Cyclic Ring Shear Apparatus
BORMHEAD TYPE - DRAINED
This high-end cyclic ring shear test device features a robust and stiff construction combined with high-quality mechanical and electronic components, determining the drained residual strength of continuously sheared soils.
It includes two separate advanced cyclic force actuators which, in combination with other components, produce repeatable test results. The excellent quality makes it suitable for research as well as standard test applications. The vertical and torsional loads are generated by independent and separate electromechanical force actuators, allowing for independent control of the normal axis and shear axis in displacement (strain or velocity) mode, as well as load control.
The wide column spacing enables the accommodation of large shear boxes with sample sizes up to 200 mm O.D. and 150 mm I.D. The frame has high stiffness to reduce deflection and vibrations, which could influence the accuracy of measurements during repeated loading tests.
The advantage of the ring shear device over other Shear testing devices, such as the direct shear test, is its ability to accommodate very long and almost unlimited shear displacement (continuous shear) while maintaining a constant area throughout the whole test.
- Features
- Specifications
- Software
- Standards
- Applications
- Electromechanical precision cyclic servomotor drive for closed-loop control of axial stress, strain and position
- True continuous shearing rate without inherent backlash
- High stiffness rigid load frame
- Stainless steel Bromhead Ring Shear box for different sample sizes
- Residual ring shear test under drained condition
- Closed loop controlled axial displacement
- Closed loop controlled normal and shear stresses
- Performs a constant volume test
- High speed dynamic controller (2,5 kHz or 10 kHz) for monitoring of measured values and closed loop control e.g. load, displacement, position
- 2 number of rigid bars built into system to maintain rigidity of machine
- ICP testing method for interface testings
- Parallel guided load piston without influence of tilting or friction
- Real-time data and graph display
- Ethernet Port for fast data transferring to PC
- Safety functions to prevent overload and overtravel
- Direct operation of the device by a PC with controlling
| Load type |
Electromechanical |
| Normal force |
5kN/ 10kN / 20kN |
| Shear force (Torque) | 420 N-m / 1100 N-m |
| Frequency |
1 Hz/ 5Hz / 10Hz |
| Resolution of shear stress: | <0.01 kPa |
| Resolution of Axial stress: |
<0.01 kPa |
| Accuracy class |
0.1% |
| Sample Sizes |
Outer/inner/height (mm) Ø100 / Ø 50 / 20 Ø200 / Ø 100 / 20 |
| Computer Interface |
Ethernet |
GEOsys is designed for closed-loop controlled static & Dynamic tests for all test applications in material testing, such as stress-controlled, strain-controlled, all stress paths, loops, any kind of waveforms like sine, rectangle, triangle, and predefined wavesIt is controlling and data acquisition software and also has different modules to run tests according to ASTM or BS or other standards. Please note that some tests listed below will require optional hardware. Depends on the requirement of the customer one or several modules would be delivered with main software, such as:
- Data Acquisition, processing and device management (DPD) Module
- Consolidation Module
- Static Shear Stage Module
- Constant Normal Stiffness Test (CNS)
- Residual Shear Test
- ICP Test Module
- Dynamic Shear Stage Module(Available for Cyclic Ring Shear device)
- Advanced loading Module
- Temperature Controlled Ring Shear Testing (Available for THM Ring Shear Test Device)
- Unsaturated Test Module(Available for unsaturated Ring Shear Test Device)
- ASTM-D6467-13
- ASTM-D7608-10
- BS 1377-7
Standard Test Method for Torsional Ring Shear Test to Determine Drained Residual Shear Strength of Cohesive Soils
Standard Test Method for Torsional Ring Shear Test to Determine Drained Fully Softened Shear Strength and Nonlinear Strength Envelope of Cohesive Soils
Methods of test for Soils for civil engineering purposes - Part 7: Shear strength tests (total stress)
- Detailed information will follow soon
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