基于凹坑深度的复合材料低速冲击损伤分析

对复合材料层合板进行了低速冲击实验,建立了冲击凹坑深度与冲击能量的关系。依据凹坑深度反推冲击能量,并用能量确定冲锤质量和冲击速度,从而可对层合板进行动态数值模拟。冲击凹坑深度与冲击能量的关系表明,凹坑深度的变化是与冲击能量的变化过程相适应的,在此基础上对损伤的分布形式及大小做了详细的分析。采用ANSYS有限元程序对复合材料层合板横向低速冲击进行模拟,采用瞬态分析方法来研究层合板的冲击与损伤过程。对冲击后的试验件进行了C扫描损失检测。计算和试验结果表明,此方法是可行的,特别适合于层合板冲击后的损伤评估。

Damage Analysis for Composite Materials Subjected to Low-Speed Impact Based on Pit-Depth Analysis

Low-speed impact experiment for composite laminated plate was carried out, and the relationship between dent depth and impact energy was established. The damage energy was calculated reversely from the dent depth, and the hammer's mass and impact speed were determined by impact energy, therefore, the dynamical numerical simulation for laminates could be carried out. Relation between the dent depth and the impact energy indicates that the variation of pit depth is consistent with the energy, and detailed analysis of damage distribution and size was conducted. The process of transverse low-speed impact of composite laminated plate was simulated by using finite element soft package ANSYS and method of transient analysis. C-scan was used to measure and to record the internal and external damages of laminated plate. Calculated and experimental results show that this method is feasible, especially is fit for the damage evaluation of composite laminated materials subjected to impact.