Direct Shear Test Machine

The tests performed using Direct Shear Test Machine covers the determination of consolidated drained shear strength of a soil material in direct shear. TS-2060 Automatic Direct / Residual Shear Test Machine is motorised and floor mounted. Supplied with carriage assembly load hanger and integral 9:1, 10:1 and 11:1 lever loading device as standard. The beam loading device which is used to amplify the vertical load on the shear box assembly can receive up to 50 kg of weight. The total load on the specimen can reach up to 5 kN (5000 N).

The direct shear machine accepts 60 mm square, 100 mm square, 60 mm dia. round, 100 mm dia. round and 2.5 inc. dia. round shear box assemblies. All shear box assemblies are designed to contain water that surrounds the specimen. The Assemblies consist of a shear box with a rigid wall square or round hole complete with a vertical loading pad grooved back face, a grooved retaining plate, 2 pcs. porous plates, 2 pcs. plane grids and 2 pcs. perforated grids.

The direct shear machine is driven by high resolution servo-motor and gear box assembly. Speed range is fully stepless variable over the range 0.00001 to 9.99999 mm/min for both directions (forward and reverse). After test the reverse speed is 10 mm/ min.). 5 kN load cell is used for load measurement. 10 x 0.001 mm and 25 x 0.001 mm sensitivity linear potentiometric transducers are used for vertical and horizontal displacement measurements respectively. Displacement limits are controlled by a limit switch.

Shear Box Assembly, Slotted Weight Set and other optional accessories including specimens cutter and extrusion dolly should be ordered separately.

Standards

• BS 1377:7
• ASTM D3080
• AASHTO T236
• CEN-ISO/TS 17892-10

BC 100 Unit

BC 100 UNIT The BC100 TFT Graphic Display Data Acquisition and Control Unit is designed to control the machine and processing of data from load cells and displacement transducers (fitted to the frame of the machine or additional frames).

All the operations of Data Acquisition and Controls System BC 100 TFT are controlled from the front panel which consists of a 800 x 480 pixel 65000 colour resistive touch screen display and function keys. Three analogue channels for load cells and displacement transducers.

The BC 100 TFT has easy to use menu options. It displays all menu option listings simultaneously, allowing the operator to access the required option quickly to activate that option or enter a numeric value to set the test parameters. The BC 100 TFT digital graphic display allows real time Load vs. Displacement or Stress vs. Displacement graph.

The advanced functions for data base management provide an easy navigation of all saved data. The test results certificate includes all descriptive information. Therefore, test parameters can be set and details about the test carried out such as customer details, test type, specimen type, user info and other information required can be entered and printed out as well as test reports and graphs. Also, all minor revisions can be implemented upon request. The Software calculates both the maximum and resilient shear stress. After three runs, the software calculates the cohesion value ‘c’ and shear resistance angle ‘φ’ by using the best straight line fit.

Key Features

• Consolidation
• 25 pairs of time-vertical displacement values are written to memory
• The memory is configured as saving a maximum of 1000 tests
• The vertical displacement value can be tared prior to recording
• The analogical channel reading vertical displacement has 260000 points effective resolution
• The memory can be exported to PC software
• Shear

User can select 3 different test types:

• The machine run with the given speed to the direction of shear and stop when the load decreases
• The machine run with the given speed to the direction of shear and also opposite direction until the given horizontal displacement
• The machine run with the given speed to the direction of shear and also opposite direction until the given horizontal displacement and returns to home position with same speed
• The screen shows continuously load, shear stress and horizontal displacement
• CPU card with 32-bit ARM RISC architecture
• Permanent storage capacity up to 10000 test results
• 3 analog channels for load cell, vertical displacement and horizontal displacement transducer (one for each)
• 1/256000 points resolution per channel
• 10 data per second sample rate for each channel
• Ethernet connecting for computer interface
• 800 x 480 resolution 65535 color TFT-LCD industrial touchscreen
• 4 main function keys
• Multi-language support
• 3 different unit system selection; kN, Ton and lb
• Real-time clock and date
• Test result visualisation and memory management interface
• Remote connection through ethernet and bluetooth.
• USB flash disc for importing test results and for firmware
• USB printer support for inkjet and laser printers (ask for compatible models)
• Camera support for real-time video recording during test (ask for compatible models)
• Free of charge PC software for the test control and advanced report generation

Data Acquisition and Software

The Direct and Residual shear software is developed according to ASTM D3080, BS 1377:7 and AASHTO T 236 standards to use with TS-2060 Machine. Direct residual and shear software consist of two sections. First section is used for the consolidation of the sample prior to shear.

The software is capable of making three different types of test. The first type of the test is to move the machine till a load failure happens. On the second type of test the user can set a horizontal displacement and the test will continue until the machine reaches set value. On the last type of test, the machine can be configured as going to a set horizontal displacement value and return to home position. And also the number of cycles, forward/reverse speeds and displacement for the measurement of residual shear may also be programmed. The software supports 5 different normal load values in order to calculate cohesion values. Prior to the test normal load value must be entered to the software. The normal stress value would be calculated in respect to normal load and sample size automatically. The software supports both square type and round type samples. For both samples the area might be calculated by directly or by using the net area caused by horizontal displacement. The net area method is especially important for critical samples on academic literature. When the test is completed max and resilient stress values are recorded.

The normal load versus max stress pair is used for calculating the cohesion value and angle. At least 3 loading with different normal loads are required for this property. One can set test speed, axis values etc through the setup of the software. The results can be submitted as a report or can be exported to Microsoft Excel TM for advanced re-analyse procedures.

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