SSH-25 Simple Shear System

  • Dynamic and static simple shear apparatus capable of applying cyclic loads up to 5 Hz (30 mm./sec max. velocity)
  • Closed-loop servo-control of double-acting (push/pull) 18 kN shear load actuator with ±25 mm. stroke & 18 kN normal load capacity with 50 mm. stroke
  • 100 mm. (4″) diameter standard specimen size. Optional 70 mm. (2.8”) diameter specimen platens and Ko rings available
  • Normal load reaction support mounted on sliding bearings to minimize horizontal friction
  • Software for the automatic performance of simple shear tests with real-time graphical display of test progress
  • Load frame, signal conditioning unit, and hydraulic pump mounted to a moveable cart
  • Optional accessories and software to perform direct shear tests


This system features a closed-loop digital servo-control of the shear and normal loads for test automation. Stresses or strains for both the shear and normal actuators can be prescribed to automatically perform conventional simple shear tests as well as cycle dynamic tests, such as liquefaction or cyclic strength.

A high-precision vertical deformation sensor is included to perform liquefaction tests on dry sands by specifying a zero vertical deformation during cyclic shear loads. The electrohydraulic loading system for both the normal and shear load actuators can apply or maintain the prescribed loads or deformations with very small compliance.


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