@article{50726,
  abstract     = {{<jats:p>Resistance spot‐welded joints containing press‐hardened steels are seen to exhibit a fracture mode called total dome failure, where the weld nugget completely separates from one steel sheet along the weld nugget edge. The effect of weld nugget shape and material property gradients is studied based on damage mechanics modeling and experimental validation to shed light on the underlying influencing factors. For a three‐steel‐sheet spot‐welded joint combining DP600 (1.5 mm)–CR1900T (1.0 mm)–CR1900T (1.0 mm), experiments under shear loading reveal that fracture occurs in the DP600 sheet along the weld nugget edge. In subsequent numerical simulation studies with damage mechanics models whose parameters are independently calibrated for every involved material configuration, three variations of the geometrical joint configuration are considered—an approximation of the real joint, one variation with a steeper weld nugget shape, and one variation with a less pronounced gradient between weld nugget material and heat‐affected zone material properties. The results of the finite‐element simulations show that a shallower weld nugget and a more pronounced material gradient lead to a faster increase of plastic strain at the edge of the weld nugget and promote the occurrence of total dome failure.</jats:p>}},
  author       = {{Schuster, Lilia and Olfert, Viktoria and Sherepenko, Oleksii and Fehrenbach, Clemens and Song, Shiyuan and Hein, David and Meschut, Gerson and Biro, Elliot and Münstermann, Sebastian}},
  issn         = {{1611-3683}},
  journal      = {{steel research international}},
  keywords     = {{Materials Chemistry, Metals and Alloys, Physical and Theoretical Chemistry, Condensed Matter Physics}},
  publisher    = {{Wiley}},
  title        = {{{Influences of Weld Nugget Shape and Material Gradient on the Shear Strength of Resistance Spot‐Welded Joints}}},
  doi          = {{10.1002/srin.202300530}},
  year         = {{2024}},
}

@inproceedings{54142,
  author       = {{Beule, Felix and Al Trjman, Mohamad and Teutenberg, Dominik and Meschut, Gerson}},
  location     = {{Shanghai}},
  title        = {{{Method development (modelling, simulation, characterisation) in adhesive bonding technology}}},
  year         = {{2024}},
}

@inproceedings{54240,
  author       = {{Gilich, Julian and Meschut, Gerson and Gröger, Benjamin and Wiebicke, Felix and Koch, Ilja and Gude, Maik}},
  booktitle    = {{14. Doktorandenseminar Klebtechnik}},
  location     = {{Kassel}},
  title        = {{{Experimentelle und numerische Analyse des Fließverhaltens von hochviskosen Wärmeleitstoffen im Fertigungsprozess}}},
  year         = {{2024}},
}

@inproceedings{56087,
  author       = {{Beule, Felix and Teutenberg, Dominik and Meschut, Gerson}},
  booktitle    = {{The 16th International Conference on the Science and Technology of Adhesion and Adhesives}},
  location     = {{Oxford, UK}},
  title        = {{{Numerical modelling of the influence of viscous fingering on the mechanical properties of structural adhesive joints}}},
  year         = {{2024}},
}

@article{54847,
  abstract     = {{The widespread adoption of ultra-high strength steels, due to their high bulk resistivity, intensifies expulsion issues in resistance spot welding (RSW), deteriorating both the spot weld and surface quality. This study presents a novel approach to prevent expulsion by employing a preheating current. Through characteristic analysis of joint formation under critical welding current, the importance of plastic material encapsulation around the weld nugget (plastic shell) at high temperatures in preventing expulsion is highlighted. To evaluate the effect of preheating on the plastic shell and understand its mechanism in expulsion prevention, a two-dimensional welding simulation model for dissimilar ultra-high strength steel joints was established. The results showed that optimal preheating enhances the thickness of the plastic shell, improving its ability to encapsulate the weld nugget during the primary welding phase, thereby diminishing expulsion risks. Experimental validation confirmed that by employing the optimal preheating current, the maximum nugget diameter was enhanced to 9.42 mm, marking an increase of 13.4 % and extending the weldable current range by 27.5 %. Under quasi-static cross-tensile loading, joints with preheating demonstrated a 7.9 % enhancement in maximum load-bearing capacity compared to joints without preheating, showing a reproducible and complete pull-out failure mode within the heat-affected zone. This study offers a prevention method based on underlying mechanisms, providing a new perspective for future research on welding parameter optimization with the aim of expulsion prevention.}},
  author       = {{Yang, Keke and El-Sari, Bassel and Olfert, Viktoria and Wang, Zhuoqun and Biegler, Max and Rethmeier, Michael and Meschut, Gerson}},
  issn         = {{1526-6125}},
  journal      = {{Journal of Manufacturing Processes}},
  keywords     = {{Expulsion Resistance spot welding Finite element modelling Preheating Weldable current range Ultra-high strength steel}},
  pages        = {{489--502}},
  publisher    = {{Elsevier BV}},
  title        = {{{Expulsion prevention in resistance spot welding of dissimilar joints with ultra-high strength steel: An analysis of the mechanism and effect of preheating current}}},
  doi          = {{10.1016/j.jmapro.2024.06.034}},
  volume       = {{124}},
  year         = {{2024}},
}

@inproceedings{56682,
  author       = {{Einwag, Jonathan-Markus and Goetz, Stefan and Wartzack, Sandro}},
  booktitle    = {{DS 133: Proceedings of the 35th Symposium Design for X (DFX2024)}},
  publisher    = {{The Design Society}},
  title        = {{{Approach for the Reliable and Virtual Design of Mechanical Joints in an Uncertain Environment}}},
  doi          = {{10.35199/dfx2024.23}},
  year         = {{2024}},
}

@article{58348,
  abstract     = {{<jats:p> Clinching is a mechanical joining technology, in which a mainly form-fit joint is created by means of local cold forming. To characterize the load-bearing behavior of such joints, they are typically analyzed destructively, for example by tensile-shear tests in combination with metallographic sections. However, both the initiation and progress of failure can only be described to a limited extent by this method. Furthermore, these tests allow only limited conclusions about clinch points under in-service loading. More purposefully, clinch points can be analyzed nondestructively by combining in-situ computed tomography (CT) and transient dynamic analysis (TDA). The TDA continuously measures the dynamic behavior of the specimen and indicates failure events like crack initiation, which then can be evaluated thoroughly by stopping the test and performing a CT scan. To qualify the TDA for this task, it is necessary to link the observed damage behavior with specific dynamic characteristics. In this work, the complementation of in-situ CT and TDA is investigated by testing a clinched single-lap tensile-shear specimen made of aluminum. The testing procedure is stepwise: at certain displacement levels, the specimen is investigated by in-situ CT and TDA. While the in-situ CT provides the location, extent, and development of the failure phenomena, the TDA uses this information to evaluate the dynamic signal and detect relevant frequency ranges, which indicate damage events. The results demonstrate, that failure initiation and progression can be analyzed efficiently by combining both measuring systems. The TDA reliably detects relevant signal changes in the monitored frequency band. By means of in-situ computed tomography, the corresponding failure phenomena can be described in detail, enhancing the understanding of the load-bearing and deformation behavior of clinch points. The concatenation of characteristic signal changes and observed failure phenomena can henceforth be transferred to analyze complex structures during operation nondestructively by TDA. </jats:p>}},
  author       = {{Reschke, Gregor and Köhler, Daniel and Kupfer, Robert and Troschitz, Juliane and Gude, Maik and Brosius, Alexander}},
  issn         = {{0954-4089}},
  journal      = {{Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering}},
  keywords     = {{Clinching, Non-destructive testing, Transient Dynamic Analysis}},
  publisher    = {{SAGE Publications}},
  title        = {{{In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points}}},
  doi          = {{10.1177/09544089241251646}},
  year         = {{2024}},
}

@article{57742,
  author       = {{Böhnke, Max and Bielak, Christian Roman and Beck, Robert and Bobbert, Mathias and Meschut, Gerson}},
  issn         = {{2223-7690}},
  journal      = {{Friction}},
  publisher    = {{Tsinghua University Press}},
  title        = {{{Development of a friction model for the numerical simulation of clinching processes}}},
  doi          = {{10.26599/frict.2025.9441052}},
  year         = {{2024}},
}

@inproceedings{58382,
  author       = {{Striewe, Marius and Bähr, Philipp and Meschut, Gerson and Hein, David and Sommer, Silke}},
  booktitle    = {{14. 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         = {{2024}},
}

@book{58403,
  author       = {{Mayer, Bernd and Nagel, Christof and Fernandes, Pedro Henrique Evangelista and Matzenmiller, Anton and Köster, Christian and Melz, Tobias and Baumgartner, Jörg and Hecht, Matthias and Tews, Karina and Çavdar, Serkan and Meschut, Gerson}},
  publisher    = {{Forschungsvereinigung Stahlanwendung e.V.}},
  title        = {{{Lebensdauerprognose für Stahlklebverbindungen bei multiaxialer Belastung mit Phasenverschiebung, veränderlicher Mittelspannung und variablen Amplituden}}},
  volume       = {{1427}},
  year         = {{2024}},
}

@inproceedings{52216,
  author       = {{Tews, Karina and Teutenberg, Dominik and Meschut, Gerson}},
  booktitle    = {{DECHEMA Workshop für Klebstoffanwender: Simulation von Klebverbindungen}},
  location     = {{Köln}},
  title        = {{{Mechanisches Verhalten: Charakterisierung von Klebstoffen}}},
  year         = {{2024}},
}

@unpublished{58441,
  abstract     = {{This study presents a numerical approach using a 3D finite element model to quantify the remaining clamp load of a plastic nut joint after a specific time. The viscoelastic relaxation of a thermoplastic nut, which is predominantly screwed on a welding stud, is described by a material card using Prony Series. Prony Series are derived from experimental Dynamical Mechanical Analysis with different moisture and fiber contents of the thermoplastic. Since plastic nuts usually do not have preformed threads, the increased temperatures and resulting stresses from the thread-forming process are considered in the simulation. Firstly, the FE model is verified by substrate stress relaxation tests. Subsequently, experimental clamp load measurements with miniature compression load cells verify the clamp load prediction. Finally, the developed model is used to analyze the clamp load distribution within the threads}},
  author       = {{Wippermann, Jan and Meschut, Gerson}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Numerical modeling of clamp load relaxation of plastic nuts under varying moisture and fiber content}}},
  year         = {{2024}},
}

@inbook{58440,
  author       = {{Wippermann, Jan and Meschut, Gerson}},
  booktitle    = {{Proceedings of the Munich Symposium on Lightweight Design 2023}},
  isbn         = {{9783031646683}},
  publisher    = {{Springer Nature Switzerland}},
  title        = {{{Effect of Water Absorption on the Clamp Load of Plastic Nuts}}},
  doi          = {{10.1007/978-3-031-64669-0_5}},
  year         = {{2024}},
}

@article{58442,
  author       = {{Wippermann, Jan and Meschut, Gerson}},
  journal      = {{JOINING PLASTICS}},
  title        = {{{Analyse des Ein- und Überdrehmoments von Kunststoffmuttern in Abhängigkeit von der Luftfeuchtigkeit}}},
  volume       = {{18}},
  year         = {{2024}},
}

@inproceedings{58446,
  author       = {{Wippermann, Jan and Meschut, Gerson}},
  booktitle    = {{14 Gemeinsames Kolloquium Zur Mechanischen Fügetechnik}},
  title        = {{{Entwicklung einer Methode zur Prognose der Verschraubungsparameter von Kunststoffmuttern}}},
  year         = {{2024}},
}

@inproceedings{58458,
  author       = {{Gilich, Julian and Teutenberg, Dominik and Meschut, Gerson and Gröger, Benjamin and Wiebicke, Felix and Koch, Ilja and Gude, Maik}},
  booktitle    = {{77th IIW Annual Assembly and International Conference on Welding and Joining}},
  location     = {{Rhodos, Griechenland}},
  title        = {{{Influences on the Material Displacement and Compression Stresses in the Joining Process of Highly Viscous Thermal Interface Materials}}},
  year         = {{2024}},
}

@article{59585,
  abstract     = {{<jats:p>Similar to bulk metal forming, clinch joining is characterised by large plastic deformations and a variety of different 3D stress states, including severe compression. However, inherent to plastic forming is the nucleation and growth of defects, whose detrimental effects on the material behaviour can be described by continuum damage models and eventually lead to material failure. As the damage evolution strongly depends on the stress state, a stress-state-dependent model is utilised to correctly track the accumulation. To formulate and parameterise this model, besides classical experiments, so-called modified punch tests are also integrated herein to enhance the calibration of the failure model by capturing a larger range of stress states and metal-forming-specific loading conditions. Moreover, when highly ductile materials are considered, such as the dual-phase steel HCT590X and the aluminium alloy EN AW-6014 T4 investigated here, strong necking and localisation might occur prior to fracture. This can alter the stress state and affect the actual strain at failure. This influence is captured by coupling plasticity and damage to incorporate the damage-induced softening effect. Its relative importance is shown by conducting inverse parameter identifications to determine damage and failure parameters for both mentioned ductile metals based on up to 12 different experiments.</jats:p>}},
  author       = {{Friedlein, Johannes and Böhnke, Max and Schlichter, Malte Christian and Bobbert, Mathias and Meschut, Gerson and Mergheim, Julia and Steinmann, Paul}},
  issn         = {{2504-4494}},
  journal      = {{Journal of Manufacturing and Materials Processing}},
  number       = {{4}},
  publisher    = {{MDPI AG}},
  title        = {{{Material Parameter Identification for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch Joining}}},
  doi          = {{10.3390/jmmp8040157}},
  volume       = {{8}},
  year         = {{2024}},
}

@article{60106,
  abstract     = {{<jats:p> Clinching is a mechanical joining technology, in which a mainly form-fit joint is created by means of local cold forming. To characterize the load-bearing behavior of such joints, they are typically analyzed destructively, for example by tensile-shear tests in combination with metallographic sections. However, both the initiation and progress of failure can only be described to a limited extent by this method. Furthermore, these tests allow only limited conclusions about clinch points under in-service loading. More purposefully, clinch points can be analyzed nondestructively by combining in-situ computed tomography (CT) and transient dynamic analysis (TDA). The TDA continuously measures the dynamic behavior of the specimen and indicates failure events like crack initiation, which then can be evaluated thoroughly by stopping the test and performing a CT scan. To qualify the TDA for this task, it is necessary to link the observed damage behavior with specific dynamic characteristics. In this work, the complementation of in-situ CT and TDA is investigated by testing a clinched single-lap tensile-shear specimen made of aluminum. The testing procedure is stepwise: at certain displacement levels, the specimen is investigated by in-situ CT and TDA. While the in-situ CT provides the location, extent, and development of the failure phenomena, the TDA uses this information to evaluate the dynamic signal and detect relevant frequency ranges, which indicate damage events. The results demonstrate, that failure initiation and progression can be analyzed efficiently by combining both measuring systems. The TDA reliably detects relevant signal changes in the monitored frequency band. By means of in-situ computed tomography, the corresponding failure phenomena can be described in detail, enhancing the understanding of the load-bearing and deformation behavior of clinch points. The concatenation of characteristic signal changes and observed failure phenomena can henceforth be transferred to analyze complex structures during operation nondestructively by TDA. </jats:p>}},
  author       = {{Reschke, G and Köhler, D and Kupfer, R and Troschitz, J and Gude, M and Brosius, A}},
  issn         = {{0954-4089}},
  journal      = {{Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering}},
  publisher    = {{SAGE Publications}},
  title        = {{{In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points}}},
  doi          = {{10.1177/09544089241251646}},
  year         = {{2024}},
}

@article{60105,
  abstract     = {{<jats:p> Lightweight design by using low-density and load-adapted materials can reduce the weight of vehicles and the emissions generated during operation. However, the usage of different materials requires innovative joining technologies with increased versatility. In this investigation, the focus is on describing and characterising the failure behaviour of connections manufactured by an innovative thermomechanical joining process with adaptable auxiliary joining elements in single-lap tensile-shear tests. In order to analyse the failure development in detail, the specimens are investigated using in-situ computed tomography (in-situ CT). Here, the tensile-shear test is interrupted at points of interest and CT scans are conducted under load. In addition, the interrupted in-situ testing procedure is validated by comparing the loading behaviour with conventional continuous tensile-shear tests. The results of the in-situ investigations of joints with varying material combinations clearly describe the cause of failure, allowing conclusions towards an improved joint design. </jats:p>}},
  author       = {{Borgert, T and Köhler, D and Wiens, E. and Kupfer, R and Troschitz, J and Homberg, W and Gude, M}},
  issn         = {{1464-4207}},
  journal      = {{Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications}},
  number       = {{12}},
  pages        = {{2299--2306}},
  publisher    = {{SAGE Publications}},
  title        = {{{In-situ computed tomography analysis of the failure mechanisms of thermomechanically manufactured joints with auxiliary joining element}}},
  doi          = {{10.1177/14644207241232233}},
  volume       = {{238}},
  year         = {{2024}},
}

@inproceedings{60107,
  abstract     = {{<jats:p>Abstract. In lightweight constructions, clinching represents a cost-effective solution, in which joints are produced by local cold forming of the joining parts. Clinching phenomena are typically evaluated using destructive testing methods. While these methods influence the clinch point’s state, in-situ computed tomography (in-situ CT) is able to explore the clinching process with a specimen under load. Here, the path-controlled clinching process is interrupted at certain displacement levels and the specimen is scanned by CT while remaining in a stationary state. These interruptions are always accompanied by settling effects reducing the reaction force. Therefore, in this work, the influence of these interruptions on the force-displacement behavior during clinching and on the final clinch point’s geometric properties is investigated. </jats:p>}},
  author       = {{Köhler, D. and Kupfer, R. and Troschitz, J. and Gude, M.}},
  booktitle    = {{Materials Research Proceedings}},
  issn         = {{2474-395X}},
  publisher    = {{Materials Research Forum LLC}},
  title        = {{{In-situ CT of the clinching process – Influence of settling effects due to process interruptions}}},
  doi          = {{10.21741/9781644903131-187}},
  volume       = {{41}},
  year         = {{2024}},
}