Abstract
An analytical model is proposed to predict thermal stresses at the fiber-matrix interface in continuous-fiber-reinforced composites. First, the initial imperfections in fiber layout are introduced, which are assumed to be the extensional fiber misalignment and the local fiber misalignment respectively. Then, the displacement fields subjected to thermal loadings are found for the two cases. The former is based on Timoshenko beam theory and classical elasticity and the latter based on variational principles. Finally, the thermal residual stresses are determined using the linear stress-strain relationships. Numerical results show that temperature drop will result in residual shear stress at the fiber-matrix interface that can cause debonding and micro-cracks in matrix. This study is extremely useful to understand the microscopic failure mechanism for fiber-reinforced composites.
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