Prediction of the compressive strength for composite honeycomb core sandwich panels after low speed impact

Based on the experimental study of the compressive damage mechanism on the sandwich panel with composite honeycomb core after low speed impact, the equivalent delamination model was used to simulate the impact damage. It was assumed that the boundary of sublaminate formed by the equivalent delamination is clamped and the load, on which the sublaminate buckled, was considered as compressive failure load. Comparing the result of analysis with experiment, it has been shown that the method of equivalent damage could be used to estimate the residual strength of the sandwich panel, in the case of the face sheet has no obvious crack after impact.