Experimental observations of traction on grooved rods pulled from within cylindrical silos containing grains

In this work we present experimental results on the subject of frictional traction forces acting on cylindrical grooved rods, lying axi-symmetrically centered in a cylindrical silo. The experiments carried out for this study allowed us to measure the traction acting on the grooved rod for several filling heights, H, of a granular material. The experimental results showed how the traction forces were affected by the grooves on the rod. Comparisons could be made taking into account the traction measured experimentally for different grooved rods and to measure the effect of the lifting of the weights of the mass of grains and the outer cylinder for a smooth rod and grooved rod.