{"title":"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","authors":"Yuxiang Zhao, Peishi Yu, Lei Yao, Yin Tao, Xin Zhang, Junhua Zhao","doi":"10.1016/j.engfracmech.2025.111572","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111572"},"PeriodicalIF":5.3000,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Revealing microstructural crack deflection for EH36 steel and predicting fatigue growth of part-through curve cracks\",\"authors\":\"Yuxiang Zhao, Peishi Yu, Lei Yao, Yin Tao, Xin Zhang, Junhua Zhao\",\"doi\":\"10.1016/j.engfracmech.2025.111572\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>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.</div></div>\",\"PeriodicalId\":11576,\"journal\":{\"name\":\"Engineering Fracture Mechanics\",\"volume\":\"328 \",\"pages\":\"Article 111572\"},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2025-09-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Engineering Fracture Mechanics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0013794425007738\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MECHANICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Engineering Fracture Mechanics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0013794425007738","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}
Revealing microstructural crack deflection for EH36 steel and predicting fatigue growth of part-through curve cracks
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.
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.