SiC_p增强镁基复合材料微区应力场的仿真模拟

ANALOG SIMULATION OF LOCAL STRESS FIELD IN SiC_p REINFORCED MAGNESIUM MATRIX COMPOSITES

采用有限元方法仿真模拟了SiC颗粒(SiCp)增强镁基复合材料中实际形状的增强体周围的微区应力场.结果表明,不同形状的增强体颗粒附近的微区应力场差异很大,个别颗粒会在低应力下失效.当增强体的体积分数较少时,每个增强体的微区应力场受其它增强体影响不大,近似给出单个增强体的形状就可以仿真模拟增强体附近的微区应力场.利用粉末冶金法制备了颗粒增强镁基复合材料,观察其拉伸断口,并利用有限元方法进行仿真模拟,据此进行了增强体颗粒的失效分析.

The local stress field of actual particles in magnesium matrix composites reinforced with Sic particles (SiCp) was simulated using the finite element method. The result suggests that the local stress fields of particles with different shapes have great difference and some particles may fail under a lower stress. If the volume fraction of particles is less, other particles have little influence on the local stress field of a certain particle. Therefore, the local stress field of a particle with a given shape can be simulated. Magnesium matrix composites reinforced with SiCP were prepared by powder metallurgy. Fracture analysis was performed and was compared with the particle failure analysis carried out by finite element method.