Fatigue life prediction of welded tubular T-joints
It is agreed that fatigue cracking is currently the principal cause of welded tubular joints in engineering structures. It is considerably significant to predict joints fatigue life coupling mechanical loading and corrosion effect when fracture mechanics approach is adopted. The objective is to develop an engineering methodology for fatigue life predictions of engineering welded tubular joints both in air and under water based on experimental results of plate butts and related analysis of tubular joints by means of probabilistic fracture mechanics. According to experimental results the reduced life by corrosion was estimated based on the S-N curves for pure mechanical and corrosion fatigue, and a reduced factor Kr at destination life to characterize the extent of the corrosion effect was established to predict the fatigue life of tubular T-joints. A new SIF (stress intensity factor) expression for surface semi-elliptical cracks in T-joints suitable of tension or in-plane bending loading is proposed according to synthetic analysis of the results attained by finite element method and experiments. Fatigue life predictions of tubular T-joints are well consistent with the fatigue experimental results in corresponding situations both in air and under seawater corrosion environment.
Tubular joints Corrosion Fatigue life prediction
Tong Liu Minshan Liu Qiwu Dong
Thermal energy engineering research center of Zhengzhou University, Zhengzhou 450001, China
国际会议
2011 International Symposium on Structural Integrity 2011国际结构完整性学术研讨会--核工程结构完整性技术 ISSI 2011
合肥
英文
233-236
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）