Faceted crack initiation characteristics for high-cycle and very-high-cycle fatigue of a titanium alloy under different stress ratios
文献类型：会议论文
| 作者 | Liu XL(刘小龙); Sun CQ(孙成奇) ; Hong YS(洪友士)
|
| 出版日期 | 2016 |
| 会议名称 | 5th International Conference on Crack Paths (CP) |
| 会议日期 | SEP, 2015 |
| 会议地点 | Ferrara, ITALY |
| 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 |
| 通讯作者 | Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China. |
| 中文摘要 | 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. |
| 收录类别 | CPCI-S ; SCI ; EI |
| 会议网址 | 10.1016/j.ijfatigue.2016.03.013 |
| 会议录 | INTERNATIONAL JOURNAL OF FATIGUE
 |
| 语种 | 英语 |
| WOS记录号 | WOS:000383930300007 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/60178]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Liu XL,Sun CQ,Hong YS. Faceted crack initiation characteristics for high-cycle and very-high-cycle fatigue of a titanium alloy under different stress ratios[C]. 见:5th International Conference on Crack Paths (CP). Ferrara, ITALY. SEP, 2015.10.1016/j.ijfatigue.2016.03.013. |
入库方式： OAI收割
来源：力学研究所
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