Simplified modeling of self-piercing riveted joints for crash simulation with a modified version of *CONSTRAINED_INTERPOLATION_SPOTWELD

The requirements for energy efficiency and lightweight construction in automotive engineering rise steadily. Therefore a maximum flexibility of the used materials is necessary and new joining techniques are constantly developed. The resulting large number of joints with different properties leads to the need to provide for each type of joint an appropriate modeling method for crash simulation. In this paper an approach for a simplified model of a self-piercing riveted joint for crash simulation will be discussed. The used simplified model is a modified version of the *CONSTRAINED_ INTERPOLATION_SPOTWELD. Firstly the realized modifications as a changed yield and failure behavior will be explained and illustrated. Therefore simulation results of the default and the modified version of the *CONSTRAINED_INTERPOLATION_SPOTWELD will be compared. Secondly the procedure to identify the appropriate model parameters will be presented and shown in an exemplary manner. At once the advantages and limitations of the model will be demonstrated. At least the quality of the model will be validated using simulations of different loaded T-joint experiments, which represents the connection between the rocker panel and the B-pillar. For this purpose three different characteristics will be taken into account: the global responses like the calculated and measured force vs. displacement curve of the punch, the local failure behavior and the order of failure of the rivet joints, and at last the internal forces in the simplified model.