氏名：Shigenobu Ogata
所属：Graduate School of Engineering Science, The University of Osaka
概要：Purpose   Reveal the atomic scale structural mechanism of shear localization phenomenon in amorphous materials.
Outline   Through introducing two fundamental physical parameters, a universal structure-property relationship is
established.
Result   Shear localization is a prevalent phenomenon in amorphous materials undergoing plastic deformation, yet its underlying structural mechanism at the atomic scale remains elusive. Here we introduce a quantitative approach to correlate structural order and disorder with the degree of shear localization in amorphous materials. This approach relies on two fundamental physical parameters: the statistical structural order, derived from Shannon entropy of local Voronoi structures, and the localization susceptibility, characterized by spatial correlations in atomic-scale von Mises strain. Extensive atomistic simulations validate our approach and reveal a universal relationship between structural order and shear localization across a wide range of amorphous solids, each with distinct chemical compositions and thermal histories. We interpret the correlation between structural order and shear localization within a framework of shear banding as a mechanically-driven glass transition, governed by a structural collapse analogous to thermodynamic glass transitions on the potential energy landscape.