展宽机织复合材料破片高速冲击仿真模拟研究

Simulation of High-speed Impact for Woven Composite Panel

本文基于数值仿真方法研究了展宽平纹机织复合材料平板在金属破片高速冲击载荷作用下的失效行为。在显示动力学求解软件LS-DYNA®中建立了平纹机织复合材料的宏观精细化有限元模型,通过多尺度分析计算得到单层机织复合材料的等效力学性能,采用经典的Chang-Chang失效准则评估复合材料靶板的冲击损伤和失效行为。通过平板高速冲击试验确定了材料在特定冲击条件下的临界穿透速度范围和典型破坏模式,并与数值仿真结果对比,验证了数值模型的准确性。在此基础上,采用所构建的冲击仿真模型研究了平纹机织复合材料在不同冲击速度(0.1~0.8 km/s)载荷下的侵彻失效特性。研究结果表明:展宽机织复合材料平板在承受高速冲击载荷过程中,中间层受压缩损伤区域较小,靠近边界层损伤区域较大;随着冲击速度的增加,机织复合材料平板受压缩损伤区域减小;在冲击速度为0.2~0.8 km/s下,平板吸收能量与破片冲击速度呈近线性关系。

The failure behavior of woven composite panel under high-speed impact through numerical simulation is investigated.Macro-scale detailed finite element model for the woven composite panel is generated by using explicit finite element software,LSDYNA®.Micromechanical theories are used to determine the basic mechanical properties of the woven composite panel.The Chang-Chang failure criterion is adopted to predict the impact damage modes and ultimate failure of the woven composite panel.High-speed impact tests are conducted to assess the critical penetration threshold and examine the typical impact failure features of the woven composite panel,which is also used to validate the developed numerical model by comparing the simulation results with the experimental.The validated numerical model is then used to investigate the penetration process and impact failure mechanism of the composite panel under various impact velocities(0.1~0.8 km/s).The numerical results suggest that:the compression damage area in the middle layer of the woven composite panel is smaller than the surface layers;the compression damage area of the woven composite panel decreases with the increase of impact velocity;and the energy absorbed by the composite panel follows a linear relationship with the impact velocity of the projectile in the velocity range of 0.2~0.8 km/s.