Investigation of elastic modulus and morphology of reinforcement phase on the stress distribution of copper matrix composites

摘要

In the present work, the models of composite reinforced by sphere, rod and short fiber with different elastic modulus were established, and the effects of morphology and elastic modulus of reinforcement on mechanical properties were investigated by the finite element analysis. The phase stress partition parameters and stress gradient are used to evaluate the load-transfer efficiency between the reinforcement and matrix. The results revealed that the yield strength increases firstly and then stables with the increase in the elastic modulus of reinforcement. Furthermore, the reinforcements with a larger aspect ratio can induce higher stress gradient and load-transfer efficiency, thereby leading to the increase of yield strength. The effect of the aspect ratio on the yield strength follows the calculation of shear-lag model. Additionally, the aspect ratio and elastic modulus have a synergistic effect on yield strength. The higher aspect ratio reinforcements will make the yield strength of the composite increase significantly with the increasing elastic modulus of the reinforcement. It is anticipated that the present study would provide guidance for the design and underlying performance prediction of metal matrix composites. (C) 2021 Elsevier B.V. All rights reserved.