P 958 - Experimental and numerical investigations of the crash behaviour of hybrid joints

As part of the research project, the crash behaviour of semi-tubular self-pierce riveted joints made of steel-steel material combinations was comprehensively characterised. For this purpose, characteristic data from the basic tests on standardised samples were determined for the bonded joint. In addition, a test concept was developed as part of the research project for the determination of characteristic values on mechanically joined point-type joints on the basis of basic tests. The load and speed-dependent load-bearing capacity determination for characterising the joint and failure behaviour of mechanically joined, bonded and hybrid joined joints at the technological test level was carried out using the LWF-KS-2 test concept as well as shear tensile and peel tensile specimens. This resulted in a corresponding database for estimating the load-bearing behaviour of these joints. Based on the characteristic values determined from the basic tests, suitable numerical models were developed and optimised for practical application. The verification of the developed substitute models on the basis of the determined joint parameters on technological samples showed good agreement in comparison to the experimental results, both for the elementary joining methods of adhesive bonding and semi-tubular self-pierce riveting, as well as for the hybrid combination of these joining methods. The replacement model was validated by simulating the T-joint tests for the investigated joining processes while varying the load application and test speed. Good agreement was achieved with the test results. It was shown that the substitute model developed as part of this project is suitable for modelling semi-tubular riveted joints in vehicle crash simulations.