SiC_(p)/Mg-6Zn-3Al复合材料力学行为有限元建模研究  

Finite Element Modelling of Mechanical Behavior of SiC_(p)/Mg-6Zn-3Al Composites

作　　者：白淑英 王冲 郭恩宇 陈宗宁[1,2] 康慧君 王同敏 Bai Shuying;Wang Chong;Guo Enyu;Chen Zongning;Kang Huijun;Wang Tongmin(Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology;Ningbo Institute of Dalian University of Technology)

机构地区：[1]大连理工大学材料科学与工程学院辽宁省凝固控制与数字化制备技术重点实验室 [2]大连理工大学宁波研究院

出　　处：《特种铸造及有色合金》2023年第12期1620-1627,共8页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51974058,52022017,U22A20174,51927801)。

摘　　要：针对SiC_(p)/Mg-6Zn-3Al镁基复合材料,建立了基于真实微观组织的二维有限元力学分析模型,采用模拟和试验相结合的方法深入研究了复合材料的变形和断裂行为,以及颗粒尺寸对材料力学性能的影响。结果表明,随着颗粒尺寸增加,复合材料的强度、塑性及加工硬化率均有下降。模拟分析表明,平面应变加载下模拟曲线与试验结果较吻合,拉伸过程中应力集中多发生在颗粒尖角及凹陷处;应力和应变均沿与拉伸方向呈45°“X”状分布,中心处应力或应变的叠加会导致其成为裂纹源的形核位置。裂纹沿着高应力或应变区域扩展,导致局部区域应力的释放。颗粒尺寸的增加导致材料性能降低的本质在于大尺寸颗粒的载荷传递效果大幅降低。A two-dimensional finite element mechanical analysis model based on real microstructures was established for SiC_(p)/Mg-6Zn-3Al magnesium matrix composites.The deformation and fracture behavior of the composites and the influence of grain size on mechanical properties were investigated intensively by combining simulation and experiment.The results indicate that the strength,plasticity and work hardening rate of the composites are all decreased with the increase of grain size.The simulation analysis reveals that the simulation curve under plane strain loading is in consistent with the experimental ones,and stress concentration often occurs in the sharp corners and depressions of grain during the tensile process.The stress and strain are distributed in an“X”shape along 45°from the tensile direction,and the superposition of the stress or strain at the center become the nucleation location of crack source.The crack is propagated along the high stress or strain area,leading to the release of local regional stress.The essence of grain size increase resulting in the property reduction is the great decline of load transfer effect of large grain.

关 键 词：镁基复合材料 力学性能 有限元模拟 平面应力 平面应变 

分 类 号：TB331[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—物理冶金]