Effect Of Surface Finish On Fatigue Life Of Component

Muhammad Faiz, Mohd Timyati (2009) Effect Of Surface Finish On Fatigue Life Of Component. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Generally, Surface roughness is one of the factors that affect fatigue-life of a component that cause microscopic stress concentrations that lower the fatigue strength. Surface finish is often of great concern factor because of their impact on product performance. The main purpose of this study is to investigate the effect of surface finish on fatigue life of components. In practice, a mechanical part is exposed to a complex, often random, sequence of loads, large and small. Fatigue is the progressive and localized structural damage that occurs when a material is subjected to cyclic loading. This study focuses on the effect of surface finish on fatigue life of components. Work materials have been studied is AISI 1020 of 68 HRC. Cutting test were conducted on Computer Numerical Control (CNC) lathe machine model SL-20. The cutting tools used is tungsten carbide coated by titanium nitride (TiN) and all work material were machined at the different cutting parameter in order to produce different surface finish. Feed rate used are 0.066, 0.166, and 0.266 with constant cutting speed, Vc = 63 m/min and dept of cut = 0.2mm. Roughness value (Ra) is taken through by portable surface roughness tester. Evaluation of the test results indicated that the smooth surface have more long life span. It also becomes apparent from this studies that feed rate have influence on the surface finish.

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