| Faceted crack initiation characteristics for high-cycle and very-high-cycle fatigue of a titanium alloy under different stress ratios | |
Liu XL(刘小龙); Sun CQ(孙成奇) ; Hong YS(洪友士); Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
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| Source Publication | INTERNATIONAL JOURNAL OF FATIGUE |
| 2016 | |
| Conference Name | 5th International Conference on Crack Paths (CP) |
| Conference Date | SEP, 2015 |
| Conference Place | Ferrara, ITALY |
| Abstract | Ultrasonic fatigue tests were conducted at the stress ratios of -1, -0.5, -0.1, 0.1 and 0.5 for a Ti-6Al-4V alloy in high-cycle and very-high-cycle fatigue regimes. Experimental results showed that faceted crack initiation was the main failure mode for specimens at the stress ratios of 0.1, 0.1 and 0.5, and multi-site faceted crack initiation was observed at the stress ratios of 0.1 and 0.5. The measurements indicated that the number of facets increased with the increase of stress ratio. Based on the observations, the mechanism of faceted crack initiation was proposed, i.e., (i) cleavage of isolated primary alpha grains in cluster; (ii) gradual growth of originated cracks (facets), and the coalescence of adjacent facets; and (iii) coalesced facets forming a main crack in the cluster. Moreover, a model based on Poisson defect distribution is proposed to describe the effects of stress ratio on faceted crack initiation, which is in agreement with the experimental results. (C) 2016 Elsevier Ltd. All rights reserved. |
| Keyword | Ti-6al-4v Alloy Faceted Crack Initiation Very-high-cycle Fatigue Stress Ratio Cluster Of Primary Alpha Grains Competing Failure Modes Poisson Defect Statistics Ti-6al-4v Alloy Structural-materials Mean Stress Strength Microstructure Behavior Duality Surface |
| WOS ID | WOS:000383930300007 |
| Department | LNM金属材料微结构与力学性能 |
| URL | 查看原文 |
| Indexed By | CPCI-S ; SCI ; EI |
| Language | 英语 |
| Citation statistics | |
| Document Type | 会议论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/60178 |
| Collection | 非线性力学国家重点实验室 |
| Corresponding Author | Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China. |
| Recommended Citation GB/T 7714 | Liu XL,Sun CQ,Hong YS,et al. Faceted crack initiation characteristics for high-cycle and very-high-cycle fatigue of a titanium alloy under different stress ratios[C]INTERNATIONAL JOURNAL OF FATIGUE,2016. |
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| File Name/Size | DocType | Version | Access | License | ||
| Cp2016-002.pdf（2579KB） | 会议论文 | 开放获取 | CC BY-NC-SA | View Download | ||
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