Longstroke extensometer

Max. measurement range

1000 mm

Temperature range

-70°C ... +250°C

Type of test

Tensile tests
Cyclic tests

Material

Elastomers
Films
Flexible plastics
Textiles

Longstroke extensometer Function and application Request a consultation

The extensometer for elastic materials

The longstroke extensometer is designed for testing extensible plastics, elastomers, films, textiles, leather and similar stretchable materials.

It is primarily used for direct extension measurement on specimens with medium and large extensions in tensile and hysteresis tests and also in temperature chambers (using extended sensor arms). The robust mechanical design of the guide assemblies, together with the extensometer’s swiveling knife-edges, ensures safe, reliable operation with specimens prone to whipping such as elastomers.

Longstroke extensometer

Function description

The fundamental component of the extensometers is a precise guide profile with two weight-compensated measurement carriages. The two attached sensor arms with interchangeable knife edges are suitable for round and flat specimens, as well as notch-sensitive materials. The gripping force of the sensor arms can be adjusted at the specimen.

The sensor arms and knife edges (round/straight) are included in the extensometer scope of supply.

Applications

The long travel extensometer is suitable for direct extension measurement on all elastic materials, including elastomers, plastics, leather, textiles, etc. and can be used for exact determination of offset yield and strain at break in tensile tests. Standards-compliant secant modulus or E-modulus determination with the specified initial gauge length is not provided.

Advantages and features

Can be used up to specimen break, even with high loads and brittle specimen material.
Very high resolution over the entire measurement range.
Very large measurement travel.
Synchronous force-displacement acquisition.
Very low drag-forces.
The long travel extensometer can be combined with all analog or digital clip-on extensometers or with a manual transverse strain extensometer.
The extensometer is controlled automatically via the test program. At the start of the test, the sensor arms are attached via electric motor. At the end of the test they are withdrawn and the initial gage-length is re-set via the traverser movement.
Robust construction with impact-resistant measurement system.
Low-friction measuring-carriage mounting minimizes transmission errors.