A thermodynamic approach to fatigue damage accumulation under variable loading

Document Type

Article

Publication Date

1-1-2010

Abstract

We put forward a general procedure for assessment of damage evolution based on the concept of entropy production. The procedure is applicable to both constant- and variable amplitude loading. The results of a series of bending fatigue tests under both two-stage and three-stage loadings are reported to investigate the validity of the proposed methodology. Also presented are the results of experiments involving bending, torsion, and tension-compression fatigue tests with Al 6061-T6 and SS 304 specimens. It is shown that, within the range of parameters tested, the evolution of fatigue damage for these materials in terms of entropy production is independent of load, frequency, size, loading sequence and loading history. Furthermore, entropy production fractions of individual amplitudes sums to unity. © 2010 Elsevier B.V.

Publication Source (Journal or Book title)

Materials Science and Engineering: A

First Page

6133

Last Page

6139

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