脆性材料单压时断裂机理与强度尺寸效应的试验研究  

Test Research on the Fracture Mechanics and the Size Effect of Strength for the Brittle Materials

作　　者：刘天鹏[1] 师俊平[1] 汤安民[1] 马凯[1] 

机构地区：[1]西安理工大学理学院,陕西西安710048

出　　处：《西安理工大学学报》2006年第3期307-310,共4页Journal of Xi'an University of Technology

基　　金：陕西省自然科学基金资助项目(2002A05)

摘　　要：通过两种试验方案,研究了脆性材料HT200在压缩过程中的启裂点、断裂方向以及强度的尺寸效应。结果表明,脆性材料HT200单轴压缩时,启裂点位于应力三维度最大值处即试件中部,断裂方向为最大剪应力方向;不同尺寸的试件,其单轴抗压强度不同的主要原因是端面约束影响范围的大小不同所造成的。By the two test schemes, the point of crack initiation,the fracture direction and the size effect of strength of brittle material HT200 in the process of compression are studied. The result shows,when brittle material of cast iron HT200 bears the uniaxial compressive force, the position of crack initiation is at the place of maximum stress triaxiality; i.e. in the middle of testing piece, and the direction of crack initiation is the direction of maximal shear stress at the dangerous point; and the reason why the uniaxial compression strength is different for different size testing piece is friction effect at the end of samples.

关 键 词：脆性材料 启裂点 断裂方向 应力三维度 

分 类 号：O346.1[理学—固体力学]