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The Role of Friction and Shear stress in the Jamming Transition

This discussion explores the role of friction and shear stress in the jamming transition, investigating topics such as viscosity, shear banding, and hysteresis in various experimental and simulation scenarios.

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The Role of Friction and Shear stress in the Jamming Transition

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  1. The Role of Friction and Shear stress in the Jamming Transition Antonio Coniglio Discussion Peter Schall University of Amsterdam

  2. h = s v / l shear z No friction, applied shear stress Viscosity h G Newtonian behavior ? . s= hg • System still homogeneous ? • Shear banding ? Protocol

  3. No friction, applied shear stress Experiments • Grains density-matched (no sedimentation) f>0.62 stress f<0.62 strain A. Fall and D. Bonn (unpublished)

  4. No friction, applied shear stress Experiments • 2D foam

  5. 16 d x 16 d F y z 8d No friction, applied shear stress Hysteresis 16 x 16 x 8 = 2048 particles How reliable is fc ? O‘Hern et al. 2003

  6. 16 d x 16 d F y z 8d No friction, applied shear stress Hysteresis 16 x 16 x 8 = 2048 particles Is fc a good measure ? Confining pressure p Particle overlap d d

  7. No friction, applied shear stress • Model: motion in energy landscape W(x) Crystal potential Jamming : general for solids, crystalline and amorphous systems

  8. Nature 2001 Science 2003

  9. Frictional particles Simulations at V = const but particles want to dilate ... Behavior at p = const ?

  10. Frictional particles Support simple scenario of dilation ?

  11. Frictional particles Experimental examples ? Relation with “Shear thickening“? (Suspensions under rapid shear, e.g. cornstarch, bullet-proof wests) Constant volume or pressure ? Constant pressure: Laplace pressure that holds particles in suspension

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