Alternative StressBased Creep Properties of CFRPWood Composite Materials

The alternative stress based bending resistant experiment was applied to study the short term bending creep performance of carbon fibre reinforced polymer (CFRP) under both dry and wet environmental conditions. The results showed that the Burger Model could precisely simulate the shortterm bending creep performance of the composite material. Under the wet condition, the creep change amount of the composite material was significantly larger that of under the dry condition. It was showed that both of the relative humidity and temperature were important factors to affect the creep change. When the stress change cycle was 1h, the creep change under alternative stress was slightly lower than that of under the constant stress, indicating that the alternative stress did not accelerate the creep change process. The maximum creep change rate occurred under wet environmental condition with high stress level which led to the fracture of the composite material within short time. The environmental conditions and stress level should be integratedly considered while designing and applying the composite material. The stress level should be controlled to be within 40% of the maximum value.