IMECH-IR  > 非线性力学国家重点实验室
Effect of Rise and Fall Time on Dwell Fatigue Behavior of a High Strength Titanium Alloy
Song QY(宋清源); Li, YQ; Wang, L; Huang, RX; Sun CQ(孙成奇)
Corresponding AuthorSun, Chengqi(scq@lnm.imech.ac.cn)
Source PublicationMETALS
2019-08-01
Volume9Issue:8Pages:7
AbstractFrequency 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.
Keyworddwell fatigue fatigue life effect of rise and fall time effect of specimen shape high strength titanium alloy
DOI10.3390/met9080914
Indexed BySCI
Language英语
WOS IDWOS:000484510000104
WOS KeywordCRACK-GROWTH ; LOADING FREQUENCY ; MICROSTRUCTURE ; PROPAGATION ; STEEL
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding ProjectNational Key Research and Development Program of China[2017YFC0305500] ; National Natural Science Foundation of China[91860112]
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China
Classification二类/Q1
Ranking1
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/79998
Collection非线性力学国家重点实验室
Recommended Citation
GB/T 7714
Song QY,Li, YQ,Wang, L,et al. Effect of Rise and Fall Time on Dwell Fatigue Behavior of a High Strength Titanium Alloy[J]. METALS,2019,9(8):7.
APA 宋清源,Li, YQ,Wang, L,Huang, RX,&孙成奇.(2019).Effect of Rise and Fall Time on Dwell Fatigue Behavior of a High Strength Titanium Alloy.METALS,9(8),7.
MLA 宋清源,et al."Effect of Rise and Fall Time on Dwell Fatigue Behavior of a High Strength Titanium Alloy".METALS 9.8(2019):7.
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