Effects of Notches and Defects on Dwell Fatigue Mechanism and Fatigue Life of Ti-6Al-4V ELI Alloy Used in Deep-Sea Submersibles
文献类型：期刊论文
| 作者 | Sun J(孙健)2,3; Wu, Lei1; Sun CQ(孙成奇)2,3
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| 刊名 | JOURNAL OF MARINE SCIENCE AND ENGINEERING
 |
| 出版日期 | 2021-08-01 |
| 卷号 | 9期号:8页码:14 |
| 关键词 | titanium alloy Ti-6Al-4V ELI notch defect dwell fatigue life failure mechanism |
| DOI | 10.3390/jmse9080845 |
| 通讯作者 | Wu, Lei(wulei@gbtcgroup.com) ; Sun, Chengqi(scq@lnm.imech.ac.cn) |
| 英文摘要 | The notch (i.e., stress concentration) and defect are important factors influencing the conventional fatigue behavior of metallic materials. What is the influence of notches and defects on the dwell fatigue mechanism and fatigue life? In this paper, the effects of notches and defects on the dwell fatigue behavior of the Ti-6Al-4V ELI alloy used in deep-sea submersibles are investigated under the load control mode. It is shown that the dwell fatigue is insensitive to the defect size (190-438 mu m) compared to the conventional fatigue. For notched specimens, they all present fatigue failure mode under dwell fatigue testing, and the dwell fatigue life is higher than that of the smooth specimen at the same local maximum stress. The dwell of the maximum stress has no influence on the fatigue life and failure mechanism for notched specimens. Moreover, the facet feature is observed in the crack initiation region for both the conventional and dwell fatigue of notched specimens. Electron backscatter diffraction observation indicates that the feature of the fine line markings on the facet in the image by scanning electron microscope is due to the steps on the fracture surface of the alpha grain. |
| 分类号 | 二类 |
| WOS关键词 | HIGH-CYCLE FATIGUE ; CRACK INITIATION ; STRESS RATIO ; RAILWAY AXLES ; TITANIUM ; BEHAVIOR ; MICROSTRUCTURE ; STRENGTH ; STEEL ; TIME |
| 资助项目 | National Natural Science Foundation of China Basic Science Center for Multiscale Problems in Nonlinear Mechanics[11988102] ; National Key Research and Development Program of China[2017YFC0305500] |
| WOS研究方向 | Engineering ; Oceanography |
| 语种 | 英语 |
| WOS记录号 | WOS:000689411600001 |
| 资助机构 | National Natural Science Foundation of China Basic Science Center for Multiscale Problems in Nonlinear Mechanics ; National Key Research and Development Program of China |
| 其他责任者 | Wu, Lei ; Sun, Chengqi |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/87396]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Guobiao Beijing Testing & Certificat Co Ltd, Beijing 101400, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, 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 | Sun J,Wu, Lei,Sun CQ. Effects of Notches and Defects on Dwell Fatigue Mechanism and Fatigue Life of Ti-6Al-4V ELI Alloy Used in Deep-Sea Submersibles[J]. JOURNAL OF MARINE SCIENCE AND ENGINEERING,2021,9(8):14. |
| APA | 孙健,Wu, Lei,&孙成奇.(2021).Effects of Notches and Defects on Dwell Fatigue Mechanism and Fatigue Life of Ti-6Al-4V ELI Alloy Used in Deep-Sea Submersibles.JOURNAL OF MARINE SCIENCE AND ENGINEERING,9(8),14. |
| MLA | 孙健,et al."Effects of Notches and Defects on Dwell Fatigue Mechanism and Fatigue Life of Ti-6Al-4V ELI Alloy Used in Deep-Sea Submersibles".JOURNAL OF MARINE SCIENCE AND ENGINEERING 9.8(2021):14. |
入库方式： OAI收割
来源：力学研究所
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