Prediction of residual strength of CFRP after impact

It was found that the residual strength of CFRP after impact decreases as the impact energy increases when the energy is larger than the threshold impact energy. If the impact energy is sufficiently large, the influence of the mass of an impactor on the residual strength of the composite materials can be disregarded. Also, when the specimen is placed on a rigid plane, it was seen that the residual strength decreases as the diameter of the impactor nose increases. The residual strength after impact can be estimated by measuring the size of the permanent impression on the surface of composite materials after impact and applying the prediction equation for the residual strength proposed in this study.