Direct Shear Test Machine

Standards: ASTM D3080; BS 1377:7; AASHTO T236, CEN-ISO/TS 17892-10

The test measures the consolidated drained shear strength of a soil material in direct shear. Automatic Direct Shear Test Machine is motorized with servo motor and measuring sensors are electronically connected to a digital readout unit to get accurate readings.  Supplied with carriage assembly load hanger and integral 9:1, 10:1 and 11:1 lever loading device as standard. The loading arm which is used to amplify the vertical load on the shear box assembly can receive up to 50 kg of weight. The total load on the specimen can reach up to 5 kN.

The shear machine is driven by high resolution servomotor and gear box assembly. Speed range is fully steeples variable over the range 0.00001 to 9.9999 mm/min. 5 kN load cell is used for load measurement. 10 x 0.002 mm and 25 x 0.001 mm sensitivity displacement sensors are used for vertical and horizontal displacement measurements respectively. Displacement limits are controlled by limit switch.

The machine shear box tests on 60 mm and 100 mm square, ∅ 60 mm round, ∅ 100 mm roundand ∅ 2,5” round samples. All Shear box assemblies can contain water that surrounds the specimen. The Assemblies consist of a shear box with a rigid wall square, complete with a Vertical Loading Pad grooved back face, a Grooved Retaining Plate, 2 pieces Porous Plates, 1 piece Plane Grid, 2 pieces Perforated Grids and software. Direct Shear Test Machine Supplied with 50 kg Slotted Weight Set.

Shear Box Assembly, Specimen cutter and Extrusion Dolly should be ordered separately depending on the sample size.

Touch Screen Graphic Display Automatic Control Unit
 
Real time Load vs. Displacement or Stress vs. Displacement graphs can be seen on the Graphic Display.
 
The Software calculates both the maximum and resilient shear stress.
 
After minimum three tests, the software calculates the cohesion value “c” and shear resistance angle”φ” by using the best straight line fit.