Tensile tests on plastics 08 January 2024

Tensile tests on plastics are used to determine essential material properties such as tensile strength, yield strength and modulus of elasticity, with Hegewald & Peschke able to supply a range of test systems optimally configured to test plastics according to DIN 527, ASTM D638, ISO 37 and ASTM D412.

A prime example is the tensile testing machine inspekt duo L 10kN from Hegewald & Peschke, which thanks to its test room height of 1,325mm is also suitable for testing materials with a large elongation and features pneumatic specimen grips 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 therefore ensured.

Hegewald & Peschke points out that 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 fibre-reinforced plastics is the so-called hold mode, which reduces parasitic gripping forces to prevent pre-damage of the materials. Specimen depth stops also ensure that the tensile specimen is clamped axially and that no transverse forces manipulate the test results.

In addition, the testing machine and grips can be operated directly on the machine, which makes work easier for the operator, especially when testing large quantities, and optimises workflows. Alternatively, operation via the LabMaster testing software is possible – with the ability to specify test parameters for different specimen shapes and materials.

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 ISO 527) and the elongation at break within one test.  

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