Effect of Rise and Fall Time on Dwell Fatigue Behavior of a High Strength Titanium Alloy

被引:15
|
作者
Song, Qingyuan [1 ,2 ]
Li, Yanqing [3 ]
Wang, Lei [3 ]
Huang, Ruxu [3 ]
Sun, Chengqi [1 ,2 ]
机构
[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
基金
中国国家自然科学基金;
关键词
dwell fatigue; fatigue life; effect of rise and fall time; effect of specimen shape; high strength titanium alloy; CRACK-GROWTH; LOADING FREQUENCY; MICROSTRUCTURE; PROPAGATION; STEEL;
D O I
10.3390/met9080914
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Frequency is an important factor influencing the fatigue behavior. Regarding to the dwell fatigue, it corresponds to the effect of rise and fall time, which is also an important issue especially for the safety evaluation of structure parts under dwell fatigue loading, such as the engines of aircrafts and the pressure hulls of deep-sea submersibles. In this paper, the effect of rise and fall time (2 s, 20 s, 110 s, and 200 s) on the dwell fatigue behavior is investigated for a high strength titanium alloy Ti-6Al-2Sn-2Zr-3Mo-X with basket-weave microstructure. It is shown that the dwell fatigue life decreases with increasing the rise and fall time, which could be correlated by a linear relation in log-log scale for both the specimen with circular cross section and the specimen with square cross section. The rise and fall time has no influence on the crack initiation mechanism by the scanning electron microscope observation. The cracks initiate from the specimen surface and all the fracture surfaces present multiple crack initiation sites. Moreover, the facet characteristic is observed at some crack initiation sites for both the conventional fatigue and dwell fatigue tests. The paper also indicates that the dwell period of the peak stress reduces the fatigue life and the dwell fatigue life seems to be longer for the specimen with circular cross section than that of the specimen with square cross section.
引用
收藏
页数:7
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