| 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)
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| 通讯作者 | Sun, Chengqi(scq@lnm.imech.ac.cn)
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| 发表期刊 | METALS
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| 2019-08-01
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| 卷号 | 9期号:8页码:7 |
| 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. |
| 关键词 | dwell fatigue
fatigue life
effect of rise and fall time
effect of specimen shape
high strength titanium alloy
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| DOI | 10.3390/met9080914
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| 收录类别 | SCI
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| 语种 | 英语
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| WOS记录号 | WOS:000484510000104
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| 关键词[WOS] | CRACK-GROWTH
; LOADING FREQUENCY
; MICROSTRUCTURE
; PROPAGATION
; STEEL
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| WOS研究方向 | Materials Science
; Metallurgy & Metallurgical Engineering
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| WOS类目 | Materials Science, Multidisciplinary
; Metallurgy & Metallurgical Engineering
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| 资助项目 | National Key Research and Development Program of China[2017YFC0305500]
; National Natural Science Foundation of China[91860112]
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| 项目资助者 | National Key Research and Development Program of China
; National Natural Science Foundation of China
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| 论文分区 | 二类/Q1
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| 力学所作者排名 | 1
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| RpAuthor | Sun, Chengqi
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/79997
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| 专题 | 非线性力学国家重点实验室
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推荐引用方式
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.
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| 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.
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| 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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