi          = {{10.25518/esaform21.3801}},
  year         = {{2021}},
}

@inproceedings{26994,
  author       = {{Stallmeister, Tim and Martin, Sven and Marten, Thorsten and Tröster, Thomas}},
  location     = {{Bad Nauheim}},
  title        = {{{Experimental investigation on lightweight potentials of fiber-metal-laminates for automotive battery cases}}},
  year         = {{2021}},
}

@article{24009,
  abstract     = {{<jats:p>Heat-assisted forming processes are becoming increasingly important in the manufacturing of sheet metal parts for body-in-white applications. However, the non-isothermal nature of these processes leads to challenges in evaluating the forming limits, since established methods such as Forming Limit Curves (FLCs) only allow the assessment of critical forming strains for steady temperatures. For this reason, a temperature-dependent extension of the well-established GISSMO (Generalized Incremental Stress State Dependent Damage Model) fracture indicator framework is developed by the authors to predict forming failures under non-isothermal conditions. In this paper, a general approach to combine several isothermal FLCs within the temperature-extended GISSMO model into a temperature-dependent forming limit surface is investigated. The general capabilities of the model are tested in a coupled thermo-mechanical FEA using the example of warm forming of an AA5182-O sheet metal cross-die cup. The obtained results are then compared with state of the art of evaluation methods. By taking the strain and temperature path into account, GISSMO predicts greater drawing depths by up to 20% than established methods. In this way the forming and so the lightweight potential of sheet metal parts can by fully exploited. Moreover, the risk and locus of failure can be evaluated directly on the part geometry by a contour plot. An additional advantage of the GISSMO model is the applicability for low triaxialities as well as the possibility to predict the materials behavior beyond necking up to ductile fracture.</jats:p>}},
  author       = {{Camberg, Alan Adam and Erhart, Tobias and Tröster, Thomas}},
  issn         = {{1996-1944}},
  journal      = {{Materials}},
  title        = {{{A Generalized Stress State and Temperature Dependent Damage Indicator Framework for Ductile Failure Prediction in Heat-Assisted Forming Operations}}},
  doi          = {{10.3390/ma14175106}},
  year         = {{2021}},
}

@article{23431,
  abstract     = {{As an effective and accurate method for modelling composite materials, mean-field homogenization is still not well studied in modelling non-linear and damage behaviours of UD composites. Investigated micro FE-simulations show that the matrix of UD composites exhibits different average plastic behaviour, named as average asymmetric matrix plasticity (AAMP), when the composite behaves different under shear, longitudinal and transverse loadings. In this study, a non-linear mean-field debonding model (NMFDM) combining a mean-field model and a fibre–matrix interface debonding model, is developed to simulate UD composites under consideration of AAMP, fibre–matrix interface damage and progressive failure. AAMP is considered by using so-called stress mode factor, which is expressed in terms of basic invariants of the matrix deviatoric stress tensor and is used as an indicator for detection of differences in the loading mode. The material behaviour of UD composites with imperfect interface is assumed identical as for perfect interface and stiffness reduced fibres. Progressive failure criteria are established with consideration of fibre breakage and matrix crack for different fibre orientations. As a representative example for the NMFDM, a C30/E201 UD composite is studied. To verify the model, experiments are conducted on polymers, carbon fibres and UD CFRPs. Finally, the model is applied to simulate a perforated CFRP laminate, which shows excellent prediction ability on deformation, debonding and progressive failure.}},
  author       = {{Cheng, C. and Wang, Z. and Jin, Z. and Ju, X. and Schweizer, Swetlana and Tröster, Thomas and Mahnken, Rolf}},
  issn         = {{1359-8368}},
  journal      = {{Composites Part B: Engineering}},
  keywords     = {{Non-linear mean-field homogenization Average asymmetric plasticity of matrix Fibre–matrix interface debonding Micro-mechanical FE-simulation Progressive failure}},
  title        = {{{Non-linear mean-field modelling of UD composite laminates accounting for average asymmetric plasticity of the matrix, debonding and progressive failure}}},
  doi          = {{10.1016/j.compositesb.2021.109209}},
  volume       = {{224}},
  year         = {{2021}},
}

@article{29293,
  author       = {{Martin, Sven and Schütte, Jan and Bäumler, C. and Sextro, Walter and Tröster, Thomas}},
  issn         = {{2666-3597}},
  journal      = {{Forces in Mechanics}},
  publisher    = {{Elsevier BV}},
  title        = {{{Identification of joints for a load-adapted shape in a body in white using steady state vehicle simulations}}},
  doi          = {{10.1016/j.finmec.2021.100065}},
  volume       = {{6}},
  year         = {{2021}},
}