基于切口应力强度理论的135°拐角处应力场分析（英文）  

Stress Field Analysis of 135-degree Sharp Corners Based on Notch Stress Strength Theory

作　　者：谌伟[1] 严仁军[1] Nigel BARLTROP 杨平[1] 刘恩骞 秦恺[1] 

机构地区：[1]武汉理工大学交通学院船舶与海洋工程系,高速船舶工程教育部重点实验室,武汉430063 [2]斯特莱斯克莱德大学船舶与海洋工程系,英国格拉斯哥G40LZ

出　　处：《船舶力学》2015年第3期273-283,共11页Journal of Ship Mechanics

基　　金：Supported by The National Natural Science Foundation of China(Grant No.51479153);The Fundamental Research Funds for the Central Universities(No.2013-JL-007)

摘　　要：在焊接接头处,几何的不连续造成了局部的应力集中,形成了应力奇异效应,有必要做进一步的研究。文章基于切口应力强度理论,引入了奇异强度as的概念,提出了评估切口应力的简便算法,并通过一系列十字形模型进行了验证。最后,将修改表达式的预估结果同N-SIF公式作了对比分析,结果表明该修正公式可以简单、准确地预估焊接接头处的应力。There is a need to better understand the stress singularity effect of welded joints with con-sideration of the geometrical factors that produce locally high stresses. Based on notch stress strength theory, this paper presents a simple method using the singularity strength ‘as’ for estimating the stress field distribution at the corner. Validity of this method is further verified by analyzing the stress results for a series of cruciform models. Finally, comparisons are made between the results of this modified method and the corresponding N-SIF formula. The results show that the proposed method has the additional advantage in simple and accurate stress estimation for welded joints.

关 键 词：135°拐角 应力奇异性 奇异强度(as) 切口应力强度因子(N-SIF) 

分 类 号：U663.2[交通运输工程—船舶及航道工程]