冰雹撞击下泡沫铝夹芯板的动态响应

摘要

在传统单层泡沫夹芯结构的上、下面板之间插入中面板,通过移动中面板的位置,获得了外形尺寸相同、质量相等的5种构型夹芯结构,其上层芯材与芯材总厚度比分别为0∶30、10∶30、15∶ 30、20∶30和30∶30.在量纲分析的基础上,应用非线性动力有限元程序LS-DYNA对5种构型夹芯结构进行了冰雹撞击数值分析,研究了中面板位置对夹芯板的能量吸收、能量耗散和动态响应的影响.结果表明:中面板的存在对下层芯材能形成有效的保护;随着中面板位置由上向下移动,夹芯板的抗撞击性能呈现由大到小再增大的态势.数值计算结果对抗冰雹撞击夹芯结构的优化设计具有一定的参考价值.%In this work,by inserting an additional sheet,called the middle sheet,between the upper and lower sheets of a traditional single-layer foam core sandwich panel consisting of a core with bonded with two sheets on either side,we fabricated sandwich panels with five structures that have the same dimensions and weights by changing the position of the middle sheet.The ratios of the upper core thickness to the total core thickness are 0 ∶ 30,10 ∶ 30,15 ∶ 30,20 ∶ 30 and 30 ∶ 30,respectively.On the basis of dimensional analysis,we conducted numerical analysis of the sandwich panels subjected to hailstone impact using the nonlinear finite element program LS-DYNA,and investigated the influence of the middle sheet's position on the energy absorption,energy dissipation and dynamic response of the sandwich panel.The numerical results show that the middle sheet provides an effective protection for the lower core,and the anti-impact performance of the sandwich panel exhibited a tendency to change from strong to weak and then from weak to strong as the middle sheet moved along the direction of the hailstone impact.The results of the numerical simulation offer a reference for the optimization design of the sandwich structures under hailstone impact.