基于ANSYS的颗粒增强镁基复合材料应力场分析

Stress field analysis for particle reinforced magnesium matrix composites based on ANSYS

为了更加符合实际地研究颗粒增强镁基复合材料的应力场分布情况,应用ANSYS有限元软件中的APDL语言建立含有三维随机颗粒的复合材料模型,根据细观力学和有限元理论,对模型在单向拉伸下的应力场进行模拟,分析其应力以及应变的分布情况和复合材料的性能特征,通过ANSYS模拟得到复合材料颗粒中的应力最大而应变最小这一结果.通过改变基体内的颗粒粒径,分析了颗粒粒径对预测应力应变曲线的影响.结果表明,当颗粒粒径到达一定值后,颗粒粒径的减小对复合材料的力学性能影响很小.

In order to study the stress field distribution of particle reinforced magnesium matrix composites more practically,the composite model including three-dimensional random particles was established with APLD language in the ANSYS finite element software. According to the micromechanics and finite element theory,the stress field under uniaxial tensile condition was simulated in the model. In addition,the distribution of both stress and strain as well as the performance characteristics of composites were analyzed. Through the ANSYS simulation,it is found that the stress is the maximum in the particles of composite,but the strain is the smallest. Through changing the diameter of particles within the matrix,the effect of diameter of particles on the predicted stress-strain curve was analyzed. The results indicate that when the diameter of particles reaches to a certain value,and the decrease in the diameter of particles has very small effect on the mechanical properties of composites.