Fatigue crack propagation behavior of high-strength steel under variable amplitude loading
Fatigue crack propagation behavior of high-strength steel under variable amplitude loading
复制标题
变幅载荷下高强钢疲劳裂纹扩展行为
DOI：
10.1016/j.engfracmech.2021.107642
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发表时间：
2021-03
影响因子：
5.4
通讯作者：
Tang Weiguo
中科院分区：
文献类型：
--
作者：
Tu Wenjie;Yue Jingxia;Xie Hao;Tang Weiguo
本文针对海洋结构用高强度钢，设计并进行了一系列裂纹扩展试验，研究了不同加载形式对裂纹扩展的影响。首先，设计了一系列AH36高强度钢紧凑拉伸试件的疲劳裂纹扩展试验，研究了过载比、过载间隔和加载顺序对疲劳裂纹扩展速率的影响。此外，采用风暴模型载荷和叠加载荷进一步研究了更复杂载荷条件下的裂纹扩展行为。研究表明，变幅载荷下的疲劳裂纹扩展行为有明显的偏差。这种差异主要是由变幅加载的顺序和拉伸/压缩过载时的延迟/加速引起的。此外，采用数字图像相关技术获得了裂纹尖端的应变场和残余应变。通过分析裂纹尖端应变场的变化，研究了变幅载荷下疲劳裂纹扩展行为的机理。提出了计算裂纹尖端塑性区尺寸的扩展有限元方法，并验证了该方法的准确性和适用性。最后，将精度较高的数字图像相关技术得到的塑性区尺寸应用于改进的Wheeler模型，并用改进的Wheeler模型预测了变幅载荷下的疲劳裂纹扩展行为，与实验结果吻合较好。
In this paper, aimed at high strength steel for marine structures, a series of crack propagation tests were designed and carried out, and the influence of different load forms on crack growth has been investigated. At first, a series of fatigue crack propagation experiments were designed for compact tension specimens made of AH36 High-strength steel, and the influences of overload ratio, interval of overloads, and load sequence on fatigue crack growth rate were investigated. Besides, storm model loading and superimposed loading were applied to further investigate crack growth behavior under more complex loading condition. The research indicates fatigue crack growth behavior under variable amplitude loadings deviates apparently. The difference is mainly caused by the sequence of variable amplitude loadings and the retardation/acceleration when tensile/compressive overloads are applied. Moreover, digital image correlation technique was adopted to obtain the strain fields and residual strain around crack tip. The mechanism of fatigue crack growth behavior under variable amplitude loadings was investigated by analyzing the transformation of strain fields in crack tips. Extended finite element method to calculate the plastic zone size around crack tip was proposed and verified to be accurate and applicable. In the end, the plastic zone size obtained by digital image correlation technique, which shows better accuracy, was applied to improve the modified Wheeler model, and the fatigue crack growth behavior under variable amplitude loadings was predicted by the improved modified Wheeler model, and was in good agreement with experiment results.
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DOI：
--
发表时间：
1957
期刊：
--
影响因子：
--
作者：
G. Irwin
通讯作者：
G. Irwin
影响因子：
3.9
作者：
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通讯作者：
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影响因子：
3.9
作者：
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I. Lotsberg;Einar Landet
影响因子：
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作者：
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通讯作者：
N. Yildirim;Ö. Vardar
影响因子：
6
作者：
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通讯作者：
Myung-Hyun Kim;Sung-Won Kang;Jeong Hwan Kim;K. Kim;Joong-Kyoo Kang;J. Heo