CFRP/Al胶接接头形貌特征对连接性能影响

The multi-material structures is one of the effective technical approaches to realize vehicle weight reduction, and the technical difficulty is the connection between heterogeneous materials. For the CFRP/Al single-lap joints, based on the cohesive force model, one finite element analysis model was established, and the effectiveness of the finite element model was verified through experiments. Three CFRP/Al adhesive joints with different morphological features were constructed, and the ultimate failure load and failure energy absorption under uniaxial tensile load were used as performance indicators. The results show that compared with the ordinary single lap joints, the arc joint damage load and energy absorption are reduced by 11.3% and 9.88%, respectively. Although the failure load of rectangular slot joints has been reduced, but due to the more effective use of the middle region of the adhesive layer, the joint energy absorption characteristics have been greatly improved, and the joint impact resistance performance has increased by 91.63%.