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Testing machine for plastic tensile tests

Tensile tests on plastics

Tensile tests on plastics are used to determine essential material properties such as tensile strength, yield strength and modulus of elasticity.

A test system optimally configured for this type of material testing was recently delivered by Hegewald & Peschke to a company specializing in the use of polymers in dental technology. With the test configuration, the entire specimen range from thermosets to semi-crystalline thermoplastics to elastomers can be tested according to DIN 527, ASTM D638, ISO 37, ASTM D412.

Due to its test room height of 1325 mm, the tensile testing machine inspekt duo L 10 kN is also suitable for testing materials with a large elongation. Pneumatic specimen grips are used for clamping the tensile specimens. In combination with the control unit, reproducible pneumatic gripping of the specimen with controlled gripping pressure (specimen-specific adjustable) is ensured. One advantage of the parallel clamping device is that this clamping pressure acts reproducibly over the entire tensile test and thus thin materials and foils can also be tested without jaw cracking.

Of particular interest for fiber-reinforced plastics is the so-called hold mode, which reduces parasitic gripping forces to prevent pre-damage of the materials. Specimen depth stops ensure that the tensile specimen is clamped axially and that no transverse forces manipulate the test results.

The testing machine and grips can be operated directly on the machine. This makes work easier for the operator, especially when testing large quantities, and optimizes workflows. Alternatively, operation via the LabMaster testing software is possible. Here, for example, the test parameters for different specimen shapes and materials can be specified.

Another component of the testing system for plastic tensile tests is the long-distance extensometer for determining elongation at break and elongation at tensile strength on plastics and elastomers with high elongation. The gauge has an inductive fine measuring range for the standard-compliant determination of the modulus of elasticity (according to ISO527) and the elongation at break within one test.

The status of the machine is displayed via LEDs directly on the front of the testing machine. The entire testing system is designed to be safety-compliant in accordance with the Machinery Directive.


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