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Dynamique et complexité de la déformation plastique : étude par émission acoustique

Abstract : Acoustic emission is a powerful tool for studying dislocations avalanches, in the same time in energy, time and space domains. Previous acoustic emission measurements performed during the creep of ice single crystals revealed a strong intermittency of plastic flow, which was combined with power law distributions of avalanche sizes. The experiments carried out during this thesis showed a breakdown of the scale-free critical behaviour in ice polycristals due to a complex finite (grain)-size effect. Our experiments also revealed power law distributions of avalanche sizes and temporal correlations similar as those observed in ice for single crystals of Cd, Zn and Cu. In particular, temperature, forest hardening, twinning and symmetrical multiple slip did not affect the value of the critical exponent. These results hence suggest that plasticity in single crystals might be ruled by an universal dynamics.
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https://tel.archives-ouvertes.fr/tel-00118329
Contributor : Thiebaud Richeton <>
Submitted on : Monday, December 4, 2006 - 9:49:49 PM
Last modification on : Thursday, November 19, 2020 - 3:54:26 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 7:08:54 PM

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Thiebaud Richeton. Dynamique et complexité de la déformation plastique : étude par émission acoustique. Mécanique [physics.med-ph]. Institut National Polytechnique de Grenoble - INPG, 2006. Français. ⟨tel-00118329⟩

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