videoXtens 2-120 HP Extensometer

videoXtens HP sets new standards in accuracy and reproducibility

videoXtens HP is the perfect solution where international standards require high accuracy. Operator influence is virtually eliminated and consistent test results are assured.videoXtens HP is a non-contact, high-resolution extensometer developed for tests which require maximum precision.

Particular focus is on the following applications:

  • Plastics applications
  • Fiber composites applications
  • High resolution and measurement accuracy

Since the system employs non-contact measurement, there is no influence on the material characteristic values. Operator influence is also minimized, ensuring consistent test results.

videoXtens HP extensometer

Typical application videoXtens 2-120 HP

Including accurate measurement of tensile modulus values

Plastics to ISO 527-1 or ASTM D638

Requirements of ISO 527-1 for determination of tensile modulus: max. error ± 1 µm / ±1.5 µm when measuring the differential displacement between two measuring points (with elongation of 0.05% and 0.25% of the initial gauge length, with an initial gauge length L0 of 50 mm / 75 mm.
We recommend self-adhesive gauge marks (strips).

  • Specific advantages in this application
  • Satisfies the exacting calibration requirements for tensile modulus values to ISO 527-1, Annex C.
  • High-accuracy measurement of tensile modulus.
  • ZwickRoell extensometers exceed the requirements of the standards and are calibrated over the entire measurement range to Accuracy Class 0.5, ISO 9513.
  • Even brittle-fracturing plastics specimens can be tested without damaging the extensometer.
  • High-accuracy testing with ZwickRoell temperature chamber, including with determination of tensile modulus to ISO 527-1.
  • Enclosed system - connection via tunnel when testing in temperature chamber.
  • Resistant to environmental influences (e.g. air currents, variations in lighting); flexible tunnel minimizes signal interference.
  • Optimum, uniform specimen illumination by LEDs incorporated into the tunnel.

 

 

 

 

Fiber composites

  • Tensile tests on filament strands and laminates of fiber composites, e.g to ISO 527-4/5, ASTM D3039, ASTM D4018
  • In-plane shear tests (±45° method). In-plane shear response to ISO 14129 and ASTM D3518 (software option Second Measurement Axis required).
  • Specific advantages in this application
  • Brittle-fracturing fiber composites can be tested up to break without damaging the extensometer.
  • Accuracy Class 0.5 to EN ISO 9513. ZwickRoell extensometers exceed the requirements of the standards and are calibrated over the entire measurement range to Accuracy Class 0.5, ISO 9513.
  • Accuracy Class B1 to ASTM E83 from a gauge-mark separation of 15mm.
  • High-accuracy testing with ZwickRoell temperature chamber, including with determination of tensile modulus to ISO 527-1.
  • Enclosed system - connection via tunnel when testing in temperature chamber.
  • Resistant to environmental influences (e.g. air currents, variations in lighting); flexible tunnel minimizes signal interference.
  • Optimum, uniform specimen illumination by LEDs incorporated into the tunnel.

High resolution and measurement accuracy

  • Calibration requirements for tensile modulus values to ISO 527-1, Annex C
  • Accuracy class B1 to ASTM E83 from a gauge mark distance of 15 mm
  • Accuracy class 0.5 to EN ISO 9513. ZwickRoell extensometers exceed the requirements of the standards and are calibrated over the entire measurement range to ISO 9513 in accuracy class 0.5
  • Highly accurate testing with ZwickRoell temperature chamber, even for determination of the tensile modulus to ISO 527-1

Key Advantages and Features

Simple operation

  • Easy to operate
  • Automatic gauge-mark recognition and acquisition of initial gauge-length L0.
  • Tamper-proof: anti-tamper paint is applied to the lenses for the complete system so nothing can be adjusted. An important requirement for reliable test results.
  • Easy alignment to the specimen: videoXtens is centrally aligned to the gauge marks via the connection to the crosshead (option).
  • Compensation for different specimen thicknesses plus testing shear specimens.
  • Wear-free system = low-maintenance. The systems also feature an extremely long service life.
  • Connection to non-ZwickRoell machines via ±10V interface.

High accuracy and repeatability

  • High accuracy and repeatability
  • Extensometers mounted using stable, low-vibration support arms.
  • Housing provides protection against dirt and dust and inadvertent misalignment of the components.
  • Exact synchronization of all measurement channels.
  • Specially developed lighting provides continuous high-quality contrast ratios on the specimen, even with varying environmental conditions.
  • Industrial-quality cameras and high-quality, low-distortion lenses.
  • ZwickRoell extensometers exceed standards requirements, and are calibrated over the entire measurement range to ISO 9513 in the corresponding accuracy class.
  • The videoXtens 2-120 HP and videoXtens biax 2-150 HP are calibrated in accuracy class 0.5 to ISO 9513, with the first calibration point starting at 20 μm.
  • Additional calibration data-points for traceable, standard-compliant Young's modulus determination on plastics to ISO 527 (e.g. via additional calibration value at 25 µm) with the videoXtens 2-120 HP.
  • Compliance with strict requirements for determination of the tensile modulus to ISO 527 Appendix C (videoXtens 2-120 HP and videoXtens biax 2-150 HP).
  • The videoXtens biax 2-150 HP measures the change in width and Poisson’s ratio with an incomparable accuracy never before seen with non-contact extensometers.

Automatic centering

  • Automatic centering adjustment
  • videoXtens tracks at half crosshead speed via the connection to the crosshead, keeping the testing operation automatically in focus and making optimum use of the measuring range (larger measuring range possible).
  • This results in increased system measurement accuracy; the gauge marks shift less in the image and are captured in the center of the lens (low lens distortion).

Testing without gauge marks

  • Pattern recognition: testing with software gauge marks
  • The innovative pattern-recognition algorithm allows virtual gauge marks to be applied to the specimen. The gauge marks can be changed retrospectively and re-calculated (Test Re-Run option). It doesn't get any more convenient!
  • The essential requirement is for a pattern on the specimen - either a natural pattern due to a structured surface or an artificial pattern which can quickly be applied using a marker spray or by stippling.

Software Options 

testXpert III testing software offers various options for precise, traceable non-contact extension and strain distribution measurement. 

Test re-run

The optional Test ReRun module enables subsequent recalculation of strain on the basis of an image series recorded during a test, using a different initial gauge-length (provided multiple markings are present). This can be particularly advantageous in component testing, for example, when it is necessary to evaluate local strain at different locations, or in standard tensile tests when specimen necking has occurred outside the original initial gauge-length.

Automatic symmetrical adjustment of strain around necking to ISO 6892-1, Annex I

The recalculated strain can, of course, be synchronized subsequently with the other measurement values via the testXpert testing software.

Strain distribution

The Strain Distribution option enables determination of local strains at multiple measuring locations along the specimen gauge-length. These are available as channels in testXpert. Up to 16 measuring locations are automatically recognized and evaluated during the test. This option also allows automatic real-time symmetrical adjustment of the initial gauge-length around the necking (to ISO 6892-1, Annex I).

Video Capturing

Video capture is a recording of the test (without retrospective recalcualation). The recording is synchronized with the measured curve, enabling the test to be viewed retrospectively. The option includes no hardware, as recording and synchronization take place entirely via the videoXtens system.

2D dot matrix

This option allows two-dimensional measurement of dots applied to a planar specimen surface. This enables determination of local strains and specimen inhomogeneities under load. X and Y coordinates, as well as the distances between dots, are available as measured values.

Up to 100 measurement dots can be measured in any desired arrangement or in matrix form. Display in testXpert III is limited to 15 channels.

This option uses only one camera for measurement; any other cameras present are switched off beforehand.

Second measurement axis option 

With this option, biaxial measurements can be performed: In addition to the longitudinal strain, transverse strains can also be recorded—for example the change in width. Alternatively, change in width can of course also be measured alone.

  • Two versions are available for measurement of transverse strain:
  • Direct measurement on the specimen edge without additional markings (required for the determination of the r-value). For this version a backlight is required.
  • Measurement of the specimen surface with dot markings or sprayed-on pattern. For this version the specimen is illuminated with an incident light lamp.

Deflection measurement 

videoXtens can also be used for flexure tests. There are several options for measuring specimen deflection, depending on the type of test and the specimen condition and properties:

  • Measurement using incident light via marks on the specimen
  • Measurement using backlight on the specimen lower edge
  • Measurement of deflection in the test axis or of the polynomial approximation of the curve

Maximum deflection that can be measured: with videoXtens the maximum deflection corresponds to the FOV; with videoXtens Array to 1/3 of the total FOV (in this case deflection is measured with one camera only).

Technical Overview

videoXtens 2-120 HP

Type

videoXtens 2-120 HP

Item No.

1034953

Field of view (FOV)

With test area width 440 mm [AllroundLine] and zwickiLine

Min. 120 x 50

mm

With test area width 640/1040 mm [AllroundLine]

Min. 140 x 60

mm

Initial gauge length

With test area width 440 mm [AllroundLine] and zwickiLine

5 ... 100

mm

With test area width 640/1040 mm [AllroundLine]

5 ... 110

mm

Measurement travel, max.

With test area width 440 mm [AllroundLine] and zwickiLine

110 - initial gauge length

mm

With test area width 640/1040 mm [AllroundLine]

130 - initial gauge length

mm

Measurement travel, max. at 50 mm initial gauge length

With test area width 440 mm [AllroundLine] and zwickiLine

60 (120 % strain)

mm

With test area width 640/1040 mm [AllroundLine]

80 (160 % strain)

mm

Measurement travel, max. at 75 mm initial gauge length

With test area width 440 mm [AllroundLine] and zwickiLine

35 (45 % strain)

mm

With test area width 640/1040 mm [AllroundLine]

55 (75 % strain)

mm

Resolution at ambient temperature

0.15

µm

Resolution to ISO 9513 in ZwickRoell temperature chamber

At -20 ... +250 °C

Max. 0.4

µm

At -40 °C

Max. 0.6

µm

At -55 °C

Max. 0.8

µm

Frame rate / maximum measured-value acquisition-rate, max.

500

fps / Hz

Test speed, max.

1000

mm/min

Dimensions

Height

250

mm

Width

375 ... 625

mm

Depth

91

mm

Tunnel length, starting at reference plane

90 ... 340

mm

Specimen thickness

0 ... 20

mm

Weight (incl. tunnel), approx.

10

kg

Accuracy class

To EN ISO 9513

0.5

To ASTM E83

B1 from gauge length 15 mm

Scope of delivery

Measuring head with 2 digital cameras including 2 lenses

Tunnel for minimizing negative environmental conditions (e.g. air currents) with integrated LED illumination

Software for image acquisition and evaluation

Accessory case with alignment and marking aids

INC module (for tC: RS module)

New testing technology for plastics laboratory

Raw material manufacturers, processors and users in the field of polymers have trusted the expertise of polymerphys IK for over 12 years. To support further expansion of their testing services, the company chose a testing machine with temperature chamber from ZwickRoell.
polymerphys IK GmbH
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