Combine S-N curve and fracture mechanics for fatigue life analysis of welded structures

被引：6

作者：

魏国前 ^{[1
,2
]}

Odsuren Ochbileg ^{[1
,2
]}

岳旭东 ^{[1
,2
]}

党章 ^{[1
,2
]}

机构：

[1] School of Machinery and Automation, Wuhan University of Science and Technology

[2] Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering,Wuhan University of Science and Technology

来源：

China Welding | 2019年 / 28卷 / 04期

关键词：

welded structures; fatigue life; equivalent structural stress; S-N curve; fracture mechanics;

D O I：

暂无

中图分类号：

TG441.7 [焊接缺陷及质量检查];

学科分类号：

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.

引用

页码：39 / 45

页数：7

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