GDS SMALL-STRAIN HOLLOW CYLINDER APPARATUS
Product Code : GDSHCA
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. Studies can for example be made of the following:
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The anisotropy of soil samples.
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The effects of principal stress rotation.
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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.
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Key features |
Benefits to the user |
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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. |
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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. |
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Balanced ram: |
Allows a static pressure controller to be used for cell pressures with no significant fluctuations of cell pressure during dynamic tests. |
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Submersible, interchangeable combined axial / torque loadcell: |
Measures axial load/torque with no errors introduced due to friction on the loading ram. |
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Cell top lift frame: |
For ease of use when lifting the cell top, comes as standard. |
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Axial Displacement Encoder |
<1μm
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Axial Load |
<0.3N (For 10kN system)
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Axial/Torque Force Range |
10kN/100Nm, 10kN/200Nm, 12kN/200Nm, 15kN/400Nm
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Dimensions |
700 X 700 X 1000mm (cell de-mounted), 1450mm (cell mounted), 2350mm with cell top lifting frame.
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Load Range (kN) |
10, 12 or 15
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Operating Frequency (Hz) |
2 or 5
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Pressure Range (MPa) |
1, 2
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Sample Sizes |
100/60/200 or 200/160/400 (OD, ID, height)
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Weight Approx (kg) |
500
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Vertical bender.
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Both systems can be provided with the same optional sample sizes, transducers, celltop counter balanced lift.
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Optional large cell for 200mm samples to provide additional space around sample for local instrumentation.
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Optional transducer for measuring inner sample strain.
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Optional Local strain transducers:
Advanced HCA LoadingAxial CompressionAxial ExtensionAxial or Radial DeformationB CheckConsolidated Drained (CD) TriaxialConsolidated Undrained (CU) TriaxialConsolidation (Triaxial)Constant Head PermeabilityConstant Rate of Flow PermeabilityConstant rate of Loading (CRL) ConsolidationConstant rate of strain (CRS) ConsolidationContinuous Infinite Volume Flow (either target or ramp)Cyclic Testing, SlowCyclic loading of samples under either load or strainDynamic Cyclic Axial Stress CapabilityDynamic HCA LoadingK0 (K-Zero)Load Control (Dynamic)Load Control (Static)Local Strain MeasurementMaximum Shear modulusMulti-stage TestingPore Water Volume ChangeQuasi-Static (low speed/creep) TestsRAMP and CYCLE pressure or volume change (Saturation Ramp)Slow Speed (less than 2Hz) Torsional Shear)Slow Speed (up to 2Hz) Torsional Shear (TS) testingStatic DisplacementStatic LoadStepped LoadingStress PathsUnconsolidation Undrained (UU) TriaxialUser defined waveforms
