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根据电镜断面考察结果,以Gurson模型为本构方程的有限单元法对包体模型及三维非均匀模型进行了详细分析.为了评价应力-应变关系及损伤的主要因素,考虑了基体中SiC粒子的体积率和径比的非均匀分布.其结果表明,用这种非均匀模型能很好地仿真铝基体在大量塑性变形之后所发生的韧窝破坏过程.SiC粒子体积率、径比及其位置的非均匀性,对局部和整体损伤过程与应力-应变关系的影响相当大.当Sic粒子径比为1.0,并在基体中均匀分布时,断裂应变会大幅度增大.
According to the results of SEM, the Gurson model was used as the finite element method to analyze the inclusion model and the three-dimensional heterogeneous model in detail.In order to evaluate the stress-strain relationship and the main factors of damage, the SiC particles Volume ratio and diameter ratio.The results show that this kind of inhomogeneous model can well simulate the dimple destruction process of aluminum matrix after a large amount of plastic deformation.The volume fraction and diameter ratio of SiC particle and its position Which has a great influence on the local and global damage process and the stress-strain relationship.When the particle-diameter ratio of Sic is 1.0 and uniformly distributed in the matrix, the fracture strain will increase greatly.