In this paper

the post buckling load-bearing characteristics and failure mechanism of Nomex honeycomb sandwich structures with different heights were studied by experimental method. Combined with the failure process analysis of honeycomb sandwich structures

it is found that the collapse of Nomex honeycomb cells is caused by local buckling

accompanied by the instability phenomenon of the whole buckling. The collapse process is a non-linear movement process. The residual strength of honeycomb cells after collapse reflects the post buckling capacity of the honeycomb structure. The residual strength of Nomex honeycomb is about 45%–46% of the ultimate strength. It is found that the energy absorption rate of sandwich structure with honeycomb height of 6mm is higher than that of sandwich structure with honeycomb height of 8mm. This study can provide a good basis for the optimal design of honeycomb sandwich structure.