强冲击载荷下多孔钛动态力学性能实验及数值模拟

Dynamic Experiment and Numerical Simulation Research on Cellular Titanium Under Impact Loading

对多孔钛在强冲击载荷下的动态力学性能进行了实验和数值模拟研究.通过一级轻气炮分别对孔隙率为30%的试样以及孔隙率为20%的试样进行冲击加载,得到了多孔钛在强冲击载荷下的冲击压力与时间的关系以及其他相关数据.实验测试结果表明,冲击压力会因试件中孔洞的影响而发生衰减;多孔钛的压力峰值没有产生应力平台,显示出了强烈的衰减特性以及应变率相关的黏弹性特性.本文同时依据实验,利用有限元程序对多孔钛的平板撞击实验进行了数值模拟,所得到的压力时间曲线以及其他重要参数与实验值吻合较好.

Shock compression experiments and simulations were taken to study the dynamic performance of cellular titanium.By using one-stage light-gas gun,titanium samples with porosity of 30% and 20% were studied.The relationship between shock pressure and shock time and some experimental data were obtained.The experiment results show that in the process of shock wave propagating,the peak pressure is decreasing due to the influence of voids in samples.When shock wave propagates through the porous titanium sample,no obvious peak pressure platform appears,but some characteristics correlated with strain appear,including intense attenuation,viscidity and elasticity.Also,a finite element analysis software was used to simulate the plate impact experiments.The simulating results,pressure-time curve and some important parameters,are match well with the experiment results.