复合材料层板冲击破碎实验与数值评估方法
Impact crushing experiment and numerical evaluation method for composite laminates
-
摘要: 纤维增强复合材料层板是电路板基板的重要组成部分, 预测其破碎过程是废旧电路板破碎机设计的重要依据.首先, 基于实验测得复合材料层板的冲击能量, 对比面内和面外两种冲击破碎方式.然后, 基于Hashin损伤理论建立复合材料层板冲击破碎预测模型, 预测的冲击消耗能量与冲击速度与实验结果吻合度高, 表明Hashin损伤理论可以应用于玻璃纤维复合材料层板冲击破碎问题.通过复合材料层板的面内和面外冲击损伤过程对比分析, 发现面内冲击破碎可以避免层间开裂造成的额外能耗, 所以沿平面方向的冲击破碎效果要好于沿厚度方向的破碎效果.当前冲击损伤预测模型可进一步应用于预测电路板基板的破碎过程, 也可用于指导电路板破碎机传动系统设计.Abstract: Fiber reinforced laminates are commonly used in the manufacture of circuit board substrates, impact crushing process prediction of the fiber reinforced lamitates is an important basis for the design of a crushing machine of used circuit board. Firstly, impact energy corresponding to in plane and out-of-plane impact is obtained by pendulum impact tests. Then, the Hashin damage theory as well as the cohesive zone method is used to simulate the impact crushing process of glass fiber reinforced laminates. The numerical results of impact energy and velocity changes and are in good agreement with the experiments, which indicates that the present model can be applied to the low-speed impact problem of glass fiber composite laminates. According to the impact damage process analysis, it is found that in-plane impact crushing can avoid additional energy consumption caused by interface delamination, so that the in-plane impact crushing effect is better than the out-plane impact crushing effect. The present prediction model can be further applied to predict the crushing process of circuit board substrates and design the transmission system of the impact crushing machine.