Which factors affect fatigue life

Juvinall, R. Esin, A. Cazaud, R. Fenner, A. Dolan, T. Handbook , Pt. Morrison, J. Instn Mech. Engrs , , CrossRef Google Scholar. Morkovin, D. Matis , 44 , Google Scholar. Phillips, C. Engrs , W. Pope, J. Heywood, R. Lipson, C. Coyle, M. Engrs , , — CrossRef Google Scholar. Hanley, B. Sines, G. Mattson, R. Rassweiler, G. Almen, J. Faires, V. Horger, O. Handbook Pt. Grover, H. Quality management standards designed to facilitate the consistency of a product or service.

Semiconductors, medical equipment, lasers, optics and aviation and aerospace. What is ISO Quality management standards designed to facilitate the consistency of a product or service. Laser Focus World Semiconductors, medical equipment, lasers, optics and aviation and aerospace.

Lower Die Cast Cost 12 ways to reduce the cost of custom die cast components. Toggle Menu. As mentionsed in the introduction , many factors may affect the fatigue life of an engineering material, including Material defects Surface roughness and surface treatments Imperfection in assembly or functionality requirements in design Size Loading types Harsh environments Damage in service Poor maintenance and improper repair Some of these factors are addressed in this page.

Please click the links or scroll down for details. Size Effect Generally speaking, the large the component, the more initial imprefections within the component. Experiments done on carbon steel alloy found that the diameter of steel rod does affect the fatigue life when the rod is under axial tension-compression loading.

Units » Volume » Jigger. Units » Amount of Substance » Entities. Design Home. Fracture Mechanics. Generally speaking, the large the component, the more initial imprefections within the component. For common steel alloys, the size-effect can be approximated by the following formula: where f1 is the unknown fatigue limit for a critically stressed V 1 and f0 is the known fatigue limit for a critically stressed V 0.

For many common types of loading, such as bending and torsion, the maximum stress occurs at the surface. Furthermore, the surface is exposed to harsh environments such as corrosion, or unexpected loads such as scratch and impact. In addition, experiments show that even the failure of axial loading usually begins at the surface. Modification of the design to avoid stress concentration by eliminating sharp recess and severe stress raisers. Precise control of surface finish by avoiding damage to surface by rough machining, punching, stamping, shearing etc.

Control of corrosion and erosion or chemical attack in service and prevention of surface decarbonisation during processing or heat treatment. Surface treatment of metal.