爆炸荷载作用下方形夹芯板动力学响应与优化设计数值分析

Numerical analysis of dynamic response and optimization design of square sandwich panel under explosion load

为研究方形蜂窝铝板在爆炸荷载作用下的动力学响应,基于LS-DYNA非线性有限元软件,建立了TNT炸药-前后面板-蜂窝夹芯-空气的三维有限元模型。采用ALE(任意的拉格朗日欧拉)多物质流固耦合算法分析了蜂窝铝板在冲击荷载作用下的变形机理、塑性变形、能量吸收以及结构的优化。数值模拟结果表明:随着面板厚度、核心高度的增加,蜂窝铝板在冲击荷载作用下的塑性变形明显减小,抵抗变形的能力增强;随着爆轰入射角度的增加,结构的破坏程度有所减小,入射角越大这种效果越发明显。对结构给定边长和受冲击面积以及面板厚度配合比、夹芯量纲为一的高度进行了局部的优化分析,为设计优质铝蜂窝板提供参考。

In order to study the dynamic response of square honeycomb aluminum plates under blast load,a three-dimensional finite element model of TNT explosives-front and rear panels-honeycomb sandwich-air is established based on LS-DYNA nonlinear finite element software.ALE(Arbitrary Lagrangian-Eulerian)multi-material fluid-solid coupling algorithm is used to analyze the deformation mechanism plastic deformation,energy absorption structural optimization of honeycomb aluminum plate under impact load.The numerical simulation results show that with the increase of panel thickness and core height,the plastic deformation of honeycomb aluminum sheet under impact load is obviously reduced and the capability to resist deformation is enhanced.With the increase of incident angle,the various anti-explosion performance indexes of the structure become smaller and the larger the incident angle,the more obvious the effect.The side length and affected area,the panel thickness ratio and the dimensionless height of the sandwich structure are optimized locally which provides a reference for designing high quality aluminum honeycomb panels.