Dynamic Triaxial

Brand : Controls – Italia

Standard : ASTM D5311

Main Features :

• Capability to perform Static (effective stress and stress path), Dynamic and Unsaturated soil triaxial tests
• Three axis closed loop control for axial load or displacement, cell and back pressure
• Automatic compensation of cell/back pressure during dynamic stage
• Nominal operating frequency up to 10 Hz (depending on the test condition)
• Complete test automation of all test stages using an high sensitivity closed loop P.I.D. feedback
• Two dynamic load/displacement options:
  – Up to ±25 mm with ±5 kN double-effect actuator
  – Up to ±15 mm with ±14 kN double-effect actuator
• Available upgrade for Bender element testing and Local strain measurement
• Standard and user defined wave shapes also derived from in situ measurements (from violent earthquakes to sedate ocean waves)
• Test set-up by unique programmable Multi stage test procedure: during the test run, acces to all controls to expand and modify the stages according to the response of the soil specimen
• Manual and automatic Emergency air shut-off function

General Descriptions :

DYNATRIAX apparatus is a computer controlled servo-pneumatic systems, designed to perform the static and dynamic stages of a triaxial test. The systems manage three closed loop axis:

1. Vertical load/displacement:
   -up to ± 25 mm (± 5 kN double-effect actuator)
   -up to ± 15 mm (± 14 kN double-effect actuator)
2. Cell pressure up to 1000 kPa
3. Back pressure up to 1000 kPa

The base system includes:

Triaxial load frame – Tritech 50 or Tritech 100
The Tritech digital loading frames feature a microprocessor controlled drive system, specifically designed to perform both static or dynamic tests.

• Static load capacity: 50 or 100 kN
• Static vertical displacement: up to 100 mm (machine travel)

Actuator
The double acting pneumatic actuators are digitally controlled and includes an integrated LVDT displacement transducer to control the position and the displacement of the piston during the test.

• Dynamic load capacity: ±5 kN or ±14 kN
• Dynamic vertical displacement ±25 or ±15 mm
• Nominal operating frequency: up to 10 Hz (depending on test conditions)
• Maximum servo-valve frequency: 70 Hz
• Min. air supply: 800 kPa

Data Acquisition, process & control system 
The unit manages the three closed loop axis (vertical load/displacement, cell and back pressure) with a control loop rate of 10 kHz. It provides the automatic control of the system and drives the servo-valve units of the three axis and two on/off valves, one connected to the drainage line and one connected to the air main supply of the triaxial cell. The CDC communicates with the PC through an Ethernet communication link (1 Gbit/s). The CDC has sixteen transducer input channels using 16 bit ADC.

PID control
An extremely efficient algorithm with larger gain ranges gives enhanced sensitivity, making it easier to tune the system and achieving a more accurate waveshape.
New features include manual and automatic amplitude controls which compensate for small changes that may occur in the system during cycling, ensuring that the required peak and valley levels are consistently maintained.
The improved tuning panel, with its more user-friendly interface, provides all the tools necessary to optimise system control during static and cyclic test stages.

Software
Multitasking, user-friendly Windows-based software is pre-installed on the computer provided with the system. The software provides control of the following utilities and stages of a cyclic triaxial test:

• Saturation
  – Cell pressure increments with B value check
  – Back pressure increments with volume change measurement
  – Cell and back pressure ramp
• Consolidation
  – Isotropic consolidation with continuous volume change measurement
• K_o consolidation
  Vertical displacement loading with sample diameter control using either:
  – Direct measurement by radial belt with on-sample transducers
  – Measurement of sample volume change and height
• Stress path
  – Horizontal and Vertical Stress
  – s, t (average stress and shear stress)
  – p, q (mean normal stress and deviator stress)
  – Vertical stress using strain control
• Monotonic shear
  – Strain controlled static shear stage, drained or undrained
  – Loading in compression or extension, using the vertical actuator or the Tritech
  Any or all of the above stages can be performed in “Automatic mode” where the test parameters are entered at the start of the test or stage and the software takes control of managing the stages using predefined criteria.
• Cyclic loading
  – ASTM D5311 Load Controlled Cyclic Strength
  – ASTM D3999 Load Controlled Modulus & Damping
  – ASTM D3999 Displacement Controlled Modulus & Damping
  – Non Standard Single or multi cycle test
  – User defined or imported Waveshape
• Transducer limits
  – An air shut-off valve can be programmed to be activated using defined channel limits
• Calibration
  – Digital calibration using linear fit, polynomial fit or linearization
  – Transducer verification option

Specifications :

• Dynamic load capacity: ±5 kN or ±14 kN
• Static load capacity: 50 kN or 100 kN +
• Nominal operating frequency: up to 10 Hz (depending on soil and  test conditions)
• Max diameter sample up to 150 mm
• Max cell and back pressure ( depending on max working pressure of air supply)

Price : Call For Info

Informasi Produk :

Yudhistira

Hp. 0811 188 6845

Email : naysite2@gmail.com;