AI Article Synopsis
- Plasticity in soft amorphous materials, like granular solids, often involves collective patterns of deformation due to intense shearing.
- Traditional understanding of this plastic behavior relies on "Eshelby"-type events, which are sudden rearrangements that spread effects to nearby material.
- New research shows that frictional interactions in these materials create micro shear cracks that merge into larger fractures, influencing the transition from plastic behavior to brittle failure based on the level of friction present.
Article Abstract
Plasticity in soft amorphous materials typically involves collective deformation patterns that emerge on intense shearing. The microscopic basis of amorphous plasticity has been commonly established through the notion of "Eshelby"-type events, localized abrupt rearrangements that induce flow in the surrounding material via nonlocal elastic-type interactions. This universal mechanism in flowing disordered solids has been proposed despite their diversity in terms of scales, microscopic constituents, or interactions. Using a numerical particle-based study, we argue that the presence of frictional interactions in granular solids alters the dynamics of flow by nucleating micro shear cracks that continually coalesce to build up system-spanning fracturelike formations on approach to failure. The plastic-to-brittle failure transition is controlled by the degree of frictional resistance which is in essence similar to the role of heterogeneities that separate the abrupt and smooth yielding regimes in glassy structures.
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| http://dx.doi.org/10.1103/PhysRevE.100.012908 | DOI Listing |
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