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Open AccessArticle

Effect of Low Cycle Fatigue Predamage on Very High Cycle Fatigue Behavior of TC21 Titanium Alloy

1
School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China
2
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
3
School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, China
*
Author to whom correspondence should be addressed.
Materials 2017, 10(12), 1384; https://doi.org/10.3390/ma10121384
Received: 28 October 2017 / Revised: 24 November 2017 / Accepted: 29 November 2017 / Published: 4 December 2017
The effect of low cycle fatigue (LCF) predamage on the subsequent very high cycle fatigue (VHCF) behavior is investigated in TC21 titanium alloy. LCF predamage is applied under 1.8% strain amplitude up to various fractions of the expected life and subsequent VHCF properties are determined using ultrasonic fatigue tests. Results show that 5% of predamage insignificantly affects the VHCF limit due to the absence of precrack, but decreases the subsequent fatigue crack initiation life estimated by the Pairs law. Precracks introduced by 10% and 20% of predamage significantly reduce the subsequent VHCF limits. The crack initiation site shifts from subsurface-induced fracture for undamaged and 5% predamaged specimens to surface precrack for 10% and 20% predamaged specimens in very high cycle region. Furthermore, the predicted fatigue limits based on the El Haddad modified model for the predamaged specimens agree with the experimental results. View Full-Text
Keywords: very high cycle fatigue; fatigue predamage; titanium alloy; LCF very high cycle fatigue; fatigue predamage; titanium alloy; LCF
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MDPI and ACS Style

Nie, B.; Zhao, Z.; Ouyang, Y.; Chen, D.; Chen, H.; Sun, H.; Liu, S. Effect of Low Cycle Fatigue Predamage on Very High Cycle Fatigue Behavior of TC21 Titanium Alloy. Materials 2017, 10, 1384.

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