A cumulative fatigue damage formulation for persistent slip band type materials

Cordero, Leopoldo J.; Ahmadieh, A.; Mazumdar, P.

doi:10.1016/s0036-9748(88)80279-5

Cited by 7 publications

(1 citation statement)

References 5 publications

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“…The definition of damage has traditionally relied on the field variables chosen to describe the anticipated aging or degradation process. For example, for fatigue, damage variables used to describe the expected damage include the ratio of instantaneous to final crack lengths, 1 the linear summation of normalized number of cycles accumulated at different stresses (Miner’s 2 rule), the accumulation of normalized surface layer stress, 3 the cumulative plastic strain ratio, 4 the linear summation of persistent slip band length ratio, 5 the accumulation of the endurance limit ratio, 6,7 and the ratio of defect surface area to total cross-sectional area. 8 For wear damage, the local plastic deformation, 9 the wear volume, 10 and delamination of composites 11 have been used.…”

Section: Introductionmentioning

confidence: 99%

A thermodynamic entropy-based damage assessment with applications to prognostics and health management

Imanian

Modarres

2017

Structural Health Monitoring

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To advance the traditional structural integrity and life estimation approach, this article presents an explanation of damage and develops an alternative approach to damage assessment based on the fundamental laws of thermodynamics. This explanation provides a new way to perform prognostics and health management in terms of the irreversible thermodynamic framework. Specifically, it is proposed and demonstrated that entropy generated due to material degradation can be used as an index of damage. It is claimed that the use of an entropy-based damage index offers a unified and more comprehensive measure of damage. This is because energy dissipation associated with failure mechanisms that lead to material degradation involves irreversible processes, resulting in entropy generation, which is physically measurable as the materials degrade. We therefore conclude that entropy generation can be used to assess the degree of damage, the amount of the life of materials expended, and the extent of the life remaining. As an application of the proposed concept, this article discusses the entropic characterization of the corrosion-fatigue degradation mechanism, in which a standard entropy-based damage prognostics and health management approach is employed in integrity assessment and remaining useful life prediction of aluminum 7075-T651 specimens. Using entropy as a thermodynamic state function for damage characterization is shown to be effective in handling the endurance threshold uncertainties for prediction purposes.

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