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Which of the following process does NOT affect the fatigue life of a component?

Which of the following process does NOT affect the fatigue life of a component? Correct Answer Polishing

Explanation:

Fatigue life:

  • Fatigue life is defined as the number of loading (stress) cycles of a specified character that a specimen sustains before failure of a specified nature occurs. The number of cycles is related to engine speed. It can be converted to equivalent durability hours. Fatigue life is affected by cyclic stresses, residual stresses, material properties, internal defects, grain size, temperature, design geometry, surface quality, oxidation, corrosion, etc.
  • In the assessment of the risk of fatigue failure, it may be assumed that the component is safe for an infinite number of cycles if it does not show failures after more than ten million cycles.
  • The total fatigue life is equal to the life of crack formation and cracks propagation. Fatigue life is dependent on the cycle history of the loading magnitude since crack initiation requires larger stress than crack propagation.
  • The fatigue life of the component can be determined by the strain, stress, or energy approach. Fatigue is a very complex process affected by many factors. It is usually more effective to use a macro phenomenological method to model the effects of fatigue mechanisms on fatigue life rather than using a microscopic approach.
  • Polishing: 
    • ​Polishing is an art as well as a science. This metal surface finishing method is one of the best means of creating parts with aesthetic appeal. Not only do these parts look great, but they also function better and last longer with a polishing surface finish.

    • Polishing does not affect the fatigue life of the component.​

Additional InformationShot peening:

  • Shot peening is a cold work process used to impart compressive residual stresses onto the surface of a component, which results in modified mechanical properties. The shot peening process is used to add strength and reduce the stress profile of components.
  • Shot peening works by striking a surface with a shot (round metallic, glass, or ceramic particle) with enough force to generate plastic deformation. When a group of shots impacts the surface they generate multiple indentations, resulting in the component being encased by a compressively stressed layer on the metal surface.

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Electroplating:

  • Electroplating is a process that uses an electric current to reduce dissolved metal cations so that they form a thin coherent metal coating on an electrode.
  • Electroless plating, also known as chemical or auto-catalytic plating, is a non-galvanic plating method that involves several simultaneous reactions in an aqueous solution, which occur without the use of external electrical power.
  • It is mainly different from electroplating by not using external electrical power. Plating an object makes it tougher and improves the corrosion resistance of the material. Electroplating and electroless plating can be used to create a protective coating for materials that will be used in the medical field.

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