Beyond linear elasticity: Jammed solids at finite shear strain and rate

Boschan, Julia and Vagberg, Daniel and Somfai, Ellák and Tighe, Brian P. (2016) Beyond linear elasticity: Jammed solids at finite shear strain and rate. Soft Matter, 12. pp. 5450-5460. ISSN 1744-683X

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The shear response of soft solids can be modeled with linear elasticity, provided the forcing is slow and weak. Both of these approximations must break down when the material loses rigidity, such as in foams and emulsions at their (un)jamming point – suggesting that the window of linear elastic response near jamming is exceedingly narrow. Yet precisely when and how this breakdown occurs remains unclear. To answer these questions, we perform computer simulations of stress relaxation and shear start-up tests in athermal soft sphere packings, the canonical model for jamming. By systematically varying the strain amplitude, strain rate, distance to jamming, and system size, we identify characteristic strain and time scales that quantify how and when the window of linear elasticity closes, and relate these scales to changes in the microscopic contact network.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika > QC01 Mechanics / mechanika
Depositing User: Ellák Somfai
Date Deposited: 03 Oct 2016 14:21
Last Modified: 03 Oct 2016 14:21

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