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Direct Simple Shear

The Geotechnical Laboratory at Virginia has six DigiShear™ Automated Direct Simple Shear Testing Systems manufactured by GEOTAC.  The DigiShear Direct Simple Shear Device is a computer controlled device that automates testing. It is a complete system incorporating digital actuators for both vertical and horizontal loading, four channels of 22 bit data acquisition, and all necessary sensors. Testing can be performed under closed loop control of deformation, load, or pressure. Specimens can be loaded and sheared in a variety of modes, including constant rate of deformation, constant rate of loading, or application of a series of step loads.  The DigiShear™ system automates the consolidation as well as the shearing portion of the test.

The DigiShear™ system software is a Windows based true 32 bit program with a user friendly graphical interface. The system is not restricted to standard testing. A manual option allows independent control of the apparatus for performing nonstandard testing. The right side of the screen is also used for viewing plots of real-time data. These enable an operator to make critical decisions concerning the course of testing before it is too late.


  • Load capacity vertical: 2000 pounds
  • Load capacity horizontal: 1000 pounds
  • Speed 0.000002 to 0.2 in/min
  • Horizontal Travel 1 in
  • Specimen Rings 2.652 in diameter

For more information about this device please click here.

For cyclic direct simple shear please click here.]