Study Of The Impact Injury Of Carbon Fiber Reinforced Polymer Composites In Moist Heat Environment

Carbon Fiber Reinforced Plastics(CFRP) is a high-performance composite. Compared to the metal, CFRP have many advantages, like high specific strength, high specific stiffness,corrosion resistance and designability, which are widely used in the industry. Composite is anisotropic which means the mechanical properties along the direction of fiber are better than perpendicular to the direction. It's often suffered by the impact. The actual service environment of composites is complicated, which often influence the properties of material.Therefore, the environmental factors should be considered in the process of impact.The model of stress-strain theory under the hot and wet condition are analyzed. Then based on the finite element analysis software, the model of impact and hygrothermal for the laminated plate is established. At last analyzed the model and area of damage in different impact energies(20J, 80 J, 130 J, 200J), at different temperatures(20?,80?,120?) and in different moisture rate(dry, 1%, 1.4%). In order to find the effect of the environment for CFRP.The internal residual stress exit in the different conditions. As the temperature and moisture rate increase, the internal residual stress will also increase. The calculation shows the initial damage threshold and failure thresholds in the different hygrothermal environment for the four damage steps in order to make sure that the impact energy are reasonable. The damage area for different ply were gradually increase with the rise of temperature and moisture rate. The area of impact damage are larger in the hygrothermal environment than in a single temperature or moisture rate condition. The property also are weaken than before.