子弹正冲击下多层板靶的损伤与应变波传播

基于连续损伤力学，对于子弹冲击多层板靶的变形─损伤过程以三维数值模拟作了理论研讨，给出了必要的基本方程．板靶具有材料各向异性和结构非均匀性；冲击引起的微损伤是各向异性的，造成材料的非线性；冲击造成的局部大变形，构成几何非线性．给出了计算实例；计算结果说明了典型的应变波在靶中的传播．

Damage and the Strain-Wave Transmission for Multilayer Target impacted Straight by a Bullet

Based on continuum damage mechanics, the deformation-damage process of a multilayer target impacted straight by a bullet is simulated with 3-dimensional numerical analysis and the basic equations are derived. The composite material of the target is anisotropic and the structure of the target is heterogeneous. The micro-damage induced by the impact is also anisotropic and results in nonlinearity of the material. The local large deformation of the target due to impact. however, causes geometric nonlinearity. The micro-damage, including the cracking of matrix and fiber within the lamina and the interlayer fracture, is dealt with by nodal division in the finite element analysis. The steel bullet is assumed to be linearly elastic and its damage is neglected. A calculating example is given and the typical strain-Wave transmission in the target is explained.