@inproceedings{52688, author = {{Bähr, Philipp and Striewe, Marius and Meschut, Gerson and Sommer, Silke and Hein, David}}, booktitle = {{13. Kolloquium: Gemeinsame Forschung in der Mechanischen Fügetechnik}}, title = {{{Ersatzmodellentwicklung zur Berücksichtigung der lokalen Fügeelementkinematik in mechanisch gefügten Verbindungen für die Bauteilauslegung im stahlintensiven Karosseriebau}}}, year = {{2023}}, } @inproceedings{51190, abstract = {{Abstract. Force-displacement measurements and macrosections are commonly used methods to validate numerical models of clinching processes. However, these ex-situ methods often lead to springback of elastic deformations and crack-closing after unloading. In contrast, the in-situ computed tomography (CT) can provide three-dimensional images of the clinching point under loading conditions. So far, the quantity of elastic springback that causes measuring deviations between in- and ex-situ measurements is not determined. In this paper, a method is described to quantitatively compare the results of in-situ CT, ex-situ CT and CT scans of cut specimens, which are prepared for macrosectioning, among each other. The method is applied to a single-lap shear test of two clinched aluminum sheets. Here, the test is conducted to specific process steps, then the specimen is CT scanned in-situ (during loading) and ex-situ (after unloading). Subsequently, the specimens are cut for macrosectioning and CT scanned. Finally, the outer contours and the interfaces of cross section images are determined by digital image analysis and the deviations over the clinching point between ex- and in-situ methods are calculated. }}, author = {{Köhler, Daniel and Kupfer, Robert and Troschitz, Juliane and Gude, Maik}}, booktitle = {{Materials Research Proceedings}}, issn = {{2474-395X}}, publisher = {{Materials Research Forum LLC}}, title = {{{Comparison of ex- and in-situ investigations of clinched single-lap shear specimens}}}, doi = {{10.21741/9781644902417-20}}, year = {{2023}}, } @inbook{51194, author = {{Köhler, Daniel and Stephan, Richard and Kupfer, Robert and Troschitz, Juliane and Brosius, Alexander and Gude, Maik}}, booktitle = {{Lecture Notes in Production Engineering}}, isbn = {{9783031183171}}, issn = {{2194-0525}}, publisher = {{Springer International Publishing}}, title = {{{In-situ Computed Tomography and Transient Dynamic Analysis of a Single-Lap Shear Test with a Composite-Metal Clinch Point}}}, doi = {{10.1007/978-3-031-18318-8_28}}, year = {{2023}}, } @inbook{52689, author = {{Striewe, Marius and Teutenberg, Dominik and Hein, David and Meschut, Gerson and Schmelzle, Lars and Mergheim, Julia and Possart, Gunnar}}, booktitle = {{Klebtechnische Doktorandenseminare 2020 - 2022}}, isbn = {{978-3-96144-139-6}}, location = {{Blankenburg (Harz)}}, title = {{{Methode zur Simulation des temperaturabhängigen Crashverhaltens von strukturellen Klebverbindungen}}}, volume = {{369}}, year = {{2023}}, } @article{46164, author = {{Chudalla, Nick and Meschut, Gerson and Teutenberg, Dominik and Schneider, Miriam and Smart, Dominic }}, journal = {{ adhäsion KLEBEN & DICHTEN}}, number = {{6}}, title = {{{Rechnergestützte Versagensanalyse geklebter Verbindungen}}}, doi = {{https://doi.org/10.1007/s35145-023-1198-x }}, year = {{2023}}, } @inproceedings{50727, abstract = {{Die aktuellen politischen und wirtschaftlichen Rahmenbedingungen zur Reduzierung der CO2-Emissionen sowie der Trend zur flächendeckenden Elektromobilität führen zu einer Vielzahl an neuen Herausforderungen für die Auslegung zukünftiger Fahrzeugkonzepte. Eine besondere Herausforderung ist das durch die Batterie ins Fahrzeug eingebrachte Zusatzgewicht. Hierdurch ergibt sich ein Konflikt zu der bestehenden Kundenerwartung nach einer hohen Reichweite. Durch den umfangreichen Einsatz von höchstfesten Stählen in dünnen Blechdicken im Karosseriebau soll die Reduzierung des Gesamtfahrzeuggewichts vorangetrieben werden. Vor allem im stahlintensiven Leichtbau ist das Widerstandspunktschweißen aufgrund des hohen Automatisierungsgrads, der Prozesssicherheit und der damit verbundenen Wirtschaftlichkeit das dominierende Fügeverfahren. Um Begrenzungen des Bauraums der Karosserie zu begegnen und um den Materialeinsatz im Leichtbau möglichst effizient zu gestalten, werden mehrschnittige Punktschweißverbindungen eingesetzt. Hieraus ergeben sich neue Herausforderungen für die Vorhersage des Trag- und Versagensverhaltens unter Crashbelastung. Dieser Beitrag stellt eine systematische Charakterisierung von 3-Blechverbindungen zur Auffindung von formelmäßigen, empirischen Zusammenhängen zwischen der Festigkeit der Verbindung und den Einflussgrößen vor. Nach der Identifikation geeigneter Einflussgrößen, wie zum Beispiel Blechfestigkeit, Blechanordnung, Blechdickenkombination sowie Belastungsart und Lasteinleitung, auf das Trag- und Versagensverhalten, werden numerische Simulationen durchgeführt, um Ursachen für auftretende Phänomene aus den experimentellen Ergebnissen aufzuklären. Weiterhin wird untersucht, inwieweit das Verhalten von 2-Blechverbindungen auf 3-Blechverbindungen übertragbar ist. Die gefundenen Zusammenhänge sollen schnelle und kostengünstige Abschätzungen über die Festigkeit von 3-Blechbverbindungen ermöglichen. Darüber hinaus werden Ersatzmodelle für die Crashsimulation von 3-Blechverbindungen entwickelt, die recheneffizient für die Sicherheitsbewertung von großen, geschweißten Bauteilen eingesetzt werden können. Dabei sollen insbesondere die Einflüsse des Lastangriffs an jeweils einer oder beiden Fügebenen auf die Festigkeit und Energieabsorption unter verschiedenen Belastungen wie Zug, Scherung sowie Biegung abbildbar sein. }}, author = {{Olfert, Viktoria and Schuster, Lilia and Bähr, Philipp and Hein, David and Meschut, Gerson and Sommer, Silke}}, location = {{Duisburg}}, title = {{{Methodenentwicklung zur Prognose des Crashverhaltens von widerstandspunktgeschweißten 3-Stahlblechverbindungen}}}, year = {{2023}}, } @inproceedings{48585, abstract = {{The use of stainless steel with high strain hardening as material for self-piercing rivets is a promising approach to shorten the manufacturing process. Due to the corrosion resistance of the material and the achieved high strength within the forming process, the heat treatment and the coating can be omitted. As the strength within the rivet material is achieved by cold forming, the strength distribution within the rivet remains intact after the manufacturing process. The aim of the contribution presented is the exploitation of the potential of this strength distribution to improve the performance of the self-piercing rivets. Therefore, the scope of the examination is on the analysis of the influence of the local strength on the deformation behaviour of the rivet during joining. While it is unfeasible to manufacture rivets with any desired strength distribution, numerical simulation offers an efficient opportunity to study the effects of varying local strengths. By using a definable true strain distribution within the rivet as presetting for the simulation, different strength distributions can be modelled. Through the simulation of the joining process, the deformation behaviour of the rivet can be examined. Based on the insights of this analysis, a strength distribution is created that supports the joining of challenging material combinations consisting of high strength steel and aluminium. Finally, the approach is verified by experimental joining tests.}}, author = {{Uhe, Benedikt and Kuball, Clara-Maria and Merklein, Marion and Meschut, Gerson}}, booktitle = {{Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity.}}, editor = {{Mocellin, Katia and Bouchard, Pierre-Olivier and Bigot, Régis and Balan, Tudor}}, pages = {{64--71}}, publisher = {{Springer}}, title = {{{Controlled Rivet Deformation During Self-piercing Riveting Through a Tailored Strength Distribution Within the Rivet Material}}}, doi = {{10.1007/978-3-031-41341-4_8}}, volume = {{3}}, year = {{2023}}, } @article{48584, abstract = {{The sustainability of the manufacturing industry is of special importance to increase the protection of the environment. The production of fasteners like self-piercing rivets, however, is costly, time-consuming and energy-intensive. The heat treatment and the coating, which are mandatory in conventional self-piercing rivets to achieve adequate strength, ductility and corrosion resistance, are especially crucial in this respect. Within this paper, an approach for an increase in the sustainability in fastener production is presented. The use of alternative, high strain hardening stainless steels as rivet material enables a shortening of the process chain, because post treatment of the rivets after they are formed can be omitted. As the change in rivet material and processing causes some issues along the process chain, the focus of this paper is on the holistic evaluation of the challenges within the forming of high strain hardening steel and the impact of the changed rivet properties on the joining result.}}, author = {{Uhe, Benedikt and Kuball, Clara-Maria and Merklein, Marion and Meschut, Gerson}}, issn = {{2504-4494}}, journal = {{Journal of Manufacturing and Materials Processing}}, keywords = {{Industrial and Manufacturing Engineering, Mechanical Engineering, Mechanics of Materials}}, number = {{6}}, publisher = {{MDPI AG}}, title = {{{Increased Sustainability in Fastener Production with the Example of Self-Piercing Rivets}}}, doi = {{10.3390/jmmp7060193}}, volume = {{7}}, year = {{2023}}, } @inproceedings{44220, abstract = {{With regard to environmental protection, the sustainability of production processes is decisive. Mechanical joining technologies like self-piercing riveting are of special importance with regard to realising lightweight constructions in the automotive industry. However, the production of self-piercing rivets is costly, time-consuming and energy-intensive, as the rivets conventionally must be heat treated and coated in order to ensure an adequate strength, ductility and corrosion resistance. Within this paper, it is shown by the example of a newly established rivet manufacturing process how the sustainability of fastener production can be increased. The general approach in this context is the use of alternative, high strain hardening stainless steels as rivet material, which allows the omission of the post treatment of the rivets after forming. The shortening of the process chain enables a more sustainable rivet production. Thus, not only the energy consumption is reduced, but also costs, which is why the novel manufacturing process is also of interest from an economic point of view.}}, author = {{Uhe, Benedikt and Kuball, Clara-Maria and Merklein, Marion and Meschut, Gerson}}, location = {{Nürnberg}}, publisher = {{Materials Research Proceedings}}, title = {{{Approach for a sustainable process chain in manufacturing of fasteners for mechanical joining}}}, doi = {{10.21741/9781644902417-49}}, year = {{2023}}, } @inproceedings{43090, abstract = {{The application of the mechanical joining process clinching allows the assembly of different sheet metal materials with a wide range of material thickness configurations, which is of interest for lightweight multi-material structures. In order to be able to predict the clinched joint properties as a function of the individual manufacturing steps, current studies focus on numerical modeling of the entire clinching process chain. It is essential to be able to take into account the influence of the joining process-induced damage on the load-bearing capacity of the joint during the loading phase. This study presents a numerical damage accumulation in the clinching process based on an implemented Hosford-Coulomb failure model using a 3D clinching process model applied on the aluminum alloy EN AW-6014 in temper T4. A correspondence of the experimentally determined failure location with the element of the highest numerically determined damage accumulation is shown. Moreover, the experimentally determined failure behavior is predicted to be in agreement in the numerical loading simulation with transferred pre-damage from the process simulation. }}, author = {{Bielak, Christian Roman and Böhnke, Max and Friedlein, Johannes and Bobbert, Mathias and Mergheim, Julia and Steinmann, Paul and Meschut, Gerson}}, booktitle = {{Materials Research Proceedings}}, issn = {{2474-395X}}, publisher = {{Materials Research Forum LLC}}, title = {{{Numerical analysis of failure modeling in clinching process chain simulation}}}, doi = {{10.21741/9781644902417-33}}, year = {{2023}}, } @inbook{52454, author = {{Böhnke, Max and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}}, booktitle = {{Lecture Notes in Mechanical Engineering}}, isbn = {{9783031413407}}, issn = {{2195-4356}}, publisher = {{Springer Nature Switzerland}}, title = {{{Experimental and Numerical Investigation of Clinched Joints Under Shear Tensile Loading at High Strain Rates}}}, doi = {{10.1007/978-3-031-41341-4_12}}, year = {{2023}}, } @inproceedings{29852, author = {{Beule, Felix and Teutenberg, Dominik and Meschut, Gerson and Aubel, Tobias and Matzenmiller, Anton}}, booktitle = {{22. Kolloquium: Gemeinsame Forschung in der Klebtechnik}}, title = {{{Methodenentwicklung zur Versagensanalyse aufgrund der Aushärtung vorgeschädigter Klebverbindungen in stahlintensiven Mischbaustrukturen}}}, year = {{2022}}, } @inproceedings{29855, author = {{Carillo Beber, Vinicius and Nagel, Christof and Mayer, Bernd and Köster, Christian and Matzenmiller, Anton and Hecht, Matthias and Baumgartner, Jörg and Melz, Tobias and Tews, Karina and Çavdar, Serkan and Meschut, Gerson}}, booktitle = {{22. Kolloquium: Gemeinsame Forschung in der Klebtechnik}}, title = {{{Lebensdauerprognose für Stahlklebverbindungen bei multiaxialer Belastung mit Phasenverschiebung, veränderlicher Mittelspannung und variablen Amplituden}}}, year = {{2022}}, } @inproceedings{29344, author = {{Kowatz, Jannik and Teutenberg, Dominik and Meschut, Gerson}}, booktitle = {{22. Kolloquium Gemeinsame Forschung in der Klebtechnik}}, location = {{Online}}, title = {{{Weiterentwicklung der induktiven Schnellhärtung von Klebverbindungen für robuste Fertigungsprozesse unter Berücksichtigung von serienrelevanten Einflussfaktoren}}}, year = {{2022}}, } @inproceedings{30003, author = {{Chudalla, Nick and Meschut, Gerson and Bartley, Aurélie and Wibbeke, Tim Michael}}, booktitle = {{22. Kolloquium: Gemeinsame Forschung in der Klebtechnik}}, title = {{{Analyse des Versagensverhaltens geklebter Stahl-Verbindungen beim werkstoffschonenden Entfügen in der Karosserieinstandsetzung}}}, year = {{2022}}, } @book{30102, author = {{Rossel, Moritz Sebastian and Meschut, Gerson}}, isbn = {{978-3-86776-631-9}}, pages = {{180}}, publisher = {{ Europäische Forschungsgesellschaft für Blechverarbeitung e.V.}}, title = {{{Methodenentwicklung für die Simulation mechanischer Fügeprozesse mit besonderer Berücksichtigung fügespezifischer Reibverhältnisse}}}, volume = {{573}}, year = {{2022}}, } @inproceedings{30222, author = {{Striewe, Marius and Meschut, Gerson and Schmelzle, Lars and Mergheim, Julia and Possart, Gunnar and Steinmann, Paul}}, booktitle = {{22. Kolloquium: Gemeinsame Forschung in der Klebtechnik}}, title = {{{Experimentelle und numerische Untersuchung des Einflusses variabler Betriebstemperaturen auf das Trag- und Versagensverhalten struktureller Klebverbindungen unter Crashbelastung}}}, year = {{2022}}, } @article{27186, abstract = {{The presented paper aims to characterize the damage and fracture behavior of HX340LAD Micro-Alloyed steels using small punch test. Variations with respect to punch geometries and cutting clearance are made to describe the damage behavior of the material under different loading conditions. Experimental investigations are conducted to identify the crack initiation in the specimens. Furthermore, the numerical FEM simulations are performed to identify the stress state at crack initiation. It is shown that different stress states from shear to biaxial tension can be achieved by changing the geometries of punch and varying the cutting clearance. Moreover, it is presented how changing the configurations can influence the stress state variables: Triaxiality and lode angle parameter.}}, author = {{Otroshi, Mortaza and Meschut, Gerson}}, issn = {{1350-6307}}, journal = {{Engineering Failure Analysis}}, keywords = {{Ductile damage, stress state, small punch test, triaxiality, lode angle parameter}}, number = {{c}}, publisher = {{Elsevier}}, title = {{{Influence of cutting clearance and punch geometry on the stress state in small punch test }}}, doi = {{10.1016/j.engfailanal.2022.106183}}, volume = {{136}}, year = {{2022}}, } @inproceedings{30004, author = {{Chudalla, Nick and Teutenberg, Dominik and Meschut, Gerson and Schneider, Miriam and Smart, Dominik}}, booktitle = {{22. Kolloquium: Gemeinsame Forschung in der Klebtechnik}}, title = {{{Systematisierung einer rechnergestützten Auswertemethode zur Versagensanalyse geklebter Verbindungen }}}, year = {{2022}}, } @article{30911, author = {{Vorderbrüggen, Julian and Köhler, Daniel and Grüber, Bernd and Troschitz, Juliane and Gude, Maik and Meschut, Gerson}}, issn = {{0263-8223}}, journal = {{Composite Structures}}, keywords = {{Civil and Structural Engineering, Ceramics and Composites}}, publisher = {{Elsevier BV}}, title = {{{Development of a rivet geometry for solid self-piercing riveting of thermally loaded CFRP-metal joints in automotive construction}}}, doi = {{10.1016/j.compstruct.2022.115583}}, volume = {{291}}, year = {{2022}}, }