videoXtens dynamic
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- 90 mm
- Ambient temperature
- Up to 250°C
- Fatigue tests
- Dynamic tests
- Low Cycle Fatigue
- Static tensile tests
- Sensitive specimens such as films/foils, wires
- Composites
- Metals
Description
The videoXtens dynamic is a non-contact, high resolution extensometer specifically developed for fatigue tests. It supports strain-controlled testing up to 30 Hz and peak value measurement up to 100 Hz.
Thanks to its extraordinary accuracy, tests with low strains are also possible, such as fatigue tests on composites according to ASTM D3479 or low cycle fatigue tests according to ASTM E606 or SEP 1240.
The videoXtens dynamic can also be used to perform static tensile tests such as the determination of the tensile modulus to ISO 527, ASTM D3039, ISO 6892-1 or ASTM E8. A maximum field of view of 90 mm must be observed.
The videoXtens dynamic can either be fully integrated into ZwickRoell fatigue testing machines or electronics or operated via analog signal on third-party machines.
videoXtens dynamic application possibilities
The videoXtens dynamic provides maximum efficiency and flexibility for strain-controlled fatigue tests. This opens up new application possibilities:
- Thin and sensitive specimens such as foils, wires
Some applications do not work with a clip-on extensometer because the specimens are simply too thin and the clip-on extensometer cannot be attached. The videoXtens dynamic opens up new possibilities for strain-controlled testing of these materials.
There are also applications where a clip-on extensometer can be attached because the specimen thickness is sufficient. However, the specimen surface is very sensitive, which is why the measuring edges of the extensometer cause notches that falsify the test result. - Low strains
The high accuracy of the videoXtens dynamic means that even applications with low strains can be measured reliably. This enables low cycle fatigue or composite tests to be carried out in compliance with industry standards. - High test frequencies up to 30 Hz
Strain controlled fatigue tests are also possible at high test frequencies up to 30 Hz, for example in the case of high cycle fatigue tests.
| Sensitive specimens | Composites | Metals | Plastics | |
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| Dynamic tests | Dynamic or fatigue tests on sensitive specimens
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| Low cycle fatigue
Fracture mechanics
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| Static tensile tests | Tensile tests for determination of the tensile modulus on sensitive specimens | |||
| Advantages |
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Achieve reliable test results quicker
- For use with a temperature chamber, the videoXtens dynamic does not need to be converted or retrofitted in any way, nor does it need to be recalibrated.
- With preconfigured settings, the videoXtens dynamic can be implemented for dynamic, static or temperature controlled tests at the push of a button.
- Operator errors that may occur when attaching the extensometer and setting the initial gauge length are avoided.
- By not using the clip-on extensometer, the specimen remains free of damage, that could otherwise occur from cutting.
Sensitive specimens
For the very first time, the videoXtens dynamic allows strain measurement and control of very thin and sensitive specimens.
Attachment of a clip-on to very thin specimens is not possible, sine this extensometer would damage the specimen with its knife edges. The non-contact extensometer prevents this pre-damage and thus reduces specimen waste. And even more importantly: the optical measurement ensures that your results are neither influenced nor distorted.
For thin, fragile specimens such as films, we offer a gripping aid for easy and correct insertion and alignment of the specimen in the specimen holder. With this tool you can keep your specimen waste to a minimum and achieve consistent, reliable test results.
Composites
For example, the videoXtens dynamic can be used to perform tensile fatigue tests on fiber-reinforced polymer matrix composites to ASTM D3479 (method B) and ISO 13003 with constant strain amplitude.
These tests are carried out both at ambient temperature and in a temperature-controlled environment. The videoXtens dynamic offers maximum ease of use: The videoXtens dynamic does not need to be modified either when installing or removing the temperature chamber via the rail guide. The extensometer is simply moved slightly backwards within the holder so that the temperature chamber can be moved over the rails.
Due to the non-contact measurement, the measuring edges of the videoXtens dynamic cannot slip during specimen break, so the test results are not affected. Even splintering material cannot damage the optical extensometer during specimen break. Invalid tests are reduced in comparison to clip-on extensometers, as the non-contact strain measurement does not damage the specimen and the risk of incorrect results is minimized.
ASTM D3479 also references ASTM E739 for test result evaluation. For this standard, testXpert offers a "Fatigue Data Evaluation" software add-on, which can be used to generate S-N curves in compliance with the standard by pressing a button.
Metals
The videoXtens dynamic extensometer can be used for low cycle fatigue tests.
The optical videoXtens dynamic offers the following advantages over the clip-on extensometer, especially for tests on sheet steel with buckling support according to SEP 1240:
- Frequently occurring complications when attaching the clip-on extensometer to the buckling support are eliminated by the optical extensometer.
- The specimen is not pre-damaged by the knife edges.
- No operator error in setting the initial gauge length.
Plastics
Fatigue tests on plastics such as elastomers can be reliably tested with the videoXtens dynamic extensometer because, unlike clip-on extensometers, the specimen is not pre-damaged by the knife edges, which would influence the test result.
In addition, conventional clip-on extensometers usually have a limited measurement travel distance, which cannot adequately record the strain on elastic specimens.
2-in-1: static and dynamic tests
The videoXtens dynamic can be used for both static and dynamic tests. By using a single extensometer for both tests, you maximize efficiency and save costs.
Determination of the tensile modulus in static tests according to ISO 527 (tensile test on plastics), ASTM D3039 (tensile test on composites), ISO 6892-1 (tensile test on metals) or ASTM E8 (tensile test on metals) can be easily carried out. Please not the maximum field of view of 90 mm.
