局部冲击载荷作用下星形蜂窝夹芯梁的动态响应研究

Considering the energy absorption efficiency of star honeycomb structure and the advantages of sandwich structure in specific stiffness and specific strength, a sandwich beam structure of aluminum plate-star core layer-aluminum plate was designed and prepared. Using foam aluminum bullet to impact the sandwich beam at high speed to simulate local impact load, the influence law of cell wall thickness of core layer on dynamic impact performance of sandwich beam structure was emphatically analyzed. The deformation process of foam aluminum bullets impacting the sandwich beam was recorded by high-speed photography, and the deformation process of the rear panel was recorded by DIC. According to the experimental results, the deformation and failure modes of sandwich beams are classified and analyzed. The experimental results show that there are different failure modes for the sandwich beam panel, back panel and core layer. The cell wall thickness has a significant effect on the deformation of the sandwich beam structure, and the deflection of the back plate of the sandwich beam is linearly related to the initial velocity of the foam aluminum bullet.