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. | |
发表期刊 | INTERNATIONAL JOURNAL OF FATIGUE |
2016 | |
卷号 | 92期号:2页码:434-441 |
ISSN | 0142-1123 |
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 |
DOI | 10.1016/j.ijfatigue.2016.03.013 |
URL | 查看原文 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:000383930300007 |
关键词[WOS] | Ti-6Al-4V alloy ; Faceted crack initiation ; Very-high-cycle fatigue ; Stress ratio ; Cluster of primary alpha grains |
WOS研究方向 | Engineering ; Materials Science |
WOS类目 | Engineering, Mechanical ; Materials Science, Multidisciplinary |
项目资助者 | The financial supports by the National Basic esearch Program of China (2012CB937500) and by the National Natural Science Foundation of China (11572325 and 11202210) are gratefully appreciated. |
课题组名称 | LNM金属材料微结构与力学性能 |
论文分区 | 一类 |
力学所作者排名 | True |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/59720 |
专题 | 非线性力学国家重点实验室 |
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[J]. INTERNATIONAL JOURNAL OF FATIGUE,2016,92,2,:434-441. |
APA | Liu XL,Sun CQ,Hong YS,&Hong, YS .(2016).Faceted crack initiation characteristics for high-cycle and very-high-cycle fatigue of a titanium alloy under different stress ratios.INTERNATIONAL JOURNAL OF FATIGUE,92(2),434-441. |
MLA | Liu XL,et al."Faceted crack initiation characteristics for high-cycle and very-high-cycle fatigue of a titanium alloy under different stress ratios".INTERNATIONAL JOURNAL OF FATIGUE 92.2(2016):434-441. |
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