Automatic Direct Residual Shear Machine

The Automatic Direct Residual Shear Machine is capable of performing the consolidation and shear phases of a standard direct and residual shear test under fully automatic control.

The system consists of a computer-controlled unit that uses micro-stepper motors to apply vertical and horizontal loads to the soil sample. The system is capable of automatically performing a 32-phase consolidation process.

The horizontal shear can be applied at a specified strain rate or a specified horizontal force change rate, or at a specified set of force steps of a specified duration.

The system is capable of displaying the current status of a test and graphically representing the progress of the test in real time. The system includes the ability for the operator to change the process and test conditions at any stage of the test.

Features
• Detection of shear values ​​by cell and electronic sensors. Continuously adjustable speed from 0.00001 to 15.0000 mm/min.
• Maximum shear load: 5000 N possible over the entire speed range.
• Shear speed: 0.00001 to 15.0000 mm/min, continuously adjustable
• Display of speed and displacement with 0.00001 mm resolution.
• Full closed-loop control motor
• Direct vertical load possible, or with a lever arm ratio of 10:1
• Maximum vertical load: 500N; lever arm: 5500N
• Unlimited memory storage with: 2 USB ports, 1 SD card.
• Different menu languages ​​can be selected via the device via language support (Turkish, English, French, Spanish and Russian).

Supplied complete with:
• 50 kg weight set, lever arm gear reduction system, 10:1 ratio (eg: able to subject the sample to pressures of 1 to 4 bars for 60 or 100 mm cell)
• 3 KN torque ring with electrical safety stop device, supplied with calibration certificate (torque rings of different capacities up to 5000N available on request)
• 25mm x 0.01mm horizontal displacement sensor
• 10mm vertical displacement sensor

The shear box assembly and other optional accessories including sample cutter and extrusion can be ordered separately.

Technicial Features for TCM200 Touch Screen
• Color TFT touch display supports 16M colors and supports 800x480 pixel screen resolution
• 3 pcs universal analog input sockets (ADC)
• Each analog input with 18 bit precision (1/256000)
• 1 replacement analog input
• Total of 4 analog high-precision measuring capacities
• 2 analog output sockets (DAC)
• PULSE / DIR outputs (PULSE / DIR / ENA) to control the servo and stepper motor drives.
• Digital outputs for general purpose (can pull relays and control different electrical units)
• Digital inputs for general purpose (receives and evaluates input signals like limit contacts from the environment)
• Potentiometer input (reference signal input for calibration and remote control)
• USB communication signal output (communicates with computers)
• Connects to local networks and the Internet with Ethernet 10/100 network connection output (optional)
• Connects to portable devices via Bluetooth wireless connection (optional)
• 500 test results can be stored in internal memory
• Due to the SD (memory) card connection, a large number of test results can be stored in the device memory (40,000 test results).
• In addition, the results can be taken from the device memory and transferred to the computer as an Excel table. (Optional)
• Resistive touch screen allows easy operation of device functions by touching the screen
• Sensor modules are compatible with loadcell (load cell), pressure sensor (4-20 / 0-20 mA), potentiometric distance sensors, strain washers, thermocouples and all kinds of mV output sensors.
• Provides precise calibration with multi-point calibration (up to 10 points)
• Setting and calibration menus are password protected and prevent unauthorized use
• Allows testing with a computer, tablet, smartphone or on the touch screen panel.
• There are many test sample information screens and test methods in the device memory and tests can be performed easily
• Different menu languages can be selected via the device via language support (Turkish, English, French, Spanish and Russian)
• Speed control algorithm is closed loop PID control and all parameters can be adjusted on user side.
• The device can switch between one-touch load and deformation control modes.
• The graphical field that visualizes the test results on the screen has the ability to change the scale automatically and automatically adjusts the optimal scale as the values change
• Firmware updates can be made via USB input. In addition, via the computer allows remote or internet update.

Data Acquisition and PC Software
The digital graphic display shows real-time load-displacement or stress-displacement graphs. The software calculates both the maximum shear stress and the residual shear stress.

After at least three tests, the software calculates the cohesion value “c” and the shear resistance angle “φ” using the best-fit tangent to the Mohr circles.