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An energy-balance approach to the problem of fatigue-crack growth

✍ Scribed by A.K. Chakrabarti

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
998 KB
Volume
10
Category
Article
ISSN
0013-7944

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✦ Synopsis

An energy-balance approach to the problem of fatigue-crack propagation is considered here, the basic premise being that the energy equivalent of the work input in fatigue over a period of time At must be greater than or equal to the energy dissipated in the form of heat together with the energy required to produce the plastic zone ahead of the crack tip and to create the necessary free surface for crack propagation over the same time period At. A fatigue-crack-growth (FCG) rate equation has been formulated based upon the above energy-balance concept. The fatigue-crack-growth rate is found to be inversely proportional to the plastic work and the energy requirement for the creation of new surfaces and directly proportional to the fatigue input energy. An experimental approach for determining the fatigue-crackpropagation rate using the energy-balance concept has been outlined.

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