【摘要】 采用内聚力模型研究颗粒增强金属基复合材料近邻颗粒间的应力及应变分布。结果表明,复合材料的应变主要集中于基体上,在加载路径上存在一个应变较高的区域,从而促进了颗粒极点附近空洞的形成。基体的应力和应变都随着基体与增强颗粒距离的增大而减小。模拟结果表明,增强颗粒之间的相互影响有一个临界距离,而且这个临界距离会随粒径的增大而增大。此外,加载方向和颗粒的中心线夹角对应力和应变的分布也有一定的影响,当加载方向和颗粒的中心线夹角为0°时,颗粒之间的相互影响最大,其夹角为45°时颗粒之间的相互影响最小。更多还原

【Abstract】 The distribution of stress and strain between adjacent particles in particulate reinforced metal matrix composites was investigated using cohesive zone models. It is found that the strain of the composite is concentrated in the matrix, and there is a region with higher strain along the loading path, which can promote the formation of a void near the particles pole. The stress and strain in matrix near the particles gradually decrease with the increase of the distance between particles. And it is calculated that there is a critical distance within which the stress and strain fields of the neighboring particles can influence with each other. This critical distance increases with the increase of particle size. It is also found that the angle between the tensile direction and the center line of particles plays an important role in the stress and strain distribution. The model with the angle of 0° has the greatest influence on the distribution of stress and strain in the matrix, while the model with the angle of 45° has the least influence on the distribution of stress and strain in the matrix.更多还原