Revealing microstructural crack deflection for EH36 steel and predicting fatigue growth of part-through curve cracks

IF 5.3 2区 工程技术 Q1 MECHANICS
Yuxiang Zhao, Peishi Yu, Lei Yao, Yin Tao, Xin Zhang, Junhua Zhao
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引用次数: 0

Abstract

EH36 steel is widely used in marine structures, where accurate fatigue life prediction is essential. In this study, fatigue crack growth behavior was investigated through experiments and simulations on straight-through cracks with varying thicknesses and stress ratios. A three-dimensional crack growth model was developed, yielding fatigue parameters independent of geometry and loading, and showing strong agreement with experimental results. During validation, near-surface crack deflection was consistently observed in straight cracks. Further microstructural analysis using white light interferometry, SEM, and metallography revealed that grain orientation and inclusions drive the deviation of the crack path by altering local stress intensity and crack tip shape. To evaluate the model’s transferability, fatigue tests and simulations on part-through curved cracks were performed. The model accurately predicted both crack growth rates and paths. This work establishes a unified predictive framework for fatigue crack growth in EH36 steel, supported by microstructural understanding and applicable to complex crack geometries in marine engineering.

Abstract Image

揭示EH36钢微结构裂纹挠度并预测部分贯通曲线裂纹的疲劳扩展
EH36钢广泛应用于船舶结构中,准确的疲劳寿命预测是至关重要的。通过实验和模拟研究了不同厚度和应力比的直通式裂纹的疲劳裂纹扩展行为。建立了不受几何形状和载荷影响的三维裂纹扩展模型,该模型的疲劳参数与实验结果吻合较好。在验证过程中,在直裂纹中一致观察到近表面裂纹挠曲。利用白光干涉、扫描电镜和金相分析进一步发现,晶粒取向和夹杂物通过改变局部应力强度和裂纹尖端形状来驱动裂纹路径的偏离。为了评估模型的可移植性,进行了部分贯通弯曲裂纹的疲劳试验和模拟。该模型准确地预测了裂纹扩展速率和路径。该工作建立了EH36钢疲劳裂纹扩展的统一预测框架,以微观结构理解为支撑,适用于海洋工程中复杂的裂纹几何形状。
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来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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