准静态下Ⅰ型裂纹的断裂准则与切口圆柱形试件的破损评定研究  

A RESEARCH OF THE FRACTURE CRITERION OF CRACK TYPE I UNDER QUASI-STATE AND THE DAMAGE ASSESSMENT OF A CIRCULAR-CUT BAR

作　　者：赵震洋 吴刚[1] 陈泽光 

机构地区：[1]贵州工学院化工系,同济大学地下系,重庆大学工程力学系

出　　处：《贵州工学院学报》1996年第5期47-52,共6页

基　　金："863"计划资助

摘　　要：本文建立了准静态情况下Ｉ型裂纹的断裂准则，提出了新的表面能概念及其表达式。用材料的应力—应变曲线来表示裂纹尖端塑性区耗散能，并建立了裂尖塑性区耗散能与远场应力和临界裂纹长度的关系，通过试验确定了远场应力与临界裂纹长度的幂函数关系。This article establishes a fracture criterion of crack type I under quasi-state conditions and brings forward a new concept and an expression of surface energy. The relationship among the dissipatd energy of the plastic zone near the crack tip and the farther fieldstress and the length of critical crack is expressed by the dissipated energy of the plastic zonenear the crack tip. Through experiment, the power function of farther field stress and thecritical crack length is determined.

关 键 词：准静态 Ⅰ型裂纹 断裂准则 破损评定 裂纹 

分 类 号：O346.1[理学—固体力学]