| 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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| 会议录名称 | INTERNATIONAL JOURNAL OF FATIGUE
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| 2016
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| 会议名称 | 5th International Conference on Crack Paths (CP)
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| 会议日期 | SEP, 2015
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| 会议地点 | Ferrara, ITALY
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| 摘要 | 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. |
| 关键词 | 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
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| WOS记录号 | WOS:000383930300007
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| 课题组名称 | LNM金属材料微结构与力学性能
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| URL | 查看原文
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| 收录类别 | CPCI-S
; SCI
; EI
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| 语种 | 英语
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| 引用统计 |
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| 文献类型 | 会议论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/60178
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| 专题 | 非线性力学国家重点实验室
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| 通讯作者 | Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China. |
推荐引用方式
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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