结构钢断裂试验及数值分析  

Fracture Test and Numerical Analysis of Structural Steel

作　　者：王万祯[1] 张建军[1] 张丹丽[2] 李松[1] 

机构地区：[1]兰州理工大学土木工程学院,730050 [2]华北水利水电学院水利职业学院土木系,郑州450008

出　　处：《特种结构》2009年第1期49-51,共3页Special Structures

基　　金：国家自然科学基金(50808098);甘肃省教育厅科研基金(0603-09)

摘　　要：为探寻结构钢宏观韧、脆断机理及抗断设计,对10个结构钢开孔板进行了单向拉伸断裂试验。试验显示,初始开裂点位于应力集中较为明显的孔边。试验中还较为精确地测量了初始微观开裂时的加载位移及全程载荷—位移曲线,为研究结构钢断裂机理和抗断设计准则提供了较为可靠的试验依据。通过对数值模拟初始开裂点的应力场分析,对比验证了某开裂准则的适用性,并回归修正了结构钢在应力三轴空间延性开裂强度的近似公式。In order to study on fracture mechanism and fracture design, 10 flat rectangular plates with circular hole were tested subjecting to tensile loads. The first crack located at the edge of hole that the stress concentrated. The displacements of first micro crack and the whole curves of load-displacements were also quite accurately measured. The experiments gave much reliable evidence for put forward fracture mechanism and fracture criterion of constructional steel. By analyzing stress field of first crack deduced from numerical simulation, the applicability and precision of a certain crack formation criterion of ductile material was studied. At last, ductile fracture strength of constructional steel in stress triaxiality space was regressed.

关 键 词：结构钢 开孔板 断裂机理 应力三轴空间 

分 类 号：TU391[建筑科学—结构工程]