Preprint Article Version 1 This version is not peer-reviewed

Experimental Determination of Entropy and Exergy in Low Cycle Fatigue

Version 1 : Received: 17 May 2019 / Approved: 20 May 2019 / Online: 20 May 2019 (12:28:02 CEST)
Version 2 : Received: 10 November 2019 / Approved: 13 November 2019 / Online: 13 November 2019 (10:28:55 CET)

How to cite: Ribeiro, P.; Petit, J.; Gallimard, L. Experimental Determination of Entropy and Exergy in Low Cycle Fatigue. Preprints 2019, 2019050250 (doi: 10.20944/preprints201905.0250.v1). Ribeiro, P.; Petit, J.; Gallimard, L. Experimental Determination of Entropy and Exergy in Low Cycle Fatigue. Preprints 2019, 2019050250 (doi: 10.20944/preprints201905.0250.v1).

Abstract

Recent works in mechanical fatigue consider that a threshold of entropy exists, the fracture fatigue entropy. The determination of this quantity is usually done considering empirical models for the mechanical power estimation. In this paper, we experimentally observe the existence of a threshold of entropy and exergy in low cycle fatigue for a flat Al-2024 specimen avoiding the use of a model, solely measuring the heat generated during a fatigue test. Results are then compared considering various hypotheses (1D heat dissipation with convection and radiation considered as heat sources, 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.

Subject Areas

Fracture Fatigue Entropy ; Thermography ; Exergy

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