[Transfert d’échelle en plasticité amorphe : effet du rajeunissement et du désordre]
Le transfert de l’échelle atomique à l’échelle mesocopique est étudié pour la plasticité d’un matériau amorphe modèle. En nous s’appuyant sur des résultats récents obtenus à l’échelle atomistique, nous discutons de l’intérêt d’un désordre de seuils enrichi par la connaissance du paysage désordonné à l’échelle atomique pour reproduire la physique de la plasticité amorphe. Nous montrons que la prise en compte d’un scénario de rajeunissement nous permet de reproduire de manière quasi-quantitative l’évolution de la limite d’élasticité locale moyenne et le comportement de localisation. Nous soulignons le rôle crucial de deux paramètres sans dimension : la force relative du désordre de la limite d’élasticité par rapport aux chutes de contraintes typiques associées à un réarrangement plastique, et le paramètre d’âge caractérisant la stabilité relative du verre initial par rapport au verre rajeuni qui émerge lors de la déformation par cisaillement.
The coarse-graining of amorphous plasticity from the atomistic to the mesoscopic scale is studied in the framework of a simple scalar elasto-plastic model. Building on recent results obtained on the atomistic scale, we discuss the interest of a disordered landscape-informed threshold disorder to reproduce the physics of amorphous plasticity. We develop a rejuvenation scenario that reproduces quasi-quantitatively the evolution of the mean local yield stress and the localization behavior. We emphasize the crucial role of two dimensionless parameters: the relative strength of the yield stress disorder with respect to the typical stress drops associated with a plastic rearrangement, and the age parameter characterizing the relative stability of the initial glass with respect to the rejuvenated glass that emerges upon shear deformation.
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Mot clés : verre, plasticité, mésoscopique, amorphe, dynamique moléculaire, agraindissement
CC-BY 4.0
@article{CRPHYS_2023__24_S1_113_0,
author = {Botond Tyukodi and Armand Barbot and Reinaldo Garc{\'\i}a-Garc{\'\i}a and Matthias Lerbinger and Sylvain Patinet and Damien Vandembroucq},
title = {Coarse-graining amorphous plasticity: impact of rejuvenation and disorder},
journal = {Comptes Rendus. Physique},
pages = {113--131},
publisher = {Acad\'emie des sciences, Paris},
volume = {24},
number = {S1},
year = {2023},
doi = {10.5802/crphys.156},
language = {en},
}
TY - JOUR AU - Botond Tyukodi AU - Armand Barbot AU - Reinaldo García-García AU - Matthias Lerbinger AU - Sylvain Patinet AU - Damien Vandembroucq TI - Coarse-graining amorphous plasticity: impact of rejuvenation and disorder JO - Comptes Rendus. Physique PY - 2023 SP - 113 EP - 131 VL - 24 IS - S1 PB - Académie des sciences, Paris DO - 10.5802/crphys.156 LA - en ID - CRPHYS_2023__24_S1_113_0 ER -
%0 Journal Article %A Botond Tyukodi %A Armand Barbot %A Reinaldo García-García %A Matthias Lerbinger %A Sylvain Patinet %A Damien Vandembroucq %T Coarse-graining amorphous plasticity: impact of rejuvenation and disorder %J Comptes Rendus. Physique %D 2023 %P 113-131 %V 24 %N S1 %I Académie des sciences, Paris %R 10.5802/crphys.156 %G en %F CRPHYS_2023__24_S1_113_0
Botond Tyukodi; Armand Barbot; Reinaldo García-García; Matthias Lerbinger; Sylvain Patinet; Damien Vandembroucq. Coarse-graining amorphous plasticity: impact of rejuvenation and disorder. Comptes Rendus. Physique, Volume 24 (2023) no. S1, pp. 113-131. doi : 10.5802/crphys.156. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.156/
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