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| Analysis on growth rate of fatigue crack of welded structures based on multi-factor |
| Received:March 31, 2019 Revised:August 01, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20190331002 |
| KeyWord:welded structure fatigue crack growth rate shape factor effective stress ratio residual stress |
| Author | Institution |
| 白林越 |
中国人民解放军陆军工程大学 野战工程学院, 南京 |
| 邵飞 |
中国人民解放军陆军工程大学 野战工程学院, 南京 |
| 高磊 |
中国人民解放军陆军工程大学 野战工程学院, 南京 |
| 徐倩 |
中国人民解放军陆军工程大学 野战工程学院, 南京 |
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| Abstract: |
| Based on the calculation model of growth rate of a fatigue crack proposed by Donahue et al,a calculation model of growth rate of a fatigue crack applied to welded structures was established by inducing the parameters of shape factor,crack opening ratio,and residual stress.In addition,influences of various factors on the growth rate of fatigue crack of welded structures were analyzed.The results indicate that both plate thickness and excess weld metal have impacts on the growth rate of a fatigue crack of welded structures,and a certain height of excess weld metal should be retained while designing the surface shape of welded structures.Furthermore,the growth rate of a fatigue crack of welded structures decreases with increasing effective stress ratio,and such a phenomenon is independent of the crack depth.The increase of residual stress accelerates the growth rate of a fatigue crack of welded structures,and this rate will increase while crack depth grows.Thus,the impact of the residual stress must be considered while the fatigue performance of welded structures is designed. |
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