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

CORC > 力学研究所 > 中国科学院力学研究所 > 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)4,5; Li, Yanqing 3; Xu, Kuilong 2; Xu, Baotong 1
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2021-06-30
卷号	77 页码:223-236
关键词	Ti-6Al-4V ELI Dwell fatigue Intermittent loading time Stress ratio Creep fatigue interaction
ISSN号	1005-0302
DOI	10.1016/j.jmst.2020.10.063
通讯作者	Sun, Chengqi(scq@lnm.imech.ac.cn)
英文摘要	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.
分类号	一类
资助项目	National Key Research and Development Program of China[2017YFC0305500]
WOS关键词	HIGH-CYCLE FATIGUE ; SENSITIVE FATIGUE ; MICROSTRUCTURE ; FREQUENCY ; GROWTH ; CRACKS
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000671167000002
资助机构	National Key Research and Development Program of China
其他责任者	Sun, Chengqi
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/87028]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Beijing Inst Aeronaut Mat, Aero Engine Corp China, Beijing 100095, Peoples R China 2.Luoyang Ship Mat Res Inst, Luoyang 471023, Peoples R China; 3.China Ship Sci Res Ctr, State Key Lab Deep Sea Manned Vehicles, Wuxi 214082, Jiangsu, Peoples R China; 4.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 5.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 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.