Abstract:
Objective: Stainless steel honeycomb (abbreviated as SSH) has a large rated energy absorption capacity and can be used as energyabsorbing material for vehicle end, and is applied in the energyabsorbing zone of vehicle anticlimbers. Therefore, it is necessary to study the influence of strain rate effects on the dynamic impact performance of SSH. Method: Using 304 stainless steel as the base material, a numerical model of SSH under heterogeneous compression is established. Two different specifications of SSH are simulated and modeled. The model validity is verified through quasistatic compression tests of SSH. Based on the finite element model of SSH, the influence of strain rate effect on the crush stress, energy absorption, and deformation mode of SSH structure is analyzed. Result & Conclusion: The 304 stainless steel material exhibits obvious strain rate strengthening effect. The crush stressdisplacement curve considering strain rate effect is smoother and more similar to the curves obtained from experimental tests in the literature. With the consideration of strain rate effect, the peak crush stress and average crush stress of SSH increase significantly, while the maximum compression displacement and ideal energy absorption efficiency decrease. The strain rate effect of 304 stainless steel material leads to an increase in the required strain for the formation of plastic hinges in the honeycomb structure, thus affecting its deformation mode.