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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

Vol. 17 (2022), No. 3, 207–228
Abstract

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 ΔCTOD 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
Milestones
Received: 6 July 2021
Revised: 28 January 2022
Accepted: 1 February 2022
Published: 22 January 2023
Authors
Junlin Deng
School of Mechanical and Marine Engineering
Beibu Gulf University
Qinzhou, Guangxi
China
Wenling Tu
School of Mechanical and Marine Engineering
Beibu Gulf University
Qinzhou, Guangxi
China
Qin Dong
School of Transportation
Wuhan University of Technology
Wuhan
China
Dawei Dong
School of Mechanical and Marine Engineering
Beibu Gulf University
Qinzhou, Guangxi
China
Shenglin Qiu
School of Mechanical and Marine Engineering
Beibu Gulf University
Qinzhou, Guangxi
China