HCA-100 Dynamic Hollow Cylinder Testing System

  • Designed to study inherent or induced soil anisotropy
  • Complete “turn-key” system with closed-loop digital servo control
  • ±225 N-m torsional load capacity
  • ±25 kN axial load capacity
  • 25 Hz maximum single axis loading frequency, 10 Hz maximum synchronized loading frequency
  • Confining, back/pore, and internal pressure servo control up to 2,000 kPa
  • Angular displacement sensor with a deflection range of ±25° to measure large shear strains (±40° optional)
  • Non-contacting deformation sensors with a ±2.5 mm range to detect small shear strains
  • Standard systems to test 100 mm outside diameter & 63.5 mm inside diameter (18 mm wall thickness)
  • Systems also available to test 100 mm OD 50 mm ID, 150 mm OD and 75 mm ID, 200 mm OD 100 mm ID, 300 mm OD 150 mm ID
  • Optional unsaturated soils testing system package also available
  • Internal high-speed torque motor for resonant column testing, ultrasonic platens, and temperature controller options also available
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Description

The GCTS Hollow Cylinder Testing Systems are capable of performing advanced tests on large, hollow soil specimens, including liquefaction, plane strain, simple shear, dynamic shear strength, and shear modulus. These systems are able to simulate most field stress and strain paths and can perform both static and dynamic tests. By providing digital servo control of axial load, torque, confining pressure, internal pressure, and back pressure, the GCTS Hollow Cylinder Testing Systems are capable of subjecting the soil specimen to any stress state and follow any stress/strain path.

The included software automatically controls all five axes and calculates more than 20 HCA test parameters in real-time that can be used as control feedback to prescribe an infinite number of stress/strain paths. This includes the principal stress angle (α), allowing the system to easily prescribe the rate and magnitude of the σ1 rotation.

The system manages all the instrumentation and continuously monitors sensor outputs to accurately account for uplift pressures acting on the loading piston, area changes, deformation and volume change sensor setup, re-positioning, and more. It also advises the user on how to perform testing tasks and reminds the user of important steps in the test, which helps to minimize the learning time and ensure laboratory personnel can conduct tests with minimal error.

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