Investigation of Titanium Alloy Material by Mixing of Plain and Fretting Fatigues

Abstract

The material failure occurred is categorized into different types such as the fatigue. Fatigue itself can be categorized also into fretting and plain. Several studies have been placed to investigate the material performance under only one condition of these mentioned types. No testing methods were considered in the literature to investigate the required material by mixing of plain and fretting fatigues. Such mixing environment is where most of the parts and system components are subject to in many applications. The aim of this paper is to examine the behavior of the material under the condition of combined plain and fretting fatigues. Experimental study was carried out on Titanium alloy to understand its behavior under combination between plain and fretting fatigue. Five tests were carried out under different cycles load ratio between plain and fretting fatigues. If initially 50% of the cyclic life of fretting fatigue life was applied and then followed by the cycles of plain fatigue till failure occurred, it is found that the plain fatigue has no impact on the life of the material as compared to fretting fatigue. Such observation displays that utmost of the material fretting fatigue life is consumed in the initiation of the crack. Additionally, the cycle ratio between the plain fatigue and the fretting fatigue has a huge effect on the material fatigue life. For example, when the ratio decreases, the impact of the fretting fatigue increases which in turn results in the reduction of the fatigue life. This work was conducted considering only a constant contact applied load, hence it is imperative to consider variable contact load to inspect the life of the material with mixing of both plain and fretting fatigues.