Residual compression strength of stitched composite panels with impact damage

The damage modes and failure mechanism were released through compressive experiment on stitched composites with impact damage. The stress field of stitched composite plate with impact damage, which was modeled by a hole, was calculated by hybrid stress elements. The residual compressive strength was predicted by the point stress criterion based on characteristic curve. The results indicate that the impact damage is approximate to an round shape, and the compressive damage type is different in stitched and unstitched laminate. The compression strength can be simulate by equivalent hole method, and the character distance and damage area are main influence factors of calculated results.