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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.
Source PublicationINTERNATIONAL JOURNAL OF FATIGUE
2016
Volume92Issue:2Pages:434-441
ISSN0142-1123
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.

KeywordTi-6al-4v Alloy Faceted Crack Initiation Very-high-cycle Fatigue Stress Ratio Cluster Of Primary Alpha Grains
DOI10.1016/j.ijfatigue.2016.03.013
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000383930300007
WOS KeywordTi-6Al-4V alloy ; Faceted crack initiation ; Very-high-cycle fatigue ; Stress ratio ; Cluster of primary alpha grains
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary
Funding OrganizationThe 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.
DepartmentLNM金属材料微结构与力学性能
Classification一类
RankingTrue
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59720
Collection非线性力学国家重点实验室
Corresponding AuthorHong, 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[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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