Abstract：The thermal residual stresses distribution in a composite with interphase was analysed in this article. A 3D single fiber model with three phases was established based on the material’s micro structure. Homogeneous and gradient functions were used to simulate the Young’s modulus variations in the interphase region. Single fiber model’s residual stresses was calculated based on mechanics of symmetrical elasticity. The result shows that gradient interphase of T300/epoxy reduces the residual stresses, and close to experimental value by electrical method . Fields superposition method was used to get the coupled stress field in representative volume element(RVE) of close-packed hexagonal structure. This theory is verified by FEA.
2010, Vol. 31 
