GDS Electro-Mechanical Dynamic Cyclic Simple Shear

Product Code : EMDCSS

The GDS Electromechanical Dynamic Cyclic Simple Shear Device (EMDCSS) is for simple shear testing, which can be upgraded to direct shear. It is capable of carrying out dynamic cyclic tests from small strain (0.005% shear strain amplitude) to large strain (10% shear strain amplitude), as well as extremely accurate quasi-static testing. This is the choice for a no-compromise simple shear machine with the greatest range of testing capability. The perfect choice for advanced commercial testing or academic research.
Key features Benefits to the user
Teflon coated low friction retaining rings: A cylindrical soil specimen is laterally confined by teflon coated low friction retaining rings, ensuring a constant cross sectional area (or K-zero conditions).
Electro-mechanical actuators that give superior performance, reduce space and provide cost savings: Electro-mechanical actuators can carry out tests up to +/-1mm at 5Hz, with greater accuracies than comparable pneumatic actuators. Mains powered means no external noisy power pack is required and as opposed to pneumatic systems electro-mechanical systems draw only the power that is required.
Active height control: Therefore constant volume conditions are enforced i.e Simple Shear. No manual intervention between stages plus little or no effects of vertical compliance.
Axial & Shear linear guidance provided by super-stiff crossed-roller bearings: 200mm bearing length not only provides stability while ensuring minimal rotation of the topcap during shearing, allowing testing to be simple shear rather than rotational motion, but also provides high load capacity with low friction with accurate linear guidance.
GDS shear loadcell: Designed so that shear force is measured in front of the linear guides, as such the shear force measurement does not include frictional errors.

1200mm (H) x 500mm (L) X 770mm

Displacement Range

axial = +/- 25mm, shear = +/- 15mm: Accuracy = <0.1% FSO (In practice, axial range is +/-50mm to aid sample placement, however measured stroke is +/- 25mm, and shear stroke is supplied as standard with a high accuracy +/-10mm LVDT).

Displacement Resolution

24bit (i.e. +/- 20mm = <0.6μm, +/- 15mm = +/- <0.5μm, +/- 2.5mm = <0.1μm)

Load Range (kN)

5, 10

Operating Frequency (Hz)

0 to 5Hz


240V or 110V 50/60Hz 1 ph

Sample Sizes

Direct: 60mm sq., 63.5mm round. Simple: 50, 63.5, 66, 70, 100 and 150mm

Weight Approx (kg)


  • P and S wave measurements with Bender Element system.
  • Direct shear

Alternative Direct Simple Shear Test Products or just Direct Shear Test Equipment