Crack Initiation Mechanism and Life Prediction of Ti60 Titanium Alloy Considering Stress Ratios Effect in Very High Cycle Fatigue Regime

Ruixiang He; Haotian Peng; Fulin Liu; Muhammad Kashif Khan; Yao Chen; Chao He; Chong Wang; Qingyuan Wang; Yongjie Liu

doi:10.3390/ma15082800

Crack Initiation Mechanism and Life Prediction of Ti60 Titanium Alloy Considering Stress Ratios Effect in Very High Cycle Fatigue Regime

Ruixiang He, Haotian Peng, Fulin Liu, Muhammad Kashif Khan, Yao Chen, Chao He, Chong Wang, Qingyuan Wang, Yongjie Liu

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Abstract

Ultrasonic fatigue tests were performed on Ti60 titanium alloy up to a very high cycle fatigue (VHCF) regime at various stress ratios to investigate the characteristics. The S-N curves showed continuous declining trends with fatigue limits of 400, 144 and 130 MPa at 10 cycles corresponding to stress ratios of R = -1, 0.1 and 0.3, respectively. Fatigue cracks found to be initiated from the subsurface of the specimens in the VHCF regime, especially at high stress ratios. Two modified fatigue life prediction models based on fatigue crack initiation mechanisms for Ti60 titanium alloy in the VHCF regime were developed which showed good agreement with the experimental data.

Original language	English
Article number	2800
Number of pages	15
Journal	Materials
Volume	15
Issue number	8
DOIs	https://doi.org/10.3390/ma15082800
Publication status	Published - 11 Apr 2022

Bibliographical note

Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).

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Funding: This work was supported by the National Natural Science Research Funds of China (No. 12172238, No. 11832007, No.12022208, and No. 12072212).

Keywords

Ti60 titanium alloy
fatigue failure mechanism
fatigue life prediction
fatigue strength prediction
stress ratio
very high cycle fatigue

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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Crack Initiation Mechanism and Life Prediction of Ti60 Titanium Alloy Considering Stress Ratios Effect in Very High Cycle Fatigue Regime. / He, Ruixiang; Peng, Haotian; Liu, Fulin; Khan, Muhammad Kashif; Chen, Yao; He, Chao; Wang, Chong; Wang, Qingyuan; Liu, Yongjie.

In: Materials, Vol. 15, No. 8, 2800, 11.04.2022.

Research output: Contribution to journal › Article › peer-review

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abstract = "Ultrasonic fatigue tests were performed on Ti60 titanium alloy up to a very high cycle fatigue (VHCF) regime at various stress ratios to investigate the characteristics. The S-N curves showed continuous declining trends with fatigue limits of 400, 144 and 130 MPa at 10 cycles corresponding to stress ratios of R = -1, 0.1 and 0.3, respectively. Fatigue cracks found to be initiated from the subsurface of the specimens in the VHCF regime, especially at high stress ratios. Two modified fatigue life prediction models based on fatigue crack initiation mechanisms for Ti60 titanium alloy in the VHCF regime were developed which showed good agreement with the experimental data.",

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AU - Chen, Yao

AU - He, Chao

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AU - Wang, Qingyuan

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Crack Initiation Mechanism and Life Prediction of Ti60 Titanium Alloy Considering Stress Ratios Effect in Very High Cycle Fatigue Regime

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