非平衡刚度胶-铆混合连接接头特性及失效机制

To solve the problem of multi-material connection in lightweight automotive bodies, the mechanical properties and failure mechanism of carbon fiber reinforced polymer (CFRP) and aluminum alloy unbalanced four-rivets bonded-riveted hybrid joints were studied. Based on re-import and predefined field, a nonlinear finite element analysis model of CFRP/Al unbalanced hybrid joint was established. The process of riveting, springback and progressive failure mechanism under tensile load of the hybrid joint were simulated. And comparative analysis of mechanical properties and failure modes between bonded joint, riveted joint and hybrid joint was carried out. It is shown that the modeling method proposed can take into consideration the impact of the riveting process and the process sequence on the characteristics of the hybrid joint simultaneously. The error value of the peak load and energy absorption predicted by the model is of 2.3% and 5.2% respectively with high prediction accuracy. The riveting can provide a strengthening effect on the bonding at the early stage of failure. The failure takes place usually in the form, the adhesive layer fails firstly and after that the aluminum plate fails. The simulation and test results are consistent relatively, verifying the correctness of the modeling method proposed.