Bromhead Motorised Ring Shear System

The VJ Tech Bromhead Motorised Ring Shear is a torsional ring shear apparatus, which produces accurate and repeatable test results to determine the residual shear strength of cohesive soils under drained conditions.

The Instrument is supplied as a tabletop unit for stability and a normal load is applied to the annular ring sample through a stepper motor whilst rotational shear displacement is applied to the sample by a separate stepper motor, through a fixed ratio gearbox. Shear stress is determined by a pair of load cells which provide accurate measurement of the top cap’s resistance to the rotation.

This type of Bromhead Motorised Ring Shear apparatus is widely used to determine the residual strength of soils as well as the interface residual friction angles between soils and piles. The ring-shaped soil specimens have a height of 5 mm. Tests are easily conducted; specimens are simple to form, and both soil-soil and soil-steel interface tests can be carried out with our Advanced csRING-SSI software module.

  • Bromhead type Ring Shear apparatus
  • USB or Ethernet Interface for computer control
  • 7” touchscreen display and control panel
  • Motorised actuation of normal stress using a stepper motor
  • Motorised actuation of torsional stress using a stepper motor
  • Load cells are used for the measurements of Vertical and shear stress
  • Partial or complete test automation using Clisp Studio Ring shear software
  • On board data logging (16 GB standard)
  • Able to store thousands of Tests, each with thousands of data points (raw data)
  • Data export via USB (in *.csv format)
  • High speed ARM processor
  • High speed sensor data conversion (24 bit up to 5000 sample/sec)
  • Build-in live data and graphs
  • Non-volatile Memory for sensitive data
Sample Size
100 mm (OD) x 70 mm (ID) x 5 mm (h)
Maximum Normal Stress
1000 kPa
Maximum Shear Stress
750 kPa
Dimensions (W x D x H)
1340 mm x 380 mm x 1400 mm
Electrical Requirement
90 - 240 Volts, 50/60 Hz, Single Phase
Test Performed
  • Residual shear strength tests
  • Interface (Soil – Steel) shear tests
Standards
British
BS1377-7 : 1990 BS1377-2: 2022
European
BS EN ISO 17892-10 : 2018
American
ASTM D6467-13
Others
Imperial College Pile (ICP) Testing method
Item
Description
Soil-Steel Interface Discs

Additional Stainless Steel Interface Discs (Roughness range 6.3 - 12.5 Ra). Can be purchase in alternative grades of Stainless Steel.

Upgrade Options *
ICP Testing Method (Soil-Steel Interface testing)
*Upgrade options will require additional hardware. Contact us for more information.
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