PSI - Issue 73

Martin Krejsa et al. / Procedia Structural Integrity 73 (2025) 81–86 Martin Krejsa, Petr Lehner, Jakub Flodr / Structural Integrity Procedia 00 (2025) 000–000

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3.2. Numerical model Fig. 5 shows a force-displacement diagram with a representative record from the physical experiment labeled S6, which showed average values against the whole set. Furthermore, two diagrams obtained from the numerical model are shown: the first one, labelled FEM_S, is without electromechanical machine slip and the second one, labelled FEM_S_corr, takes into account the slip in the jaws. After considering the slip, there is a good agreement between the results of the numerical model and the physical experiment. In the graphical output of the numerical model (see Fig. 6) the equivalent plastic strain can be seen. The locations with the highest degree of plasticity was detected in the left part of the neck. The numerical model does not consider finite element failure, the failure of the clinch joint occurs from the left part towards the right. The left part is broken by a combination of shear and bending and once this part fails, the right part of the joint is broken by tension.

Fig. 5. Comparison of experimental results and numerical models.

Fig. 6. Equivalent plastic strain from the numerical model of the clinch joint.