Residual compressive strength of CFRP laminate damaged by impact under axial static loading.

Abstract

An experimental investigation was conducted to obtain the residual compressive strength of laminate specimens of carbon fiber reinforced epoxy (CFRP), which were damaged by penetrative impact from the side under the axial static load, Pt.After impact, the specimens were inspected visually and ultrasonically. The results obtained are summarized as follows:(1) There was no remarkable change in apparent stiffness, after impact loading.(2) The specimen damaged under axial compressive load had a larger interior delamination region than the one damage under tensile load, while the back surface of the former specimen showed a smallerr visible region with surface cracks than that of the latter.(3) Both of the damage regions of the back surface and the interior of the specimen became larger with increasing impact velocity.(4) For the case of high compressive load, the residual compressive strength after impact was lower than those for other cases.