Thermal residual stresses in a composite with fiber/matrix interphase

The thermal residual stresses distribution in a composite with interphase was analysed in the paper. A 3D single fiber model with three phases was established based on the materials 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 were calculated based on mechanics of symmetrical elasticity. 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. At last, the electrical resistance method is used to measure the axial thermal residual stress, which compares well with theory result.