Effects of Notches and Defects on Dwell Fatigue Mechanism and Fatigue Life of Ti-6Al-4V ELI Alloy Used in Deep-Sea Submersibles

doi:10.3390/jmse9080845

IMECH-IR > 非线性力学国家重点实验室

	Effects of Notches and Defects on Dwell Fatigue Mechanism and Fatigue Life of Ti-6Al-4V ELI Alloy Used in Deep-Sea Submersibles
	Sun J(孙健)1,2; Wu, Lei 3; Sun CQ(孙成奇)1,2
通讯作者	Wu, Lei(wulei@gbtcgroup.com) ; Sun, Chengqi(scq@lnm.imech.ac.cn)
发表期刊	JOURNAL OF MARINE SCIENCE AND ENGINEERING
	2021-08-01
卷号	9 期号:8 页码:14
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.
关键词	titanium alloy Ti-6Al-4V ELI notch defect dwell fatigue life failure mechanism
DOI	10.3390/jmse9080845
收录类别	SCI
语种	英语
WOS记录号	WOS:000689411600001
关键词[WOS]	HIGH-CYCLE FATIGUE ; CRACK INITIATION ; STRESS RATIO ; RAILWAY AXLES ; TITANIUM ; BEHAVIOR ; MICROSTRUCTURE ; STRENGTH ; STEEL ; TIME
WOS研究方向	Engineering ; Oceanography
WOS类目	Engineering, Marine ; Engineering, Ocean ; Oceanography
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]
项目资助者	National Natural Science Foundation of China Basic Science Center for Multiscale Problems in Nonlinear Mechanics ; National Key Research and Development Program of China
论文分区	二类
力学所作者排名	1
RpAuthor	Wu, Lei ; Sun, Chengqi
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/87397
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.Guobiao Beijing Testing & Certificat Co Ltd, Beijing 101400, 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.

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