Abstract
Aircraft engines, fuselage, automobile parts, and energy saving strategies in general have promoted the interest and research in the field of lightweight materials, typically on alloys based on aluminum. Aluminum alloy itself does not have suitable wear resistance; therefore, it is necessary to enhance surface properties for practical applications, particularly when aluminum is in contact with other parts. Fretting fatigue phenomenon occurs when two surfaces are in contact with each other and one or both parts are subjected to cyclic load. Fretting drastically decreases the fatigue life of materials. Therefore, investigating the fretting fatigue life of materials is an important subject. Applying surface modification methods is anticipated to be a supreme solution to gradually decreasing fretting damage. In this paper, the authors would like to review methods employed so far to diminish the effect of fretting on the fatigue life of Al7075-T6 alloy. The methods include deep rolling, shot peening, laser shock peening, and thin film hard coatings. The surface coatings techniques are comprising physical vapor deposition (PVD), hard anodizing, ion-beam-enhanced deposition (IBED), and nitriding.
Highlights
Fretting fatigue phenomenon occurs when two surfaces in contact simultaneously encounter sliding movements and fluctuating loads
From a comparative study between deep rolling (DR) and Shot peening (SP), it is concluded that (i) at low cyclic fatigue the SP technique improves the material’s fretting fatigue behavior more efficiently than DR; (ii) a 300% improvement has been attained for the SPtested specimen; (iii) the influence of DR on fretting fatigue resistance proved more effective for high cycle fatigue; for example, there was an increase of up to 700% for DR at higher forces of rolling; (iv) with decreasing the force of rolling, the trend of increase in fatigue life slowed down; (v) the surface modification technique has direct impact on the friction coefficient such that the highest and lowest friction coefficients, 0.70 and 0.45, were achieved for the low force deep-rolled and intact sample, respectively
The results show that the fretting fatigue life of specimens with no surface modification is much higher than nitrided specimens
Summary
Fretting fatigue phenomenon occurs when two surfaces in contact simultaneously encounter sliding movements and fluctuating loads. Fretting fatigue occurs when an oscillatory movement with low amplitude between two surfaces is remaining for a large number of cycles [1]. This event can result in two different types of damage: fretting fatigue and fretting wear [2,3,4]. The material’s resistivity against fretting fatigue is influenced by contact configuration, slipping amplitude, or surface conditions like lubrication, hardness, friction coefficient, and roughness [12]. The material’s durability to fretting fatigue is significantly increased by enhanced surface conditions such as roughness, hardness, and lowered friction coefficient, something achievable by surface treatment techniques like surface-coatings, deep rolling, and shot peening that may postpone crack initiation. Shot peening, TiN coating, CrN coating, and nitriding surface treatments are discussed
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