Plastic Tensile Strength Test

The test measures the force as a function of the strain being applied to the plastic sample.

Plastic tensile strength test. It measures the force required to break a composite or plastic specimen and the extent to which the specimen stretches or elongates to that breaking point. The most common way to measure the yield strength of plastics is with a tensile test. A tensile test is typically governed via standards and the two most common in the plastics industry are astm d638 and iso 527. The test method can be used for testing materials up to 14mm 0 55 in and the material should be in the shape of a dumbbell or dog bone.

Astm d638 is one of the most common plastic strength specifications and covers the tensile properties of unreinforced and reinforced plastics. The figure below from quadrant engineering plastic products shows the test geometry. Tensile testing is a destructive test process that provides information about the tensile strength yield strength and ductility of the metallic material. A wide variety of grips are available for tensile testing of plastics.

Astm d638 is the most common testing standard for determining the tensile properties of reinforced and non reinforced plastics. This includes astm d638 technically equivalent to iso 527 1 is a testing standard which ascertains the tensile properties of a plastic material. Iso 527 2 is performed on a universal testing machine by applying a tensile force to a sample specimen and measuring various properties of the specimen material under stress. With the use of plastics being at an all time high it is critical that manufacturers be able to properly gauge the mechanical strength of their materials.

In addition the wintest software includes all applicable calculations like yield stress strain e modulus uts etc. How to perform a tensile test on plastics according to iso 527 2. These include several types of self tightening manual hydraulic and pneumatic versions that are necessary for positive gripping. The test is conducted at tensile rates ranging from 1 to 500 mm min until the specimen fails yields or breaks.

This test method uses standard dumbell or dogbone shaped specimens under 14mm of thickness. For this test plastic samples are either machined from stock shapes or injection molded.