K节点应力集中系数的试验和数值研究方法.pdf

23 I Vol. 23 Sup. I 2006 6 June 2006 ENGINEERING MECHANICS 79 1000-4750(2006)Sup.I-0079-07 K * 1 2 LIE Seng-Tjhen (1. , 264005; 2. , 639798) S-N S-N K K S-N TU398; O346 A EXPERIMENTAL AND NUMERICAL STUDIES OF THE STRESS CONCENTRATION FACTOR (SCF) OF TUBULAR K-JOINTS * 1 2 SHAO Yong-bo , LIE Seng-Tjhen (1. School of Civil Engineering, Yantai University, Yantai, Shandong 264005, China; 2. School of Civil Environmental Engineering, Nanyang Technological University, Singapore, 639798) Abstract: The most commonly used method to estimate the service life of a tubular joint in offshore engineering is by referring to S-N curves. The hot spot stress (HSS) range along the weld toe is obtained by either numerical method or experimental test if a tubular joint is subjected to fatigue loadings. From a corresponding S-N curve, the number of fatigue loading cycles that the joint can sustain before failure can be predicted according to the HSS range. The HSS range is frequently calculated from a parameter called stress concentration factor (SCF). In this study, numerical and experimental analyses of the SCFs of tubular K-joints subjected to basic loadings were conducted. The stress distributions along the weld toe and the corresponding locations of the peak SCF values of the K-joints subjected to different basic loadings were obtained. Key words: tubular joints; stress concentration factor (SCF); numerical and experimental analyses; fatigue life; S-N curve; hot spot stress ra