Investigation Of Shot Peening On The Fatigue Strength Of Aluminium Alloy

Nithya , Selvakumaran (2009) Investigation Of Shot Peening On The Fatigue Strength Of Aluminium Alloy. Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

Fatigue life is one of the most important mechanical properties of materials used in industrial application that need to be analyzed. This is because fatigue failures are sudden and occur without warning. Shot peening is a surface treatment process that can increase the fatigue life through incorporating the compressive residual stress on the surface of the component. This study investigates the effect of shot peening on the fatigue life of the 7075-T6 Aluminum alloy. The specimens are in the form of plates and bombarded with stainless steel shots. This study focuses on the effect of the stainless steel ball shot intensity on the resultant compressive residual stress and thus the fatigue life of the Aluminum alloy. Shot peening process increases the surface roughness of the component but this negative effect is compromised because of the significant benefit obtained through the increase in fatigue life. Thus the surface roughness of the specimens was analyzed after the shot peening process. The result shows that surface roughness increases as the shot intensity is increased. Axial Fatigue Test was done to determine the fatigue life. The obtained S-N curve showed that there is considerable increase in fatigue life as the shot intensity is increased. However, the shot intensity cannot be overdone because the bombardment can cause cracks in the surface that act as stress raisers. The obtained result also shows that shot peening accelerates fatigue crack growth if shot peening was executed on specimens with cracks on the surface.

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