Related Experiment Videos
Structure and stability of the interface between a strained crystal and a shearing liquid
Scott Butler1, Peter Harrowell
1School of Chemistry, University of Sydney, New South Wales 2006, Australia.
Summary
Nonequilibrium molecular dynamics simulations reveal how shearing liquids interact with strained crystals. Increased shear stress enhances velocity field penetration, with stick-slip motion governing interfacial flow and stability.
Area of Science:
- Materials Science
- Chemical Engineering
- Computational Physics
Background:
- Understanding the behavior of interfaces between liquid and solid phases under shear is crucial for various applications.
- Nonequilibrium phenomena at interfaces govern material properties and processing.
Purpose of the Study:
- To investigate the stationary nonequilibrium interface between a shearing liquid and a strained crystal.
- To elucidate the mechanisms of velocity field penetration and interfacial flow.
Main Methods:
- Nonequilibrium molecular dynamics (NEMD) simulations were employed.
- Analysis of velocity field penetration, shear stress, and interfacial motion.
Main Results:
- Velocity field penetration into the crystal increases with shear stress.
- Interfacial flow exhibits stick-slip motion, with slip linked to disordering.
- Macroscopic behavior is described by a stick boundary condition.
Conclusions:
- The interface exhibits complex dynamics, including intermittent stick-slip motion.
- A theoretical model based on crystallization and erosion rates reasonably predicts interfacial stability.
- Results provide insights into the mechanical behavior of sheared interfaces.