大连理工大学学报2025，Vol.65Issue(4)：354-362,9.DOI:10.7511/dllgxb202504004
基于改进片条合成法的有限板表面裂纹张开位移研究
Research on surface crack opening displacement of finite plates based on improved slice synthesis method
摘要
Abstract
For ship structures,initial defects in stress concentration areas under fatigue loading are prone to develop into semi-elliptical surface cracks,and solving the crack opening displacement is very important for studying the propagation mechanism of fatigue cracks.An improved slice synthesis method is proposed for calculating the surface crack opening displacement of finite plates under elastic conditions.Firstly,numerical solutions of displacement are obtained using the slice synthesis method.Then,mesh models with different crack depth-to-length ratio(a/c),relative crack depth(a/t)and relative crack length(c/w)are established to obtain finite element solutions.Comparison result shows that the traditional slice synthesis method has limitations in the reasonable range of surface crack shapes.By fitting parameters to improve the traditional slice synthesis method,the displacement results under one-dimensional and two-dimensional stress distributions of one to three powers are verified,and the applicable surface crack shape ranges are obtained:0.25≤a/c≤1.00,0.05≤a/t≤0.40,0.05≤c/w≤0.50.The improved slice synthesis method can be used for the calculation of surface crack opening displacement and residual fatigue life prediction of finite plates under complex stress distributions.关键词
改进片条合成法/表面裂纹/裂纹张开位移Key words
improved slice synthesis method/surface crack/crack opening displacement分类
交通工程引用本文复制引用
吴剑烽,袁奎霖..基于改进片条合成法的有限板表面裂纹张开位移研究[J].大连理工大学学报,2025,65(4):354-362,9.基金项目
国家自然科学基金资助项目(52001058). （52001058）
