弯曲载荷作用下鳍形壳典型周期性裂纹应力强度因子  

STRESS INTENSITY FACTORS OF TYPICAL PERIODIC CRACKS IN FIN-SHAPED SHELL UNDER BENDING

作　　者：袁玮骏 谢禹钧[2] YUAN WeiJun;XIE YuJun(College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao 266580,China;School of Mechanical Engineering,Liaoning Shihua University,Fushun 113001,China)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,青岛266580 [2]辽宁石油化工大学机械工程学院,抚顺113001

出　　处：《机械强度》2021年第2期412-417,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(50771052,50971068,11272141)资助。

摘　　要：不同载荷下含裂纹工程构件的应力强度因子是断裂分析的核心问题之一。细长的鳍形壳具有壳和梁的双重特性,在其横截面上常会出现一些典型周期性裂纹,如周期性鳍上裂纹和环向裂纹。在弯曲作用下,裂纹尖端附近会出现不同的奇异应力场。从守恒定律和初等力学出发,提出了一种简单易懂的确定应力强度因子的方法,该方法计算的应力强度因子与有限元计算结果吻合良好。Stress intensity factor(SIF)for cracked engineering structures under different loading is one of the core issues of fracture analysis.A slender fin-shaped shell possesses both shell and beam characteristics,in the cross-section of which some typical periodic cracks,such as the periodic cracks on fins and circumferential cracks,may arise usually.There will be different singular stress fields next to crack tips for a cracked fin-shaped shell under bending.Based on the conservation law and the elementary mechanics,a technique to determine SIFs has been proposed in this article,which is simple and easy to understand.The SIFs calculated by using of the present method agree well with the FEM results.

关 键 词：守恒律 应力强度因子 鳍形壳 裂纹 有限元法 

分 类 号：TE905[石油与天然气工程—石油机械设备] O346.1[理学—固体力学]