Study on Crack Closure Considering Welding Residual Stress Under Constant Amplitude Loading and Overloading  

常幅和过载下考虑焊接残余应力的裂纹闭合效应研究

作　　者：Ziya Peng Ping Yang Kang Hu Yueling Song 彭子牙;杨平;胡康;宋月林(Departments of Naval Architecture,Ocean and Structural Engineering,School of Transportation,Wuhan University of Technology,Wuhan,China;Key Laboratory of High Performance Ship Technology(Wuhan University of Technology),Ministry of Education,Wuhan 430063,China)

机构地区：[1]Departments of Naval Architecture,Ocean and Structural Engineering,School of Transportation,Wuhan University of Technology,Wuhan,China [2]Key Laboratory of High Performance Ship Technology(Wuhan University of Technology),Ministry of Education,Wuhan 430063,China

出　　处：《Journal of Marine Science and Application》2020年第2期195-207,共13页船舶与海洋工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 51779198)

摘　　要：Welding residual stress in the engineering structure has a non-negligible influence on crack propagation,and crack closure is a significant factor affecting the crack propagation.Based on the elastoplastic finite element method and crack closure theory,we studied crack closure and residual compressive stress field of butt-welded plates under constant amplitude loading and overloading regarding the stress ratio,maximum load,overload ratio,and number of overloads.The results show that the welding residual tensile stress can decrease the crack closure because of a decrease in the residual compressive stress in the wake zone,but the effect is gradually reduced with increased stress ratio or maximum load.And the combined effect of welding residual tensile stress and overload can produce a stronger retardation effect on crack propagation.

关 键 词：Welding residual stress Crack closure OVERLOADING Crack propagation Butt-welded plate 

分 类 号：U671.8[交通运输工程—船舶及航道工程] U661[交通运输工程—船舶与海洋工程]