The self-organized criticality as an explanation of fatigue failure for shape memory alloys

Abstract : In this thesis we put forward a new set of ideas to open the way to experimentally distinguish various stages in the micro-development of fatigue using the framework of the self-organized criticality (SOC). The demonstration is made that the fatigue process belongs to this class of systems and the SOC theory is used to build quantifiers that describe the dissipative regime of the material. The approach, to build these predictors, is based on the study of the multi-scale statistical structure of the intermittent acoustic signal generated by the cyclically loaded sample. The originality of the analysis lies in the interpretation of the statistics in the framework of SOC that enables to draw parallels with a wide range of natural phenomena. The main discoveries of the thesis are that acoustic emissions permit to reveal different dissipative regimes in the fatigue of shape memory alloys and each of these regimes is characterized by a different energy- time structure that is well illustrated through the SOC formalism and the associated power-law distributions. The proofs are also given that the same critical dynamics can hold from the large scale of earthquakes down to the microscopic scale of the sample structure.
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Contributor : Clement Dunand-Chatellet <>
Submitted on : Thursday, June 7, 2012 - 10:55:58 AM
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Clement Dunand-Chatellet. The self-organized criticality as an explanation of fatigue failure for shape memory alloys. Materials Science [cond-mat.mtrl-sci]. Ecole Polytechnique X, 2012. English. ⟨pastel-00705246⟩

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