Rejuvenation and shear banding in model amorphous solids - Archive ouverte HAL Access content directly
Journal Articles Physical Review E Year : 2020

Rejuvenation and shear banding in model amorphous solids


We measure the local yield stress, at the scale of small atomic regions, in a deeply quenched two-dimensional glass model undergoing shear banding in response to athermal quasistatic deformation. We find that the occurrence of essentially a single plastic event suffices to bring the local yield stress distribution to a well-defined value for all strain orientations, thus essentially erasing the memory of the initial structure. It follows that in a well-relaxed sample, plastic events cause the abrupt (nucleation-like) emergence of a local softness contrast and thus precipitate the formation of a band, which, in its early stages, is measurably softer than the steady-state flow. Moreover, this postevent yield stress ensemble presents a mean value comparable to that of the inherent states of a supercooled liquid around the mode-coupling temperature T MCT. This, we argue, explains that the transition between brittle and ductile yielding in amorphous materials occurs around a comparable parent temperature. Our data also permit to capture quantitatively the contributions of pressure and density changes and demonstrate unambiguously that they are negligible compared with the changes of softness caused by structural rejuvenation.
Fichier principal
Vignette du fichier
Barbot_PRE_2020.pdf (2.56 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-02509357 , version 1 (16-03-2020)



Armand Barbot, Matthias Lerbinger, Anael Lemaitre, Damien Vandembroucq, Sylvain Patinet. Rejuvenation and shear banding in model amorphous solids. Physical Review E , 2020, 101 (3), ⟨10.1103/PhysRevE.101.033001⟩. ⟨hal-02509357⟩
198 View
164 Download



Gmail Facebook X LinkedIn More