民机雷达罩的抗鸟撞非线性力学行为仿真研究OA北大核心CSTPCD

In order to study the bird strike resistance of a civil aircraft radome structure,a radome model using fiber-reinforced nonlinear dynamic constitutive is established based on ABAQUS.The constitutive model comprehensively considers the nonlinear behavior and strain rate effect of composite materials and foam materials.In this paper,we consider the nonlinear and strain rate effects of the panel materials(including composites and foam),the layer sequences and angles of the sandwich structure,and the thickness ratio of the front and rear panels.The results show that the nonlinear dynamic constitutive of fiber-reinforced composites can well describe the strain rate strengthening effect of the radome composite structure under shock loading.The damage mechanisms of radome panels of different layer angles are similar,and the primary failure mechanism is matrix tensile damage.The model with the panel layer sequence of[0/-45/45]/[45/-45/0]and a near-one front and rear panel thickness ratio has higher energy absorption capacity.