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Appl. Sci. 2018, 8(9), 1614; https://doi.org/10.3390/app8091614

Notch Effect on the Fatigue Behavior of a TC21 Titanium Alloy in Very High Cycle Regime

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
*
Author to whom correspondence should be addressed.
Received: 6 August 2018 / Revised: 21 August 2018 / Accepted: 9 September 2018 / Published: 11 September 2018
(This article belongs to the Section Materials)
Full-Text   |   PDF [7299 KB, uploaded 11 September 2018]   |  

Abstract

The very high cycle fatigue (VHCF) property of TC21 titanium alloy blunt-notched specimens were investigated by using an ultrasonic fatigue test machine with a frequency of 20 kHz. S–N of blunt-notched specimens illustrated a continuous decrease characteristic with a horizontal line over the 105–109 cycle regimes. However, the fatigue life showed a large scatter for blunt-notched specimens. Blunt-notch significantly reduced the fatigue property in the high cycle and very high cycle regimes compared with that of smooth specimens. The crack initiation modes for blunt-notched specimens in the very high cycle regime can be divided into three types: (i) surface initiation, (ii) subsurface with flat facet, and (iii) subsurface with “facet + fine granular area”. The crack initiation mechanism of blunt-notched specimens is discussed in view of the interaction of notch stress gradient distribution and heterogeneous microstructure. Furthermore, the fatigue limit model based on the theory of critical distance (TCD) was modified for the very high cycle regime, and the scatter of the fatigue property of the blunt-notched specimens were well predicted by using this model. View Full-Text
Keywords: very high cycle fatigue; notch effect; titanium alloy; fatigue limit very high cycle fatigue; notch effect; titanium alloy; fatigue limit
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Nie, B.; Chen, D.; Zhao, Z.; Zhang, J.; Meng, Y.; Gao, G. Notch Effect on the Fatigue Behavior of a TC21 Titanium Alloy in Very High Cycle Regime. Appl. Sci. 2018, 8, 1614.

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