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  • A Ring Torsion Apparatus for Evaluating Friction Between Soil and Metal Surfaces
    ...four points, as shown in Fig. 3, to a uniform normal stress on the surface of sand. The lower surface of each ring was finished to a different rough- ness that was quantified in terms of a maximum height Rmax , defined as the relative height between the highest peak and the lowest trough along a surface profile over a... The surface profile was obtained by means of a surface roughness gage with a stylus whose point...
  • Surface Finish Gage Indexes And Measures Multiple Parts
    Providence, RI - A new surface finish gage now available from Mahr Federal is custom designed to index and measure multiple small parts, such as gears, fuel injector components, or inner and outer bearing components. ...instrument, and supports most common DIN, ISO, ASME and SEP profile parameters, including Ra, Rz, Rmax , RPc.
  • Static and Cyclic Direct Shear Tests on Carbonate Sands
    The surfaces of the metal blocks were finished to a specified roughness. The surface roughness ( Rmax ) is defined as the relative height between the highest peak and low- est trough along the profile over a special gauge length L, which depends on the Ds0 particle size of the soil.