1.Key Laboratory of High Performance Ship Technology Ministry of Education, (Wuhan University of Technology), Wuhan 430063, China;
2.China Special Vehicle Research Institute, Jingmen 448035，China；
3.State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
Abstract：Honeycomb metal and sandwich structure is a new type of lightweight high-strength structural and functional composite structures, which is widely applied in structural lightweight design and impact protection.In this paper, a dynamic impact numerical model of honeycomb sandwich panel (HSP) was established by using the ABAQUS/Explicit software.The numerical calculated results are in good agreement with experimental results.On this basis, the dynamic responses of HSPs under repeated impact loads were investigated.The time histories of impact force and plastic deformation, the impact force-displacement curves as well as the permanent deflections were obtained.The influences of impact energy and the wall thickness of honeycomb cells as well as the thickness distribution of face sheet on the dynamic responses and energy absorption performances of HSPs were further performed.Numerical results show that, with the increase of impact numbers, the bending deflections of both top and bottom face sheets accumulate gradually.The compressive deformations of the honeycomb cores increase gradually and finally the densification phenomenon appears, resulting in the enhancement of flexural stiffness and the reduction of bending deformation increment as well as the decrease of the impact energy absorption.In addition, the plastic deformation accumulation and energy absorption performances of HSPs under repeated impact loads can be effectively modulated by the wall thickness of honeycomb cells and the thickness distribution of face sheet.
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