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Advanced Cyclic Direct Simple Shear Test System

What is the Cyclic Direct Simple Shear test?

Advanced Cyclic DSS Data Sheet
Sample Geotechnical Report

The Advanced Cyclic Direct Simple Shear (ACDSS) system is designed to offer superior performance, accuracy and results for academic researchers and commercial testing laboratories. This state-of-the-art machine allows users to measure cyclic strength, liquefaction characteristics or cyclic properties of soils such as Modulus and Damping. Researchers can also upload stress ratio or strain time history files (e.g. earthquake motion) for analysis.

Cyclic direct simple shear testing requires the proper combination of frame stiffness and very precise load and volume control to produce reliable data. The ACDSS system is built to excel in these aspects. We've also incorporated technology and software features to ensure a broad range of user needs are met in terms of both ease of use and sophisticated options.

Applicable Test Standards

  • ASTM D6528, D8296


  • Extremely rigid frame design
  • Large diameter axial loading piston and precision crafted anti-rocking system
  • Passive or active height control
  • Stress or strain controlled loading
  • User can apply independent sinusoidal stress or strain on X & Y axis
  • Apply irregular stress ratio and strain time history (e.g. earthquake motion)
  • Capable of conducting static direct simple shear tests in drained (constant load) and undrained (constant volume) condition with or without shear bias
  • Supports linear encoders for precise and noise free displacement measurement
  • Faster sampling rates, up to 1000 Hz
  • Software configurable excitation voltage for sensors
  • Remote network access for real-time monitoring and control
  • Software generates full report of the test or raw data (.CSV export)
  • Upgradeable to perform bidirectional cyclic direct simple shear testing


  • Horizontal loading capacity: 4.5 kN (1000 lbf) standard
  • Vertical loading capacity: 11 kN (2500 lbf) standard
  • Horizontal displacement: cyclic peak to peak strain of up to 10%; monotonic strain of up to 25%
  • Vertical displacement: 50 mm (2.0 in)
  • Specimen size: 2.5 in (63.5 mm) diameter standard. Also available: 2.0 in (50 mm) and 4.0 (101 mm) diameter

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