[SY-E6] Continuum elasticity and correlations of plastic strain fluctuations in sheared glasses: The effect of hard boundaries
Spatial correlations of plastic strain fluctuations in a shear-driven amorphous solid are investigated in the vicinity of a hard wall with a molecular-scale corrugation [1]. Within thin slabs parallel to the wall plane, normalized correlations are enhanced when the slab center is closer to the wall. The amplitude of these correlations, however, is found to be suppressed by the wall. It is shown in this work that the enhancement of the normalized correlations quantitatively matches with the wall-induced enhancement of the elastic propagator within continuum elasticity [1,2]. The decrease of strain amplitude, on the other hand, is shown to originate from molecular scale wall effects on the size of the nearest neighbor cage, explored by particles on intermediate times scales [1]. These results highlight the fundamental role of elasticity for the correlation of plastic activity in glassy systems [3].
[1] M. Hassani, P. Engels and F. Varnik, Wall effects on spatial correlations of non-affine strain in a 3D model glsss (Europhysics Leters 2018, in press).
[2] A. Nicolas and J.-L. Barrat, A mesoscopic model for the rheology of soft amorphous solids, with application to microchannel flows, Faraday Discuss. 167, 567 (2013).
[3] F. Varnik, S. Mandal, V. Chikkadi, D. Denisov, P. Olsson, D. Vagberg, D. Raabe, and P. Schall, Correlations of plasticity in sheared glasses, Phys. Rev. E 89, 040301 (2014).
[1] M. Hassani, P. Engels and F. Varnik, Wall effects on spatial correlations of non-affine strain in a 3D model glsss (Europhysics Leters 2018, in press).
[2] A. Nicolas and J.-L. Barrat, A mesoscopic model for the rheology of soft amorphous solids, with application to microchannel flows, Faraday Discuss. 167, 567 (2013).
[3] F. Varnik, S. Mandal, V. Chikkadi, D. Denisov, P. Olsson, D. Vagberg, D. Raabe, and P. Schall, Correlations of plasticity in sheared glasses, Phys. Rev. E 89, 040301 (2014).