用于船舶结构的 EH36 钢加劲板低循环疲劳裂纹生长率的实验研究

IF 2.7 3区地球科学 Q1 ENGINEERING, MARINE

Journal of Marine Science and Engineering Pub Date : 2024-08-11 DOI:10.3390/jmse12081365

Qin Dong, Geng Xu, Wei Chen

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引用次数: 0

摘要

本文介绍了一种确定包含裂纹的加劲板结构中低循环疲劳（LCF）裂纹扩展速率的直接方法。该方法同时依赖于裂纹尖端张开位移（CTOD）和累积塑性应变，为船舶结构设计和评估低循环疲劳强度提供了有价值的见解。同时，在不同加载条件下，对存在单侧裂纹和中心裂纹的加劲板进行了 EH36 钢 LCF 裂纹生长试验。研究了应力振幅、应力比和加强筋位置对裂纹生长行为的影响。通过对试验数据进行拟合和验证分析，研究了 LCF 条件下 CTOD 与 EH36 钢裂纹生长率之间的关系。结果表明，所提出的基于 CTOD 的预测方法可以准确表征用于船舶结构的 EH36 钢加劲板的 LCF 裂纹生长行为。

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Experimental Research on the Low-Cycle Fatigue Crack Growth Rate for a Stiffened Plate of EH36 Steel for Use in Ship Structures

This paper presents a straightforward approach for determining the low-cycle fatigue (LCF) crack propagation rate in stiffened plate structures containing cracks. The method relies on both the crack tip opening displacement (CTOD) and the accumulative plastic strain, offering valuable insights for ship structure design and assessing LCF strength. Meanwhile, the LCF crack growth tests for the EH36 steel were conducted on stiffened plates with single-side cracks and central cracks under different loading conditions. The effects of stress amplitude, stress ratio, and stiffener position on the crack growth behavior were examined. Fitting and verifying analyses of the test data were employed to investigate the relationship between CTOD and the crack growth rate of EH36 steel under LCF conditions. The results showed that the proposed CTOD-based prediction method can accurately characterize the LCF crack growth behavior for stiffened plate of EH36 steel for use in ship structures.

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来源期刊

Journal of Marine Science and Engineering Engineering-Ocean Engineering

CiteScore

4.40

自引率

20.70%

发文量

1640

审稿时长

18.09 days

期刊介绍： Journal of Marine Science and Engineering (JMSE; ISSN 2077-1312) is an international, peer-reviewed open access journal which provides an advanced forum for studies related to marine science and engineering. It publishes reviews, research papers and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation or experimental procedure, if unable to be published in a normal way, can be deposited as supplementary electronic material.