Prediction of Three Dimensional Crack Path Brittle Fracture in Weldment under Dynamic Load  

作　　者：YANG Da-peng PAN Hai-yang ZHAO Yao LI Tian-yun 

机构地区：[1]Mechanical Engineering Department,Zhengzhou Technical College [2]School of Naval Architecture & Ocean Engineering,Huazhong University of Science and Technology [3]Urban Rail Transport Department,Zhengzhou Technical College

出　　处：《International Journal of Plant Engineering and Management》2016年第2期115-128,共14页国际设备工程与管理（英文版）

基　　金：supported by National Natural Science Foundation of China(No.91016026);Henan Province Natural Science Foundation Subsidy Project(No.152300410003)

摘　　要：Three dimensional dynamic stress intensity factors are analyzed for a curved crack with a second order perturbation method. The method is extended to obtain an approximate representation of a three dimensional dynamic stress intensity factors at the tip of a curved crack. Due to three dimensional curved crack growth the dynamic energy release rate can be calculated by using the Irwin＇s formula. A three dimensional curved crack in materials with inhomogeneous fracture toughness are considered. Paths of a brittle three dimensional curved crack propagating along a welded joint are predicted via the present method, where the effects of dynamic applied stresses, residual stresses, and material deterioration due to welding are taken into considerations.Three dimensional dynamic stress intensity factors are analyzed for a curved crack with a second order perturbation method. The method is extended to obtain an approximate representation of a three dimensional dynamic stress intensity factors at the tip of a curved crack. Due to three dimensional curved crack growth the dynamic energy release rate can be calculated by using the Irwin＇s formula. A three dimensional curved crack in materials with inhomogeneous fracture toughness are considered. Paths of a brittle three dimensional curved crack propagating along a welded joint are predicted via the present method, where the effects of dynamic applied stresses, residual stresses, and material deterioration due to welding are taken into considerations.

关 键 词：three dimensional dynamic stress intensity factor curved crack second order perturbation method dynamic energy release rate 

分 类 号：TG404[金属学及工艺—焊接]