We measure shear response in packings of glass beads by pulling a thin, rough, metal plate vertically through a bed of volume fraction φ, which is set, before the plate is pulled, in the range 0.575 to 0.628. The yield stress is velocity independent over 4 decades and increases exponentially with φ, with a transition at φ ≈ 0.595. An analysis of the measured force fluctuations indicates that th...

We study the propagation of dynamic jamming fronts in a dense cornstarch suspension generated by towed body. Previous studies have investigated this phenomenon under pushing, pulling, or shearing, separately. In our experiment we are able to show how front propagates full field surrounding cylinder experiencing and shearing simultaneously. Though propagate symmetrically transverse direction mov...

[1] Pore fluid pressure plays an important role in the frictional strength and stability of tectonic faults. We report on laboratory measurements of porosity changes associated with transient increases in shear velocity during frictional sliding within simulated finegrained quartz fault gouge (d50 = 127 mm). Experiments were conducted in a novel true triaxial pressure vessel using the double-di...

Liquefaction resistance of sand can be either increased or reduced due to an undrained cyclic pre-shearing depending on the degree pre-shearing, which hinders a better prediction liquefaction potential established. The mechanism such changes in has been poorly understood. This contribution aims gain micromechanical insights into effects using discrete element method (DEM) simulations. In partic...

‎In this paper‎, ‎we study the convex combinations of harmonic mappings obtained by shearing a class of slit conformal mappings‎. ‎Sufficient conditions for the convex combinations of harmonic mappings of this family to be univalent and convex in the horizontal direction are derived‎. ‎Several examples of univalent harmonic mappings constructed by using these methods are presented to illustrate...