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采用复合材料细观有限元分析方法,并借助先进循环塑性本构模型的有限元实现,对颗粒性态的随机性对SiC颗粒增强6061Al复合材料棘轮行为的影响进行了有限元数值模拟。采用随机序列吸附方法(RSA)生成各种多颗粒随机分布的模型,探讨了颗粒分布方式、数目、形状和大小以及各自的随机性对复合材料棘轮行为的影响。研究发现:颗粒尺寸越小、数目越多、分布在基体表面的比例越大,颗粒的增强效果越好;颗粒的大小和空间位置分布越均匀,复合材料抗循环变形的能力越强;球形颗粒和均匀分布的假设可以得到很好的模拟结果。
By means of the finite element method of composite material and the finite element method of advanced cyclic plastic constitutive model, the influence of the randomness of particle state on the ratcheting behavior of SiC particle reinforced 6061Al composite was simulated by finite element method. A series of randomly distributed models of multiple particles were generated by random sequence adsorption (RSA). The effects of particle distribution, number, shape and size, and their randomness on the ratcheting behavior of the composite were discussed. The results show that the smaller the particle size and the larger the number, the larger the proportion distributed on the surface of the substrate, the better the particle reinforcement effect; the more uniform the size and spatial distribution of the particles, the stronger the ability of the composite material to resist cyclic deformation; And uniform distribution of assumptions can get good simulation results.