Uniaxial & Triaxial Testing Systems

Automatic configuration for uniaxial and triaxial test including AUTOMAX Multitest and SERCOMP 7 control consoles
Wykeham Farrance proposes the complete range (three different configurations) of testing systems for the determination of Elastic Modulus / Poisson’s ratio and strength of rock cores in uniaxial and triaxial conditions, to satisfy every sophistication and budget requirement:
- ADVANCED AUTOMATIC STRESS PATH UNIAXIAL AND TRIAXIAL TEST SYSTEM: features the full automation of triaxial testing including stress path (multi-stage) and post-peak softening analysis. 
- AUTOMATIC UNIAXIAL AND TRIAXIAL TEST SYSTEM: the whole system performs either uniaxial or triaxial automatic tests under load/stress control. 
- SEMI-AUTOMATIC UNIAXIAL AND TRIAXIAL TEST SYSTEM: with compression machine for axial loading and a manually-operated pump for confining pressure. It performs either uniaxial or triaxial tests under load/stress control.

Stress Path Triaxial and Uniaxial Fully Automatic Test System

Used for measuring the elastic modulus and strength of rock specimens under uniaxial and triaxial.

Standards EN 14580 EN 1926 ASTM D2664 ASTM D3148 ASTM D5407 ASTM D2938 ISRM ASTM D7012

Description

 

CONTROLS Stress path triaxial and uniaxial automatic test system is designed to test various materials, from soft sandstone to high strength marbles.
The test system comprehends:

  • ADVANTEST ROCK, servo-hydraulic control console for axial load application in conformity with the relevant Standards. Includes a dedicated software for triaxial testing which also controls the SERCOMP ROCK and automatically determines the sample failure envelope.  The ADVANTEST ROCK performs loading-unloading ramps and can also be used for load/stress/displacement/strain controlled testing on concrete, fiber reinforced concrete, shotcrete, etc. (with the suitable options and accessories)
  • SERCOMP ROCK. Servo-hydraulic control console for confining pressure control into the Hoek cell (triaxial test only). It runs as a remotely controlled unit, fully operated by the Advantest Rock software. Includes 4 additional channels for strain / displacement transducers.
  • ADVANCED SOFTWARE: ADVANTEST ROCK and SERCOMP ROCK are linked to a single PC for data acquisition and results elaboration.The overall test information and readings are always available on the PC screen:
    • Axial load and sample strength
    • Hoek cell confining pressure
    • Sample deformation measured by strain gauges and external displacement transducers
    • Plus any additional load/strain/displacement readings from external transducers that may be useful for research purposes.

 

  • HIGH STIFFNESS COMPRESSION FRAME to be selected from the wide CONTROLS product range, conforming to the size of the sample and the expected strength. Due to the typical high strength and fragility of rocks we recommend high capacity test frame (4000kN or 5000kN capacity).
  • HOEK CELL: various models for different sample size are available: from EX type with dia. 21.46 mm up to HQ type for core with dia. 63.5 mm.

 

Triaxial test is carried out automatically with multiple failure stages: from a single specimen it is possible to plot the entire failure envelope,
 
Test procedure

  • Axial and horizontal stresses are increased hysotropically up to a defined level
  • Cell pressure is maintained constant and axial stress is increased
  • When the sample approximates maximum strength, the cell pressure is automatically increased up to a defined level
  • Cell pressure is again maintained constant and axial stress is increased
  • When the sample again approximates maximum strength, the cell pressure is further increased
  • The above procedure is automatically repeated several times
  • Maximum peak strength is reached and, in case of displacement control, the test is continued (softening phase)
  • Cell pressure is reduced in steps and, for each step, the residual strength is measured
  • All the maximum peak loads are plotted against corresponding values of cell pressure building the complete failure path.

For a typical configuration of an Automatic triaxial test system ask the cooperation of our specialists.

Main Features

 

  • Automatic performance of triaxial tests with combined control of axial load and confining pressure
  • Multiple failure stages triaxial test (stress – path mode) carried out automatically, the entire failure path is derived from a single specimen including post-peak softening phase
  • Advanced testing system suitable for extremely variable materials, from soft sandstone to high-strength marbles
  • Determination of Elastic modulus, Poisson’s ratio and strength characteristics of rock specimens under uniaxial and triaxial conditions 
  • Also suitable for load, stress, displacement and strain-controlled testing on concrete, fibre-reinforced and shotcrete specimens (with the relevant options and accessories)
  • Fully programmable test procedures including axial load and confining pressure levels and combinations
  • Integrated data acquisition and results elaboration including failure envelope plotting
  • Extremely flexible system ideal for research purposes
Products
 
 
32-C7022/RCK
SERCOMP7 ROCK, servohydraulic control console suitable for lateral pressure control in triaxial testing system for rock (hoek cell method). In combination with the unit ADVANTEST9 ROCK performs the stress-path test fully automatically. 230V/50Hz/1ph.
 
32-C7023/RCK
SERCOMP7 ROCK, servohydraulic control console suitable for lateral pressure control in triaxial testing system for rock (hoek cell method). In combination with the unit ADVANTEST9 ROCK performs the stress-path test fully automatically. 220V/60Hz/1ph.
 
32-C7024/RCK
SERCOMP7 ROCK, servohydraulic control console suitable for lateral pressure control in triaxial testing system for rock (hoek cell method). In combination with the unit ADVANTEST9 ROCK performs the stress-path test fully automatically. 110V/60Hz/1ph.
 
32-C9842/RCK

ADVANTEST9 ROCK, servohydraulic control console suitable for triaxial testing on rock (hoek cell method). In combination with the unit SERCOMP7 ROCK performs the stress-path test fully automatically.  230V/50Hz/1ph.

 
32-C9843/RCK

ADVANTEST9 ROCK, servohydraulic control console suitable for triaxial testing on rock (hoek cell method). In combination with the unit SERCOMP7 ROCK performs the stress-path test fully automatically.  220V/60Hz/1ph.

 
32-C9844/RCK

ADVANTEST9 ROCK, servohydraulic control console suitable for triaxial testing on rock (hoek cell method). In combination with the unit SERCOMP7 ROCK performs the stress-path test fully automatically.  110V/60Hz/1ph.

Technical Specifications

 

ADVANTEST 9 ROCK
Hydraulic group

  • Max. working pressure: 700 bar
  • Max. oil delivery: 2 lpm at low pressure, 0.7 lpm at high pressure
  • 4 hydraulic ports for connection of test frames
  • Flow control via servo-controlled proportional valve
  • Oil cooling system with forced ventilation
  • 4 ON/OFF valves with electronic control

Hardware and on board software

  • Maximum resolution: 1/524,000 divisions
  • 8 input channels:
    • 4 for load sensors (load cells or pressure transducers)                
    • 4 for displacement transducers (potentiometric, LVDT amplified or analogical) and for deformation transducers (clip gauge, strain gauge).
  • Electrical characteristics of the conditioners:
    • VEXC: from 0.5 to 10 V DC selected via software
    • Single/dual ended input
    • Input signal from -2.5 to +2.5 V DC
    • Zero and gain adjustable via software                                            
  • Data acquisition synchronized on all channels
  • 8 analogical outputs corresponding to each channel for possible use of an external data acquisition system
  • Test execution with control of:
    • Load/specific load                 
    • Displacement                                                 
    • Strain
  • Auto-diagnostic system including oil level and oil filter obstructed
  • 320×240 pixel display
  • Storage of multiple calibration curves for immediate connection of different sensors.
  • Low frequency Dynamic tests: max. frequency 0.1 Hz (depending on the wave amplitude)

Phisical specifications

  • Power rating 750 W
  • Voltage: 230V, 50Hz, 1ph or 230V, 60Hz, ph or 110V, 60Hz, 1ph
  • Dimensions (lxwxh): 470x410x1000 mm
  • Weight approx.: 120 kg, excluding PC and printer

SERCOMP 7 ROCK

  • Max. working pressure: 700 bar
  • Max oil delivery: 0.7 l/min
  • Flow control via servo-controlled proportional valve
  • 4 additional channels for strain / displacement transducers
  • Power rating: 750 W
  • Dimensions (LxWxH): 470x410x1000 mm
  • Weight approx.: 120 kg

PC and SOFTWARE

  • PC and printer of the latest generation
  • Remotely control the entire system. Display graphical and numerical data including multi-plot mode, e.g. 3 different deformation curves with respect to a single time axis
  • Execute tests and sequences of steps/cycles programmable by the user
  • Print out test reports
  • Allow the real time modification of the test parameters during the test execution, including active control channel
  • Language selection: English, French, Spanish, Italian, plus another language which can be created by the user
Accessories and Spare Parts
 
50-D2999
PC cabinet for testing systems.110-230V, 50-60Hz,1ph.

Automatic Uniaxial and Triaxial Test System

Used for measuring the elastic modulus and strength of rock specimens under uniaxial and triaxial.

Standards EN 14580 EN 1926 ASTM D2664 ASTM D3148 ASTM D5407 ASTM D2938 ASTM D7012

Automatic configuration for uniaxial and triaxial test including AUTOMAX Multitest and SERCOMP 7 control consoles
Description
 
 
32-C7022/S
Sercomp 7, servohydraulic control console for la- teral pressure to perform triaxial rock testing. 230V, 50 Hz, 1ph.
 
32-C7023/S
Sercomp 7, servohydraulic control console for la- teral pressure to perform triaxial rock testing. 220V, 60Hz, 1ph.
 
32-C7024/S
Sercomp 7, servohydraulic control console for la- teral pressure to perform triaxial rock testing. 110V, 60Hz, 1ph.
 
50-C20M82
AUTOMAX MULTITEST computerized control console for up to 2 frames (expandable up to 4) capable to perform the following tests: – compression, flexure, indirect tensile strength (software module included); – Elastic modulus and Poisson ratio determination
 
50-C20M84
AUTOMAX MULTITEST computerized control console forup to 2 frames (expandable up to 4) capable to perform the following tests: – compression, flexure, indirect tensile strength (software module included); – Elastic modulus and Poisson ratio determination
 
Main Features

 

  • Automatic performance of uniaxial and triaxial tests with individual but combined control of axial load and confining pressure
  • Axial and horizontal stress are increased isotropically up to a defined level in automatic way
  • The 2 consoles are operated independently and the failure envelope is obtained by few individual tests (single – stage) with automatic application of axial load and confining pressure at different levels
  • Cell pressure is maintained constant (± 1%) and axial stress is increased automatically at constant load rate up to specimen failure (single-stage)
  • AUTOMAX Multitest console allows to perform tests under load and strain/displacement console
Products
 
 
77-PV46A02

IPC Global PReSBOX – Shearbox Compactor – 208-240V / 50-60Hz / 1ph.

 
Technical Specifications

AUTOMAX Multitest
The AUTOMAX Multitest consists of an ergonomic control console which houses the power unit and the PC.
Specifications
Hydraulics

  • Dual stage pump: centrifugal low pressure for fast approach and automatic switching to radial multi-piston high pressure for loading
  • DC motor. 720 W, 50-60 Hz
  • Maximum working pressure 650 bar
  • Third and fourth frame option, active frame selection by software
  • Flow-sharing technology to perform loading and unloading cycles
  • ES Energy Saving technology to reduce power consumption and silent operation
    Hardware
  • 131.000 points effective resolution
  • Closed-loop P.I.D. control
  • 4 channels for load sensors (pressure transducers/load cells)
  • 1 channel for confining pressure (acquisition only)
  • 6 channels for strain/displacement transducers (potentiometers, magnetostrictive, LVDTs)
  • 3 channels for strain gauges
  • Memorization of the calibration curve enables sensors to be connected and used immediately
  • Digital linearization of the calibration curve (multi-coefficient)


SERCOMP 7
The hydraulic unit SERCOMP 7 controls the lateral pressure in the Hoek cell in case of triaxial testing. A cooling device is incorporated, for superior control and uniformity of pressure throughout the test.
The control console includes a large graphic display with a mem­brane keyboard allowing easy setting and test monitoring.
 Specifications
Hydraulics

  • Maximum working pressure: 700 bar
  • Maximum oil delivery: 0.7 litres/min
  • Flow control: by servo-valve system
  • Hydraulic ports: 2
  • Power: 750 W
  • Voltage: 230 V, 50 Hz, 1 ph (other voltages are available – see Ordering info)
  • Dimensions: 470x410x1000 mm(d x w x h)
  • Weight: 120 kg (approx.)

Hardware

    • Large graphic display with a mem­brane keyboard for inputting test data
    • 65.000 points effective resolution
    • Closed-loop P.I.D. control

Semi-Automatic Uniaxial and Triaxial Test System.

Used for measuring the elastic modulus and strength of rock specimens under uniaxial and triaxial.

Standards EN 14580 EN 1926 ASTM D2664 ASTM D3148 ASTM D5407 ASTM D2938 ASTM D7012

Semi-automatic Uniaxial and Triaxial test system based on semi automatic compression machine 50-C56W02, manually-operated pump 32-D0558, Hoek cell NX type 32-D0556/HC and Datalog 8 channels 82-P9008
Description
 
The Semi-Automatic configuration for determining the elastic modulus and strength characteristics of rock specimens is based on automatic WIDZARD AUTO compression machine for axial loading and manually-operated pump for confining pressure. It performs either uniaxial or triaxial tests under load/stress control (no strain).
The 2 systems are operated independently and the failure envelope is obtained by a series of individual tests (single – stage) with manual adjustment of the axial load and manual application of the confining pressure at different levels.

Note: For a typical configuration of an Semi-Automatic triaxial test system see Buyer’s Guides.

TEST PROCEDURE:
  1. axial and confining stresses are independently increased isotropically up to a defined level: axial load is controlled by a special pressure-compensated proportional valve; confining pressure is controlled by the manual pump with pressure maintainer;
  2. cell pressure is maintained constant and axial stress is constantly increased by the pressure-compensated proportional valve up to specimen failure (single-stage);
  3. the procedure above is repeated N times using new specimens at various confining pressure levels. Combining these results it is possible to plot the failure envelope with N points using the dedicated MS Excel spreadsheet.
  4. strain values are acquired by Datalog 8 datalloger.
Main features
  • Suitable for determining elastic modulus and strength characteristics of rock specimens under uniaxial and triaxial conditions
  • Composed by 2 indipendent systems: high stiffness compression machine and low friction manual pressure maintainer
  • Max working lateral pressure: 40 MPa
  • Advanced external data acquisition system with new touch screen Datalog 8
 
Products
 
 
32-D0558
Low friction pressure maintainer for lateral pres-sure in the Hoek triaxial cells
 
50-C56W02

WIZARD AUTO COMPACT-Line automatic compression machine, 3000 kN cap. for cylinders up to 160 x 320 mm and cubes up to 200mm. Conforming to EN 12390-4. 230 V, 50-60 Hz, 1 Ph

Technical Specifications
Lateral pressure system
The 32-D0558 Low friction manual pressure maintainer is used for maintaining constant the desired lateral pressure in the Hoek triaxial cells. The unit comprises a hand pump connected to a special oil reservoir, a precision pressure gauge, a pressure maintainer and a flexible hose 3 m long with a 90° quick release coupling.
  • Max working pressure: 40 MPa
  • Weight approx.: 15 kg

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