AI Article Synopsis
- This study uses particle-based simulations to explore how stress-activated constraints affect discontinuous shear thickening (DST) and shear jamming (SJ) in suspensions, particularly focusing on resistance due to rolling friction.
- It finds that rolling friction lowers the volume fraction needed for DST and SJ, aligning with observed behaviors in real-world suspensions that have adhesive surfaces and rough particle shapes.
- Overall, the research highlights that rolling friction significantly alters the frictional force network and contributes to increased viscosity in these materials, making it essential for understanding shear-thickening behavior.
Article Abstract
Particle-based simulations of discontinuous shear thickening (DST) and shear jamming (SJ) suspensions are used to study the role of stress-activated constraints, with an emphasis on resistance to gearlike rolling. Rolling friction decreases the volume fraction required for DST and SJ, in quantitative agreement with real-life suspensions with adhesive surface chemistries and "rough" particle shapes. It sets a distinct structure of the frictional force network compared to only sliding friction, and from a dynamical perspective leads to an increase in the velocity correlation length, in part responsible for the increased viscosity. The physics of rolling friction is thus a key element in achieving a comprehensive understanding of strongly shear-thickening materials.
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| http://dx.doi.org/10.1103/PhysRevLett.124.248005 | DOI Listing |
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