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GDS Instruments (A division of Global Digital Systems Ltd)
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  5. GDS - Model GDSHCA - Small-Strain ...

GDS - Model GDSHCA -Small-Strain Hollow Cylinder Apparatus

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The GDS Hollow Cylinder Apparatus (HCA) allows for rotational displacement and torque to be applied to a hollow cylindrical specimen of soil. Using this device it is possible to control the magnitude and direction of the three principal stresses.

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Studies can for example be made of the following:

  • The anisotropy of soil samples.
  • The effects of principal stress rotation.
  • The effects of intermediate principal stress.

Two versions of the HCA are available, a dynamic (HCA d) and a lower cost "static" (HCA s) version.     

  • Key features : Benefits to the user
  • Both systems exhibit high levels of axial and torsional stiffness coupled with the minimum amount of “backlash” and friction: : Resulting in both machines being well suited for small strain testing right through to high load and strain testing.
  • Flexibility in the capacity of the system: : Specimen size, load, pressures can be chosen to ensure the system is created specifically to suit the testing required and the budget.
  • Balanced ram: : Allows a static pressure controller to be used for cell pressures with no significant fluctuations of cell pressure during dynamic tests.
  • Submersible, interchangeable combined axial / torque loadcell: : Measures axial load/torque with no errors introduced due to friction on the loading ram.
  • Cell top lift frame: : For ease of use when lifting the cell top, comes as standard.
  • Axial Displacement Encoder : <1μm
  • Axial Load : <0.3N (For 10kN system)
  • Axial/Torque Force Range : 2Hz/10kN/100Nm, 5Hz/10kN/100Nm, 5Hz/10kN/200Nm
  • Dimensions : 700 X 700 X 1000mm (cell de-mounted), 1450mm (cell mounted), 2350mm with cell top lifting frame.
  • Load Range (kN) : 10
  • Operating Frequency (Hz) : 2 or 5
  • Pressure Range (MPa) : 2
  • Sample Sizes : 100mm OD/ 60mm ID
  • Weight Approx (kg) : 500