Thermal residual stress in metal matrix composite

When a metal matrix composite is cooled down to room temperature from the fabrication or annealing temperature, residual stresses are induced in the composite due to the mismatch of the thermal expansion coefficients between the matrix and fiber. An investigation was undertaken of the magnitude of the thermal residual stresses by determining the difference of the yield stresses (Δσy) between tension and compression resulting from the thermal residual stresses. A theoretical model based on the Eshelby's method was then constructed for the prediction of the thermal residual stresses and Δσy. The agreement obtained was very good between the experimental results and the theoretical predictions.

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