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Experimental study
on biaxial proportional low-cycle fatigue crack propagation
of hull inclined-crack plate based on CTOD
Junlin Deng, Wenling Tu, Qin Dong, Dawei Dong and Shenglin Qiu |
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Vol. 17 (2022), No. 3, 207–228
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Abstract |
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Fracture failures of ship plates subjected to in-plane biaxial low-cycle fatigue loading are generally the coupling result of accumulative plasticity and biaxial low-cycle fatigue damage. A biaxial low-cycle fatigue crack growth analysis of a hull structure that accounts for the accumulative plasticity effect can be more suitable for the actual evaluation of the overall fracture performance of the hull structure in severe sea conditions. An analytical model of biaxial low-cycle fatigue crack propagation with a control parameter for CTOD is presented for a hull inclined-crack plate. A test was conducted for cruciform specimens made of Q235 steel with an inclined crack to validate the presented analysis. The biaxial accumulative plasticity behavior and the effects of biaxiality and stress ratios were investigated. The results of this study reveal a strong dependence of biaxial low-cycle fatigue crack propagation on biaxial accumulated plasticity. |
Keywords
hull cracked plate, biaxial low-cycle fatigue, accumulative
plasticity, CTOD
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Milestones
Received: 6 July 2021
Revised: 28 January 2022
Accepted: 1 February 2022
Published: 22 January 2023
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Authors |
| Junlin Deng | |
| School of Mechanical and Marine
Engineering Beibu Gulf University Qinzhou, Guangxi China |
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| Wenling Tu | |
| School of Mechanical and Marine
Engineering Beibu Gulf University Qinzhou, Guangxi China |
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| Qin Dong | |
| School of Transportation Wuhan University of Technology Wuhan China |
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| Dawei Dong | |
| School of Mechanical and Marine
Engineering Beibu Gulf University Qinzhou, Guangxi China |
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| Shenglin Qiu | |
| School of Mechanical and Marine
Engineering Beibu Gulf University Qinzhou, Guangxi China |
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