中国舰船研究Issue(5)：60-68,76,10.DOI:10.3969/j.issn.1673-3185.2014.05.011
基于奇异强度理论的疲劳特性评估方法
Fatigue Characteristics Assessment Method Based on Singularity Strength Theory
摘要
Abstract
Fatigue is a key factor in the destruction of marine structures, and this paper studies the stress intensity of typical sheet structures for corner nodes based on linear elastic fracture mechanics and the notch stress intensity theory to simplify the conventional ship structural fatigue assessment method. Struc-tural analysis is performed by using ANSYS finite element simulation, the MathCAD function fitting, re-search methods of "singular weight function method" and "singular equivalent crack method" to calculate stress intensity factors. Finally, simple algorithms and empirical formulas are given. Then, the fatigue life is calculated based on Paris crack propagation law, and S-N curves are combined to analyze the stress con-centration factors. The relationship between the "singular stress concentration factor" and the "singularity strength"is investigated. Finally, singular stress points for equivalent notch stress are given to realize the fi-nite element analysis. It is hoped that the singular strength theory can be brought into ship structural fa-tigue strength check specification for reference.关键词
疲劳/奇异强度/应力强度因子/等效裂纹/权函数/应力集中/切口应力Key words
fatigue/singularity strength/stress intensity factor/equivalent crack/weight function/stress concentration/notch stress分类
交通工程引用本文复制引用
高嵩,徐丽,Nigel BARLTROP,王大政..基于奇异强度理论的疲劳特性评估方法[J].中国舰船研究,2014,(5):60-68,76,10.基金项目
欧洲联盟成长计划资助项目MARSTRUCT（TNE3-CT-2003-506141）；欧共体第7框架资助项目RISPECT （218499）；国家海洋局基金资助项目 （）
