轻质铝夹芯板抗冲击性能有限元分析

FEM Analysis of Energy-absorption Property of Metallic Sandwich Plates to Blasting

为了研究夹芯板在爆炸载荷作用下产生较大塑性变形及吸能特性,本文应用非线性有限元分析程序LS-DYNA V970(Livermore Software Technology Corporation)在HP-J6750工作站上完成爆炸冲击载荷作用下相同质量的单铝板、蜂窝夹芯板和波纹夹芯板的动力响应过程模拟。重点研究了夹芯板的吸能特性以及夹芯板各部分的吸能变化规律。在考虑有限变形情况下,相同质量下夹心板比单板具有更强的抗冲击性能和更小的变形。对研究夹芯板抗冲击性能提供了有效的近似方法。

Metallic sandwich plates with aluminum cores have the capability of dissipating considerable energy by large plastic deformation under blast loading. To investigate the impact energy absorption property of two types sandwich plates subjected to blast loading, The finite element models of explosive and two aluminum core plates were established by preprocess software FEMB, and then simulated by using code LS-DYNA3 D. The closed-form solution of dynamic response of sandwich plate at large deflection is obtained. Considering that the blast-time and the core-compression time is more less than the whole dynamic response time. It is found that the sandwich plates with honeycomb and folder cores have the strongest energy absorption capability and smallest deflection than the single aluminum plate in the same mass. Results of the study indicate that the proposed method is a powerful approximation method for the dynamic plasticity analysis of sandwich structures.