陶瓷颗粒增强铝基复合材料残余应力的多尺度模拟OA

This study was to investigate the effective elastic response characteristics and residual stress evolution mechanism of ceramic particle-reinforced metal matrix composites,and an innovative multiscale elastic response model incorporating the effective representative volume elements was constructed through a multi-scale modeling strategy to achieve a cross-scale correlation from micromechanical elastic response to the macroscopic mechanical behavior.The effective elastic properties and residual stresses of composites with varying A356 contents were theoreti-cally predicted by taking Al2O3/A356 composites as an example.The results are shown that the effective elastic constants of composites gradually decrease with the increasement of A356 contents,exhibiting a distinct softening effect.Under mechanical loading to the composites,there is compressive stresses in the Al2O3 metal phase,and the compressive residual stress in the composites varies with the A356 in a nonmonotonic pattern of first increasing and then decreasing.These predicted values of the effective elastic properties and residual stresses show a good agreement with experimental measurements,validating the accuracy of the proposed model,which provides a theoretical founda-tion for the forward design and performance optimization of composites.