Impact crushing experiment and numerical evaluation method for composite laminates

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.