Tensile tests measure the force required to break a plastic sample specimen and the extent to which the specimen stretches or elongates to that breaking point.
Specimens are placed in the grips of the universal tester at a specified grip separation and pulled until failure. For ISO 527 the test speed is typically 5 or 50mm/min for measuring strength and elongation and 1mm/min for measuring modulus. An extensometer is used to determine elongation and tensile modulus.
Specimen size: The most common specimen for ISO-527 is the ISO-3167 Type 1A multipurpose specimen.
The following calculations can be made from tensile test results:
*Tensile strength (at yield and at break)
*Elongation and percent elongation at yield
*Elongation and percent elongation at break.
It cover a range of plastics including thermosets, thermoplastics, and fiber-reinforced plastics. Test specimens may be rigid, semi-rigid, molded or extruded plastics, and are commonly in the shape of a dumbbell or dog bone.
The mechanical properties of plastics vary depending on the type of plastic, as well as the additives that may be incorporated into the formulation. Properties, such as strength, ductility and toughness, are influenced by different types of additives. To determine the appropriate testing equipment, it is important to understand how material behavior changes as a result of the various additives.
Refer UnitedTest electronic universal testing machine, load range 100N ~ 50Kn. With pneumatic side-action grips, Wedge grips and manual screw action grips are also suitable. The choice of jaw faces may vary depending on sample and material type, but serrated faces are most common.