Stress Concentration at a Screwy Welded Seam of Pressured Cylindrical Tube Due to Angular Distortion
Zhang Tianzhong(1,2) Guo Wanlin(2,3) Yang Zheng(2)
Li Guoqiang(1) Zhao Xinwei(4)
(1 College of Civil Engineering, Tongji University, Shanghai 200092, China)
(2 State Key Laboratory of Mechanical Structural Strength and Vibration, Xi'an Jiaotong University, Xi'an 710049, China)
(3 Department of Aircraft Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
(4 Tubular Goods Research Center of China National Petroleum Corp., Xi'an 710061, China)

Abstract: Cylindrical tube with a screwy welded seam subjected to internal pressure loading may result in a local angular distortion (such as peaking). Although the problem of peaking at the longitudinal welded joint had been studied quite extensively, a cylinder subject to peaking distortion at the screwy welded joint remains open because of its three-dimensional complex stress state. A simple model to predict the stress concentration factor for screwy welded joint is presented in this paper. The results are explicit so the procedure of prediction is convenient to use in engineering application. A systematic numerical analysis has been conducted with finite element code of ABAQUS 5.8 to validate the present model. The comparison shows good agreement.
Keywords: Tube, screwy welded joint, peaking, stress concentration.