Bähr, PhilippPhilippBährSommer, SilkeSilkeSommerUnruh, EduardEduardUnruhHein, DavidDavidHeinMeschut, GersonGersonMeschut2024-06-242024-06-242022https://publica.fraunhofer.de/handle/publica/470357The construction of car bodies in multi-material design ensures an optimal utilization of local material properties. Therefore, it plays an important role in the realization of modern lightweight concepts. The use of multi-material design leads to the fact that different types of materials have to be joined together and thus challenges joining techniques such as spot-welding. Accordingly, alternative joining techniques such as self-piercing riveting (SPR) are used to join these different types of materials. Every joint within a structure represents a notch, which can be critical for the structural integrity in dependence of the loading situation. These notches are caused by multiple reasons namely the punched hole in the upper sheet and the thinning of the lower sheet as well as micro-cracks at the edge of the punched hole. They result in stress concentrations in the sheet metal surrounding the joint and can thereby be critical for the structural integrity of a component. The consideration of these notches in the component design is highly important. In this paper a method is described for the consideration of the influence of geometrical notches on the component behavior. The developed method can be used in finite element simulations with coarse meshes, ensuring the applicability in large scale crash simulations of vehicles. It is calibrated based on experimental results of specimen tests and validated based on more complex component tests. The developed method can predict crack initiation due to notch effects and shows a good correlation with experimental results.enmechanical and thermo-mechanical jointsnotch effectspress-hardened steel simulationsimplified modellingmaterial failureDDC::600 Technik, Medizin, angewandte Wissenschaften::620 Ingenieurwissenschaften::620 Ingenieurwissenschaften und zugeordnete Tätigkeitenconference paper