Abstract
Abstract The influence of the moisture and heat environment on the bending properties of CFRP laminates and CFRP reinforced foam sandwich structures was studied by mass change and three-point bending test. The results show that the saturation moisture absorption rate of CFRP laminates is low, only 0.62%. The CFRP reinforced foam sandwich structure exhibits a saturation moisture absorption rate of 1.48%. Humidity and heat have little effect on the bending modulus of CFRP laminates but have some effect on the bending strength, which decreases by 13.23% compared with normal temperature and dry conditions. The flexural strength and average energy absorption of CFRP reinforced foam sandwich structure decreased by 11.5% and 5.56% under hot and humid environments. The flexural fracture of the CFRP foam sandwich structure is smooth under normal temperatures and dry conditions. Many fibers are pulled out, and the resin falls off, obviously under hot and humid environments. The stratification of CFRP panels and foam cores in hot and humid environments is more obvious than in dry conditions at normal temperatures.
Published Version
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