IMECH-IR  > 非线性力学国家重点实验室
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
Conference Name5th International Conference on Crack Paths (CP)
Conference DateSEP, 2015
Conference PlaceFerrara, ITALY
AbstractUltrasonic 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 Competing Failure Modes Poisson Defect Statistics Ti-6al-4v Alloy Structural-materials Mean Stress Strength Microstructure Behavior Duality Surface
WOS IDWOS:000383930300007
DepartmentLNM金属材料微结构与力学性能
URL查看原文
Indexed ByCPCI-S ; SCI ; EI
Language英语
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60178
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[C],2016.
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