7 Evaluation of the Influence of Water Absorptivity on the Properties of CFRP Cylinder Materials by SHPB Impact Compression Test 65 Fig. 7.7 Description of image Fig. 7.8 Destruction of specimen smaller than that before water absorption, indicating that the compressive strength decreased due to the softening of resin and fiber. Finally, fracture process of specimen was observed by using high-speed camera. Figure 7.8a and b are shown fracture specimen both before and after water absorption, respectively. The specimen fractured in the 45◦ direction regardless of the water absorption ratio. Therefore, the water absorption has no significant effect on the fracture behavior and fracture mode of CFRP. 7.5 Conclusion In this study, the effects of water absorption ratio on strain rate and compressive strength were investigated experimentally by using the SHPB test method at a strain rate of 200~1000s−1. The compressive strength exhibited strain rate dependence regardless of the water absorption ratio of specimen. In addition, the compressive strength of the specimen decreased due to water absorption, and the strain rate dependence was reduced. Finally, the fracture of CFRP both before and after water absorption was observed by using the high-speed camera.
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