CFRP積層板端部への衝撃付与による損傷形状と残存圧縮強度との関係

抄録

Impact damage characteristics and compression after edge-on impact (CAEI) strength of CFRP laminates were experimentally investigated. CFRP laminates with various thicknesses and stacking sequences were prepared. Impact tests with a constant energy level were performed using the special impact fixtures. The damaged areas and their shapes after the impact on the CFRP laminates were evaluated using an ultrasonic C-scanning machine. It was observed that the CFRP thickness affected the impact delamination shape, which was expressed by the longitudinal (w) and transverse-direction (d) extensions. The delamination was propagated in the longitudinal direction when the CFRP laminates were thinner. After the C-scope observations of the delamination, compression strength tests were performed. The CAEI strength degraded when the delamination shape factor (w/d) was increased. A correlation between the CAEI strength and increased volume of the CFRP laminates was also observed after the edge-on impact.