Shearmatic – Automatic Shear Testing Machine
Soil Mechanics Testing Equipment
Standards
ASTM D3080, BS 1377:7, AASHTO T236, CEN-ISO/TS 17892-10, NF P94-071
This microprocessor-based advanced model is a stand-alone machine, driven by a high-resolution stepper motor with epicyclical reduction gear with reduced backlash. Incorporate a pneumatic closed loop system for the automatic application of the axial pressure by a high-performance pressure regulator, with the main advantage of eliminating the manual loading of the dead weights. Excellent and high-resistance techno-polymeric material has been adopted for the carriage of the shear box. It offers excellent resistance to corrosion, wear, and tear and is resistant to all chemicals found in a soil specimen. The carriage is lightweight and easy to clean.
The microprocessor system reads and processes the force, axial pressure, and displacement readings, and manages the motor, the pressure valve, the safety system, and the test steps through the closed loop system. Scratchproof membrane keyboard with large monochromatic graphic display. The machine is supplied complete with the following electronic transducers:
- ±5 kN capacity load cell, bi-directional type (compression and tension), nominal sensitivity 2mV/V, accuracy ±0.003%
- 10 mm displacement transducer, 1 kOhm nominal resistance, ±0.25% linearity, 0.002 mm repeatability
- 25 mm displacement transducer, 1 kOhm nominal resistance, ±0.25% linearity, 0.002 mm repeatability
- 1000 kPa pressure transducer, 0.1 kPa accuracy, nominal sensitivity 2mV/V
The Shear box assemblies have to be selected and ordered separately. See accessories. The machine requires compressed air, 10 bar max. Pressure. For a suitable Air compressor, laboratory model, see accessories. A more detailed description, a Schematic layout, and an example of displays are given in the Widening. The shear testing can also be performed with other traditional machines such as a Digital shear testing machine, a Digital shear testing machine with data acquisition, a large shear testing machine for 300x300 square samples, and a Bromhead ring shear apparatus.
Main Features
- Automatic pneumatic application of pre-set consolidation steps (up to 50)
- Automatic test management from consolidation to failure: the operator is only requested to remove the clamping screws of the shear box
- No dead weights and lever arms are requested
- Vertical force was positively applied to the shear box without friction
- The straight connection between the shear box, drive unit, and load cell for the axial transmission of the horizontal force along the shearing plane, instead of the classic "swan neck"
- High-resistance techno-polymeric carriage
- Easy and immediate setup of the test parameters via the large digital graphic display
- Possibility to set different speeds and travel (forward and reverse) in the residual shear tests
- Each single step of axial force can be applied instantaneously or by means of a linear ramp in a pre-set time interval
- Different and independent data recording for consolidation and failure
- Different protocols of data downloading via RS 232 serial port
Specifications
| NG-Shearmatic | |
|---|---|
| Motor | High-accuracy stepper motor 1/10000 resolution |
| Test Speed | Infinitely variable from 0.00001 to 11.00000 mm/min |
| Maximum Horizontal Force | 5 kN |
| Maximum Vertical Force | 8 kN = 800 kPA on 100x100 mm square specimens |
| Maximum Shear Cycles | 10 (forward and reverse) |
| Maximum Travel | 20 mm |
| Maximum Air Pressure Supply | 10 bar |
| Maximum Working Air Pressure | 8 bar |
| PC Connection | RS 232 Serial Port |
| Overall Dimensions | 97 x 42 x 42 cm |
| Approximate Weight | 100 kg |
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The microprocessor control system, therefore, allows the machine to work as an automatic stand-alone unit: the test measurements (force and displacements) a re directly displayed and stored in memory according to pre-set recording modes. The PC is only temporary required to download the test data via the RS 232 port once the test is completed. The data can be processed by the Direct and residual shear Geo-Analysis templates. See accessories.
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