videoXtens 1-270 HP Extensometer

The videoXtens 1-270 covers a wide measurement range and is therefore excellent for high-extension materials.

Non-contact measurement system:

  • No influence on the material characteristics
  • No influence on sensitive specimenIdeal for whipping specimen - the videoXtens will not be damaged
  • Through connection to the crosshead, the gauge marks are always automatically centered in the field of view (FOV)—the measurement range is optimally utilized.
  • Mounting with low-vibration, stable support brackets. Easy alignment with the measurement range through the ergonomic height adjustability on the mounting.
videoXtens 1-270 Extensometer

Typical application videoXtens 1-270

Elastomer testing to ISO 37, ASTM D412 or DIN 53504

  • L0 = 10, 20 or 25 mm
  • Specific advantages in this application
  • Connection to crosshead ensures the gauge marks are always central and optimum use is made of the measuring range.
  • Unimpeded view of the specimen; no blind spot due to specimen grips - videoXtens is centrally aligned and tracked.
  • Accuracy Class 1: modulus values can also be determined in the initial range, e.g. stress at 10% strain.
  • Large measuring range.
  • Specimen whips at break and may damage contact-type systems.
  • Sensitive specimens are not affected by knife-edges - non-contact testing.
  • High accuracy, including at temperature with ZwickRoell temperature chamber in range from -55 to +250°C.
  • Enclosed system - connection via tunnel when testing in temperature chamber.

Rope testing (textiles)

  • Specific advantages in this application
  • Connection to the crosshead ensures the gauge marks are always central and optimum use is made of the measuring range.
  • Unimpeded view of the specimen; no blind spot due to specimen grips - videoXtens is centrally aligned and tracked.
  • Accuracy Class 1: modulus values can also be determined in the initial range, e.g. stress at 10% strain.
  • Large measuring range.
  • Specimen whips at break and may damage contact-type systems.
  • Sensitive specimens are not affected by knife-edges - non-contact testing.
  • High accuracy, including at temperature with ZwickRoell temperature chamber in range from -55 to +250°C.
  • Enclosed system - connection via tunnel when testing in temperature chamber.

Films testing to ISO 527-3

  • Specific advantages in this application
  • Accuracy Class 1 (from measurement travel 0.24 mm at least), allowing modules to be determined in the initial range also.
  • Sensitive specimens are not affected by knife-edges - non-contact testing.
  • Pattern recognition: a pattern is quickly generated over the entire specimen by stippling or stamping.
  • Connection to crosshead ensures the gauge marks are automatically always central and optimum use is made of the large measuring range.
  • Outflow of the film specimens during the test does not restrict the measuring range and does not therefore need to be allowed for.
  • Time-saving for research: no specimens are wasted due to break outside L0. Test Re-Run option and pattern recognition allow L0 to be adjusted retrospectively and the test re-calculated so that the break then lies within L0. Alternative: the strain distribution also included in this option automatically positions L0 around the area of highest strain if multiple gauge marks were placed before the test.

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 1-270

Type

videoXtens 1-270

Item No.

1043968

Field of view (FOV)

with test area width 440 mm [AllroundLine] and zwickiLine

270 x 215

mm

with test area width 640 / 1040 mm [AllroundLine]

330 x 260

mm

Initialgauge length

with test area width 440 mm [AllroundLine] and zwickiLine

5 to 220

mm

with test area width 640 / 1040 mm [AllroundLine]

5 to 260

mm

Measurement travel, max.

with test area width 440 mm [AllroundLine] and zwickiLine

260

mm - initial gauge length [mm]

with test area width 640 / 1040 mm [AllroundLine]

320

mm - initial gauge length [mm]

Measurement travel, max, with initial gauge length 10 mm

with test area width 440 mm [AllroundLine] and zwickiLine

250 (2500 % elongation)

mm

with test area width 640 / 1040 mm [AllroundLine]

310 (3100 % elongation)

mm

Measurement travel, max, with initial gauge length 20 mm

with test area width 440 mm [AllroundLine] and zwickiLine

240 (1200 % elongation)

mm

with test area width 640 / 1040 mm [AllroundLine]

300 (1500 % elongation)

mm

Measurement travel, max, with initial gauge length 25 mm

with test area width 440 mm [AllroundLine] and zwickiLine

235 (940 % elongation)

mm

with test area width 640 / 1040 mm [AllroundLine]

295 (1180 % elongation)

mm

Resolution at room temperature

with test area width 440 mm [AllroundLine] and zwickiLine

0.9

µm

with test area width 640 / 1040 mm [AllroundLine]

1.2

µm

Resolution to ISO 9513 in ZwickRoell temperature chamber

at -20 to +250 °C

max. 1.0

µm

at -40 °C

max. 1.3

µm

at -55 °C

max. 1.5

µm

Image rate / measured-value acquisition rate, max.

500

fps / Hz

Max. test speed

1000

mm/min

Dimensions

Height

175

mm

Width

306

mm

Depth

91

mm

Specimen thickness

0 to 20

mm

Weight, approx.

7.5

kg

Accuracy class

with test area width 440 mm [AllroundLine] and zwickiLine

to EN ISO 9513.

1

with test area width 640 / 1040 mm [AllroundLine]

to EN ISO 9513.

1 from measurement travel 0.24 mm

Scope of delivery

Measuring head with digital camera

Lens (12 mm)

Lens correction target

12 x 12

mm

Software for image acquisition and evaluation

Accessory case with alignment and marking aids

INC module (RS module for tC)

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
Top