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On the Evidence of Thermodynamic Self-Organization during Fatigue: A Review

by Mehdi Naderi 1,2
1
Technical Data Analysis Inc., Falls Church, VA 22042, USA
2
Department of Mechanical and Aerospace Engineering, George Washington University, Washington, DC 20052, USA
Entropy 2020, 22(3), 372; https://doi.org/10.3390/e22030372
Received: 16 February 2020 / Revised: 21 March 2020 / Accepted: 22 March 2020 / Published: 24 March 2020
(This article belongs to the Special Issue Review Papers for Entropy)
In this review paper, the evidence and application of thermodynamic self-organization are reviewed for metals typically with single crystals subjected to cyclic loading. The theory of self-organization in thermodynamic processes far from equilibrium is a cutting-edge theme for the development of a new generation of materials. It could be interpreted as the formation of globally coherent patterns, configurations and orderliness through local interactivities by “cascade evolution of dissipative structures”. Non-equilibrium thermodynamics, entropy, and dissipative structures connected to self-organization phenomenon (patterning, orderliness) are briefly discussed. Some example evidences are reviewed in detail to show how thermodynamics self-organization can emerge from a non-equilibrium process; fatigue. Evidences including dislocation density evolution, stored energy, temperature, and acoustic signals can be considered as the signature of self-organization. Most of the attention is given to relate an analogy between persistent slip bands (PSBs) and self-organization in metals with single crystals. Some aspects of the stability of dislocations during fatigue of single crystals are discussed using the formulation of excess entropy generation. View Full-Text
Keywords: self-organization; non-equilibrium thermodynamics; fatigue; persistent slip bands; dislocations self-organization; non-equilibrium thermodynamics; fatigue; persistent slip bands; dislocations
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Naderi, M. On the Evidence of Thermodynamic Self-Organization during Fatigue: A Review. Entropy 2020, 22, 372.

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