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Combine S-N curve and fracture mechanics for fatigue life analysis of welded structures
魏国前, OdsurenOchbileg, 岳旭东, 党章1,2
1.1. ;2.
2.
摘要:
Based on the evolution of fatigue cracks in welded structures, the fatigue life of welded structures was defined as the sum of the crack initiation life Ni and the crack propagation life Np. Correspondingly, a fatigue-life analysis method combining S-N curves and fracture mechanics theory was proposed. The equivalent structural stress method and the lower 99% boundary of the master S-N curve were used to evaluate Ni, and cracks at the end of the initiation stage were considered as semi-elliptical surface cracks. Moreover, Paris equation and the stress intensity factor range of the cracks were used to evaluate Np. Furthermore, the fatigue test results obtained from the running girder of cranes were used as a reference for comparison and verification of the results. The results revealed that the equivalent structural stress is a good indicator for the crack initiation behavior of complex welded structures. In addition, the predicted fatigue life corresponded closely to the testing life.
关键词:  welded structures|fatigue life|equivalent structural stress|S-N curve|fracture mechanics
DOI:10.12073/j.cw.20190623002
分类号:
基金项目:
Combine S-N curve and fracture mechanics for fatigue life analysis of welded structures
Guoqian Wei, Ochbileg Odsuren, Xudong Yue, Zhang Dang1,2
1.1. School of Machinery and Automation, Wuhan University of Science and Technology, Wuhan 430081, China;2.
2. Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Abstract:
Based on the evolution of fatigue cracks in welded structures, the fatigue life of welded structures was defined as the sum of the crack initiation life Ni and the crack propagation life Np. Correspondingly, a fatigue-life analysis method combining S-N curves and fracture mechanics theory was proposed. The equivalent structural stress method and the lower 99% boundary of the master S-N curve were used to evaluate Ni, and cracks at the end of the initiation stage were considered as semi-elliptical surface cracks. Moreover, Paris equation and the stress intensity factor range of the cracks were used to evaluate Np. Furthermore, the fatigue test results obtained from the running girder of cranes were used as a reference for comparison and verification of the results. The results revealed that the equivalent structural stress is a good indicator for the crack initiation behavior of complex welded structures. In addition, the predicted fatigue life corresponded closely to the testing life.
Key words:  welded structures|fatigue life|equivalent structural stress|S-N curve|fracture mechanics