Effect of surface roughness on the fatigue failure and evaluation of TC17 titanium alloy

Abstract

This paper is focused on the investigation of fatigue failure mechanism for TC17 with surface roughness, which is the quantitative expression of surface micro-scratch. First, the designed fatigue tests for TC17 with different surface conditions are carried out to investigate the mechanism of fatigue failure behavior for TC17 with surface roughness. A modified formula is developed to evaluate the fatigue limit of TC17. Then, with the comprehensive application of S–N curve models and test results, the new finding of model parameters is adopted, leading to a fatigue life model of TC17 with surface roughness. Study of fatigue evaluation model of TC17 with surface roughness is significant in theoretical and engineering fatigue study.

GRAPHICAL ABSTRACT

KEYWORDS:

• TC17 titanium alloy
• surface scratch
• surface roughness
• fatigue life evaluation
• fatigue failure

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability

The raw/processed data required to reproduce these findings cannot be shared at this time due to legal or ethical reasons.

Additional information

Funding

The authors gratefully acknowledge the financial support from the National Natural Science Foundations of China [Grant number 51875082], Chinese Postdoctoral Science Foundation [Grant number 2020M670734], National Defense Basic Scientific Research program of China [Grant number 2019-JCJQ-JJ-547] and the Fundamental Research Funds for the Central Universities of China [Grant number 3132020193], Liaoning Province Natural Science Foundation [Grant number 2020-HYLH-22]. Innovative Research Group Project of the National Natural Science Foundation of China