碳纤维层合板冲击吸能有限元模拟

为预测复合材料结构的冲击吸能效果，用三维有限元法模拟金属圆柱体冲击碳纤维层合板的过程．层合板被简化为三维正交各向异性材料板；采用Abaqus提供的vumat等扩展编程接口，用FORTRAN编写程序表征材料的弹性、强度和累积失效，实现动态破坏过程仿真；计算结果与冲击试验结果具有可比性．Abaqus的显式分析方法结合编程接口可用于层合板的冲击吸能仿真，结果的准确性取决于用户建立的材料模型．对不同速度、质量和直径的金属圆柱体的冲击进行计算，结果表明在穿透情况下，随着圆柱体速度的增加，圆柱体的动能衰减增多，而系统动能的减少相对稳定，因此后者更适合于临界速度的计算．

Finite element simulation on impact energy absorption of carbon fiber laminated plate

To predict the impact energy absorption effect of composite structure, the impact of metal cylinder on thick carbon fiber laminated plate is simulated by 3D finite element method. The laminated plate is simplified as 3D orthotropic material plate; by the extended programming interfaces of Abaqus such as vumat, a FORTRAN program is developed to characterize the elasticity, strength and cumulative failure so as to implement the simulation on dynamic failure progress; the calculation results and impact test results are comparable. The explicit analysis method of Abaqus combined with program interfaces can be used to simulate impact energy absorption, and its accuracy depends on the material model built by users. The impacts are calculated for metal cylinders with different velocities, masses and diameters, and the results indicate that, under the condition of penetration, the kinetic energy attenuation of the cylinder increases with the increase of cylinder velocity, but the kinetic energy attenuation of the system is relatively stable; the latter is more suitable for the calculation of the critical velocity.