几种韧性材料的断裂机理及应力参数分析  

FRACTURE MECHANISM AND STRESS PARAMETER ANALYSIS OF SEVERAL DUCTILE MATERIALS

作　　者：韩星明[1] 汤安民[2] 

机构地区：[1]西安理工大学科技处,陕西西安710048 [2]西安理工大学工程力学系,陕西西安710048

出　　处：《陕西科技大学学报（自然科学版）》2008年第1期83-86,94,共5页Journal of Shaanxi University of Science & Technology

基　　金：陕西省自然科学基金资助项目(2005A05)

摘　　要：应用传统强度理论和细观力学方法对几种韧性材料在复合载荷条件下的断裂机理、启裂位置、开裂方向进行了实验分析和应力场计算.结果表明,对应于不同的应变硬化率和复合比,韧性材料的断裂形式和断裂机理会发生变化;钝化变形区应力三维度最大处和锐化变形区剪应力最大处是裂纹的启裂位置;根据启裂点上的最大拉应力方向或最大剪应力方向可预测裂纹的开裂方向;应力状态及相关参数的临界值可作为断裂过程的控制参数.In this paper, fracture mechanism, position and direction of crack initiation of mixed mode fracture in several ductile materials are tested, and stress distributions of which are analyzed. With which, it could be concluded that： corresponding with different train hardening rate and complex ratio, fracture form and mechanism could be changed; the position of maximum of stress triaxiality in blunted zone and maximum of shear stress in sharpened zone could be crack initiation position; the direction of maximum tensile stress and maximum shear stress at the point of initiation could be crack initiation direction; the critical value of stress state and related stress parameters can be served as controlling parameters of fracture procedure.

关 键 词：韧性材料 断裂机理 启裂位置 开裂方向 

分 类 号：TG111.91[金属学及工艺—物理冶金] TH123.4[金属学及工艺—金属学]