Effects of intermittent loading time and stress ratio on dwell fatigue behavior of titanium alloy Ti-6Al-4V ELI used in deep-sea submersibles

doi:10.1016/j.jmst.2020.10.063

IMECH-IR > 非线性力学国家重点实验室

	Effects of intermittent loading time and stress ratio on dwell fatigue behavior of titanium alloy Ti-6Al-4V ELI used in deep-sea submersibles
	Sun CQ(孙成奇)1,2 ; Li, Yanqing 3; Xu, Kuilong 4; Xu, Baotong 5
通讯作者	Sun, Chengqi(scq@lnm.imech.ac.cn)
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2021-06-30
卷号	77 页码:223-236
ISSN	1005-0302
摘要	Different components of deep-sea submersibles, such as the pressure hull, are usually subjected to intermittent loading, dwell loading, and unloading during service. Therefore, for the design and reliability assessment of structural parts under dwell fatigue loading, understanding the effects of intermittent loading time on dwell fatigue behavior of the alloys is essential. In this study, the effects of the intermittent loading time and stress ratio on dwell fatigue behavior of the titanium alloy Ti-6Al-4V ELI were investigated. Results suggest that the dwell fatigue failure modes of Ti-6Al-4V ELI can be classified into three types, i.e., fatigue failure mode, ductile failure mode, and mixed failure mode. The intermittent loading time does not affect the dwell fatigue behavior, whereas the stress ratio significantly affects the dwell fatigue life and dwell fatigue mechanism. The dwell fatigue life increases with an increase in the stress ratio for the same maximum stress, and specimens with a negative stress ratio tend to undergo ductile failure. The mechanism of dwell fatigue of titanium alloys is attribute to an increase in the plastic strain caused by the part of the dwell loading, thereby resulting in an increase in the actual stress of the specimens during the subsequent loading cycles and aiding the growth of the formed crack or damage, along with the local plastic strain or damage induced by the part of the fatigue load promoting the cumulative plastic strain during the dwell fatigue process. The interaction between dwell loading and fatigue loading accelerates specimen failure, in contrast to the case for individual creep or fatigue loading alone. The dwell fatigue life and cumulative maximum strain during the first loading cycle could be correlated by a linear relationship on the log-log scale. This relationship can be used to evaluate the dwell fatigue life of Ti alloys with the maximum stress dwell. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Ti-6Al-4V ELI Dwell fatigue Intermittent loading time Stress ratio Creep fatigue interaction
DOI	10.1016/j.jmst.2020.10.063
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000671167000002
关键词[WOS]	HIGH-CYCLE FATIGUE ; SENSITIVE FATIGUE ; MICROSTRUCTURE ; FREQUENCY ; GROWTH ; CRACKS
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助项目	National Key Research and Development Program of China[2017YFC0305500]
项目资助者	National Key Research and Development Program of China
论文分区	一类
力学所作者排名	1
RpAuthor	Sun, Chengqi
引用统计	被引频次：35[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/311007/87029
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.China Ship Sci Res Ctr, State Key Lab Deep Sea Manned Vehicles, Wuxi 214082, Jiangsu, Peoples R China; 4.Luoyang Ship Mat Res Inst, Luoyang 471023, Peoples R China; 5.Beijing Inst Aeronaut Mat, Aero Engine Corp China, Beijing 100095, Peoples R China
推荐引用方式 GB/T 7714	Sun CQ,Li, Yanqing,Xu, Kuilong,et al. Effects of intermittent loading time and stress ratio on dwell fatigue behavior of titanium alloy Ti-6Al-4V ELI used in deep-sea submersibles[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,77:223-236.
APA	孙成奇,Li, Yanqing,Xu, Kuilong,&Xu, Baotong.(2021).Effects of intermittent loading time and stress ratio on dwell fatigue behavior of titanium alloy Ti-6Al-4V ELI used in deep-sea submersibles.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,77,223-236.
MLA	孙成奇,et al."Effects of intermittent loading time and stress ratio on dwell fatigue behavior of titanium alloy Ti-6Al-4V ELI used in deep-sea submersibles".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 77(2021):223-236.

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