Fatigue Control Method Essay

696 Words Oct 27th, 2011 3 Pages
Fatigue Wear Control Method
Lowering the coefficient of friction between two contact surface is the most effective way of preventing fatigue-based wear. The surface traction forces are insufficient for delamination in sliding or contact fatigue in rolling to occur if low coefficient friction. Another important aspect in controlling fatigue wear in both sliding and rolling is the material “cleanliness”. Clean material with with minimum imperfections should be selected for sliding and rolling contacts. Enhancement of material properties such as hardness, to reduce crack growth can also be benificial in some cases. However, this method is limited by the increased brittleness of hard materials. These are several methods that used in industry
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1.2 Laser peening

Laser peening is the process of hardening metal using powerful laser. A unique high energy laser is fired at the surface of a metal part. The laser will impact impart a layer of residual compressive stress.

2. Hardening Hardening is metallurgical process that used to increase hardness of material.hardness of metal is directly propotional to uniaxial yield strength. More harder metal will have more high resistance to plastic deformation. High resistance og plastic deformation will slow the fatigue process.
3. Coating Coating is a covering that applied to the surface of an object. Its involve the application of thin firm of functional material to a substrate. Coating may be applied as liquids, gases or solids. Surface properties such as roughness, hardness and plasticity are critical to preventing wear and fatigue. Instead of “surface finishing” a surface, to improve its anti-wear and anti-fatigue properties, coating can be applied. Coating are applied to surface to prevent wear during the initial operation of a machine part (break-in).

4. Drill stop Fatigue crack that have begun to propogate can sometimes be stop by drilling holes, called drill stop in the path of fatigue crack. However, this method has limitation that is the holes represent a stress concentration factor which depends on the hole and geometry, though the hole is typically less of a stress concentration than the removed tip

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