管节点与船舶甲板结构中疲劳裂纹扩展方向的研究  

PROPAGATION DIRECTION STUDY OF FATIGUE CRACKS IN TUBULAR JOINTS AND SHIP DECK STRUCTURES

作　　者：钱仍 责力 

机构地区：[1]上海交通大学

出　　处：《海洋工程》1996年第1期82-88,共7页The Ocean Engineering

摘　　要：线性断裂力学中研究裂纹的扩展通常用应力强度因子的断裂准则，但是对复合型裂纹，应力强度因子理论就发生了困难。本文用光弹性方法求得裂纹前缘的应力强度因子，然后用应变能密度因子理论研究了船舶大开口舱口角隅处疲劳裂纹和Ｔ型管节点热点处表面裂纹的扩展规律和方向。The fracture criterion of Stress Intensity Factor is usually applied to study the propagation of fatigue cracks. However, it would meet difficulties while it is used to study the growth of the cracks that are subjected to mix mode loading. In the present paper, the photoelasticity experiment and the strain energy density factor theory are combined to study the propagation direction of fatigue cracks under mix mode loading. Two growth profiles that includes a surface crack at hot spots in the tubular T joints and two propagation loci of fatigue cracks at the hatch corner in two types of large opening deck models have been obtained with satisfactory results.

关 键 词：裂纹扩展方向 疲劳应变能 密度因子 

分 类 号：O346:U663.6[理学—固体力学]