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Shear-induced solidification of athermal systems with weak attraction
Wen Zheng1, Hao Liu1, Ning Xu1
1CAS Key Laboratory of Soft Matter Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China.
Physical Review. E
|January 14, 2017
Summary
Shear stress drives weakly attractive frictionless particles into solid states. The study reveals a jamming phase diagram, distinguishing gel-like and jamming-like states based on shear stress and structure.
Area of Science:
- Physics
- Materials Science
- Soft Matter Physics
Background:
- Jamming transition describes the rigidity of granular materials.
- Understanding particle interactions, like weak attractions, is key to predicting material states.
Purpose of the Study:
- To investigate how shear stress influences the solid-like states of frictionless particles with weak attractions.
- To map the jamming phase diagram for these systems.
Main Methods:
- Simulations of frictionless particles with tunable weak attractions.
- Application of controlled shear stress to observe structural and mechanical responses.
- Analysis of the density of vibrational states (DOVS) and force networks.
Main Results:
- Unjammed packings transition to solid-like states under shear, evolving from gel-like to jamming-like structures.
- Shear stress significantly impacts the density of vibrational states and force networks.
- A critical shear stress (σc) defines isostaticity and marginally jammed states, separating distinct solid behaviors.
Conclusions:
- Shear stress is a critical parameter in determining the properties of shear-driven solids.
- The study establishes a phase diagram connecting gel-like and jamming-like states.
- Distinctions and connections between these states are clarified based on shear stress and structural properties.
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