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

查看全文 作　　者：Chengqi [1,2]Sun;Yanqing [3]Li;Kuilong [4]Xu;Baotong [5]Xu 高影响力作者 机构地区：[1]State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing,100190,China;[2]School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;[3]State Key Laboratory of Deep-sea Manned Vehicles(China Ship Scientific Research Center),Wuxi 214082,China;[4]LuoyangShip Material Research Institute,Luoyang,471023,China;[5]Aero Engine Corporation of China Beijing Institute of Aeronautical Materials,Beijing 100095,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2021年第18期,共14页高影响力期刊 基　　金：the National Key Research and Development Program of China(No.2017YFC0305500)。 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-6 Al-4 V ELI were investigated.Results suggest that the dwell fatigue failure modes of Ti-6 Al-4 V 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. 关 键 词：Ti-6Al-4V ELI Dwell fatigue Intermittent loading time Stress ratio Creep fatigue interaction
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