Experimental determination of entropy and exergy in low cycle fatigue

•Two methods are given to estimate the FFE by only using the temperature measurements.•A constant value of the FFE for the Al-2024 is here observed experimentally.•The initial work hardening produces one fifth of the FFE.•The Park and Nelson model seems in accordance with the two methods. Recent wor...

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Bibliographic Details
Published in:International journal of fatigue 2020-07, Vol.136, p.105333, Article 105333
Main Authors: Ribeiro, Patrick, Petit, Johann, Gallimard, Laurent
Format: Article
Language:English
Subjects:
Boundary conditions
Convection
Crack propagation
Engineering Sciences
Entropy
Exergy
Fatigue failure
Fatigue tests
Fracture fatigue entropy
Heat transfer
Low cycle fatigue
Materials fatigue
Thermography
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Summary:•Two methods are given to estimate the FFE by only using the temperature measurements.•A constant value of the FFE for the Al-2024 is here observed experimentally.•The initial work hardening produces one fifth of the FFE.•The Park and Nelson model seems in accordance with the two methods. Recent works in mechanical fatigue consider that a threshold of entropy exists, the fracture fatigue entropy. In this paper, we observe the existence of a threshold of entropy and exergy in low cycle fatigue for a flat Al-2024 specimen measuring the heat generated during a fatigue test. Results are compared considering various hypotheses (1D heat dissipation with convection and radiation considered as complementary parts, and, heat transfer from a fin with convection and radiation as boundary conditions) to an empirical mechanical model known in the literature and deviations between them are discussed.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2019.105333