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• W2064675488 abstract "We study the impact of strain localization on the stability of frictional slipping in dense amorphous materials. We model the material using shear transformation zone (STZ) theory, a continuum approximation for plastic deformation in amorphous solids. In the STZ model, the internal state is quantified by an effective disorder temperature, and the effective temperature dynamics capture the spontaneous localization of strain. We study the effect of strain localization on stick-slip instabilities by coupling the STZ model to a noninertial spring slider system. We perform a linear stability analysis to generate a phase diagram that connects the small scale physics of strain localization to the macroscopic stability of sliding. Our calculations determine the values of spring stiffness and driving velocity where steady sliding becomes unstable and we confirm our results through numerical integration. We investigate both homogeneous deformation, where no shear band forms, and localized deformation, where a narrow shear band spontaneously forms and accommodates all of the deformation. Our results show that at a given velocity, strain localization leads to unstable frictional sliding at a much larger spring stiffness compared to homogeneous deformation, and that localized deformation cannot be approximated by a homogeneous model with a narrower material. We also find that strain localization provides a physical mechanism for irregular stick-slip cycles in certain parameter ranges. Our results quantitatively connect the internal physics of deformation in amorphous materials to the larger scale frictional dynamics of stick-slip." @default.
• W2064675488 created "2016-06-24" @default.
• W2064675488 creator A5028888093 @default.
• W2064675488 creator A5048096741 @default.
• W2064675488 date "2009-12-15" @default.
• W2064675488 modified "2023-10-17" @default.
• W2064675488 title "Stick-slip instabilities and shear strain localization in amorphous materials" @default.
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• W2064675488 doi "https://doi.org/10.1103/physreve.80.066113" @default.
• W2064675488 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20365237" @default.
• W2064675488 hasPublicationYear "2009" @default.
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