Dynamic Hollow Cylinder Machine
HCA-100 Dynamic Hollow Cylinder System

The advanced engineering of the GCTS HCA-100 Dynamic Hollow Cylinder System allows it to perform a multitude of tests, including "true triaxial" tests. With intuitive software and great technical support, testing experience becomes more efficient and enjoyable.


  • Closed-loop digital servo control.
  • ±225 Nm torsional loads & up to ±100 kN axial loads at up to 50 Hz.
  • Confining, back/pore, and internal pressure servo control up to 1,000 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.
  • Complete "turn-key" system.


By providing digital servo control of axial load, torque, confining pressure, internal pressure, and back pressure, the GCTS Dynamic Hollow Cylinder Testing System (HCA-100) is capable of subjecting the soil specimen to any stress state and follow any stress/strain path.


The HCA-100 is capable of simulating most field stress/strain path tests (static or dynamic), including plane strain, simple shear, and small shear strains. Other possible tests include: measurement of dynamic shear strength & deformation, liquefaction potential, shear modulus and damping ratio. The system is versatile in allowing the user to design custom procedures with operating frequencies of up to 30 Hz.


The included software automatically calculates up to 28 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.


  • 25 kN axial load capacity
  • 225 N-m torsional load capacity
  • 25 Hz maximum frequency
  • 25° maximum rotation
  • 100 mm maximum specimen diameter


Please contact GCTS for full specifications.