【摘要】 利用三维有限元方法 ,通过建立立方体、六棱柱单位胞体数值分析模型 ,对颗粒增强复合材料做模拟计算 .在单向外载荷作用下 ,讨论两模型中正应力、vonMises应力的分布规律 .结果显示两模型的应力场分布相近或相似 ,将在相同的区域里发生材料剪切屈服和界面脱胶破坏 .计算了复合材料弹性系数 ,经过同整体体积平均分析方法和实验测量结果的比较 ,结果显示六棱柱模型较立方体模型更加符合真实情况 .更多还原

【Abstract】 By assumption of periodical distribution of uniformed particles in size and shape, both hexagonal and cubic cell models were constructed to study mechanical properties of particle-reinforced composites by using three-dimensional finite element method. The distributions of von Mises and direct stress directly leading to shear yield and interfacial debonding were discussed under uniaxial applied force. There were similar stress field in two models and shear yield and interface debounding took place in the same areas. The predicting values of overall Young’s modulus and shear modulus were obtained. The Ju’s ensemble volume average technique was also involved for result comparing, and the experimental data were available for verification. According to numerical simulation and comparison with the experimental measurement and empirical formula, the hexagonal model was found to be more reasonable as a representative element for description of particle-reinforced composite.更多还原