鋼球衝突を受けたCFRP積層板の層間はく離と残留応力

抄録

Carbon Fiber Reinforced Plastics (CFRP) is one of composite materials. CFRP is superior in the specific strength and rigidity, which is useful in the fields required to reduce the weight of products. However, CFRP have a problem causing delamination between layers by the impact. Invisible delaminates may cause a serious incident. The impact tests that produce the delamination in the CFRP laminate are made using an air-gun system. CFRP laminates being subjected to bending and twisting loads are imposed on the impact load at each temperature of 298K, 403K and 85K. Scanning Acoustic Microscopy (SAM) is utilized for detecting the delamination area of CFRP laminates. The residual strength of the damaged CFRP laminates is examined by using the three point bending device. The residual strength of the damaged laminates decreases linearly with increasing delamination area. The largest area of delamination is observed at 7/8 layer, and the tendency is more effective at low temperature ranges. The effect of the bending stress is more critical on the delamination and the residual strength of the CFRP laminates.