AI Article Synopsis
- The study investigates how certain areas (called "hot spots") in a glassy material experience strong deformations during slow shear, using a specialized technique to analyze these changes.
- These hot spots are regions about 10 grains in size that cluster together, leading to the formation of shear bands in the material.
- The frequency of these hot spots correlates with overall plastic deformation, providing insights into the "fluidity" concept that helps explain the behavior of soft glassy materials.
Article Abstract
We study experimentally the dynamical heterogeneities occurring at slow shear, in a model amorphous glassy material, i.e., a 3D granular packing. The deformation field is resolved spatially by using a diffusive wave spectroscopy technique. The heterogeneities show up as localized regions of strong deformations spanning a mesoscopic size of about 10 grains and called the "hot spots." The spatial clustering of hot spots is linked to the subsequent emergence of shear bands. Quantitatively, their appearance is associated with the macroscopic plastic deformation, and their rate of occurrence gives a physical meaning to the concept of "fluidity," recently used to describe the local and nonlocal rheology of soft glassy materials.
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| http://dx.doi.org/10.1103/PhysRevLett.108.135502 | DOI Listing |
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