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Enhanced crack sizing and life estimation for welded tubular joints under low cycle actions

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  • NETL
  • NSTL
  • Elsevier
This study examines the low-cycle fatigue of circular hollow section (CHS) X-joints made of S355 steels, through a combined experimental and numerical investigation, assisted by non-destructive crack sizing methods, namely the Alternating Current Potential Drop and Ultrasonic Phased Array. The comparison of the two methods reveals the discrepancy in the crack sizing, and illustrates the fatigue crack initiation and propagation in CHS joints. This study extends the Improved Modified Neuber's Rule to estimate the local energy indicator for CHS X joints. The numerical analysis implements a continuum damage mechanics method, which estimates fatigue lives of test specimens with reasonable accuracy.

Low-cycle fatigueTubular jointsFatigue crack propagationLocal energy indicatorContinuum damage mechanics

Liuyang Feng、Xudong Qian

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Department of Civil and Environmental Engineering, Centre for Offshore Research and Engineering, National University of Singapore, Singapore 117576, Singapore

2020

10.1016/j.ijfatigue.2020.105670

International journal of fatigue

International journal of fatigue

ISTP
ISSN：0142-1123
年,卷(期)：2020.137(Aug.)
  • 14
  • 57