Unified SIF at different stress ratios and the physical insight on the exponent of the Paris law
文献类型：期刊论文
| 作者 | Yuan, Lichao2,3 ; Wei, Yujie1,2,3; Wei YJ(魏宇杰)
|
| 刊名 | INTERNATIONAL JOURNAL OF FATIGUE
 |
| 出版日期 | 2024-07-01 |
| 卷号 | 184页码:12 |
| 关键词 | Fatigue crack growth Stress ratio effect Paris law Frank -Read sources Dislocation dynamics |
| ISSN号 | 0142-1123 |
| DOI | 10.1016/j.ijfatigue.2024.108314 |
| 通讯作者 | Wei, Yujie(yujie_wei@lnm.imech.ac.cn) |
| 英文摘要 | The Paris law has been broadly employed to describe fatigue crack growth (FCG) at steady state. It establishes the relationship between FCG rate and stress intensity factor (SIF) range. However, its physical insight remains an issue of controversy. The study aims to employ dislocation dynamics to explore two aspects associated with the Paris law: how does the stress-ratio affect the application of the Paris law? What is the microcosmic mechanism behind the Paris exponent in Paris law? We limit our exploration on the scenarios that dislocation nucleation and dislocation glide dominate FCG in an ideally isotropic single crystallite. Our exploration revealed that (1) a unified SIF range without empirical parameters could be adopted to account for the stress ratio effect, and this observation is in line with existing experiments, and (2) SIF affects FCG by influencing the nucleation of dislocation sources and activity of dislocations before crack tips. The stress-dependent dislocation nucleation time is correlated with the exponent of the Paris law. |
| WOS关键词 | FATIGUE-CRACK-GROWTH ; DISCRETE DISLOCATION PLASTICITY ; DRIVING-FORCE PARAMETER ; INTENSITY FACTOR ; R-RATIO ; THRESHOLD ; PROPAGATION ; MECHANISMS ; BEHAVIOR ; DEPENDENCE |
| 资助项目 | National Natural Sci- ence Foundation of China (NSFC) Basic Science Center for 'Multiscale Problems in Nonlinear Mechanics ', China[11988102] |
| WOS研究方向 | Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001224698100001 |
| 资助机构 | National Natural Sci- ence Foundation of China (NSFC) Basic Science Center for 'Multiscale Problems in Nonlinear Mechanics ', China |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/95420]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 通讯作者 | Wei, Yujie |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Univ Chinese Acad Sci, Sch Future Technol, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yuan, Lichao,Wei, Yujie,Wei YJ. Unified SIF at different stress ratios and the physical insight on the exponent of the Paris law[J]. INTERNATIONAL JOURNAL OF FATIGUE,2024,184:12. |
| APA | Yuan, Lichao,Wei, Yujie,&魏宇杰.(2024).Unified SIF at different stress ratios and the physical insight on the exponent of the Paris law.INTERNATIONAL JOURNAL OF FATIGUE,184,12. |
| MLA | Yuan, Lichao,et al."Unified SIF at different stress ratios and the physical insight on the exponent of the Paris law".INTERNATIONAL JOURNAL OF FATIGUE 184(2024):12. |
入库方式： OAI收割
来源：力学研究所
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