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运用空间轴对称弹塑性有限元方法和混合律模型，推导出应力应变分配系数的解析表达式，并由此提出了一种新的定义复合材料比例极限和屈服强度的方法，进而研究了材料参数（纤维长径比、纤维体积分数、纤维根间距和基体应变硬化指数）对短纤维金属基复合材料拉伸变形行为的影响．研究表明，应力应变分配系数及其变化速率可以定量描述复合材料的屈服行为及应力分配作用；低应变阶段的应力应变分配系数与复合材料弹性模量之间存在确定的关系．该方法可以反映出材料参数对复合材料屈服行为的影响，预测的弹性模量和屈服强度与实验结果及Ｅｓｈｅｌｂｙ模型吻合很好。
The analytical expression of stress-strain distribution coefficient is deduced by means of space-axisymmetric elasto-plastic finite element method and mixed-law model, and a new method to define the proportionality limit and yield strength of composite material is proposed. Then, (Fiber aspect ratio, fiber volume fraction, fiber root spacing and matrix strain hardening index) on the tensile deformation behavior of short fiber metal matrix composites. The results show that the stress-strain distribution coefficient and its rate of change can quantitatively describe the yield behavior and stress distribution of the composites. There is a definite relationship between the stress strain distribution coefficient and the elastic modulus of the composites in the low strain stage. The method can reflect the effect of material parameters on the yield behavior of composites. The predicted elastic modulus and yield strength are in good agreement with the experimental results and the Eshelby model.