颗粒增强镁基复合材料细观力学场的数值模拟分析  

Numerical Simulation Analysis on Micro-mechanical Characteristics of Titanium Particle Reinfored Magnesium Matrix Composites

作　　者：郗雨林[1] 武创[1] 刘国元[1] 张新杰[1] 

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《材料开发与应用》2012年第2期28-31,共4页Development and Application of Materials

摘　　要：本文借助有限元数值模拟,研究了颗粒增强镁基复合材料的细观力学特征。结果表明,等效应力、应力球量、功耗、最大主应力和最大主应变存在明显的集中现象。尽管外力小于基体的屈服强度,但应力集中可使基体发生微区屈服。复合材料主要的失效形式为界面脱粘和基体开裂,同时,细观力学分析说明,增强体的强化作用主要来自于它对基体应力、应变状态的改变,而不是其本身对形变功的分担。The micro-mechanical characteristics of a particulate reinforced magnesium matrix composite was analyzed by FEM simulation. The results showed that such mechanical parameters as Mises equivalent stress, stress spherical tensor, deformation- energy consumption, maximum principal stress and maximum principal strain concentrated markedly in some local areas. The stress concentration might cause local yielding although the loaded force was smaller than the matrix yielding strength. Local in- terface debonding and matrix cracking are main failure modes in the composite. Moreover, micro-mechanics analysis revealed that the strengthening effect of particulate reinforcements comes mainly from its effect on the stress and strain distribution in matrix, and secondarily from its consumption of the deformation work.

关 键 词：有限元数值模拟 细观力学 镁基复合材料 

分 类 号：TG113.25[金属学及工艺—物理冶金] TG146.22[金属学及工艺—金属学]