Tensile testing of plastics supplies the data for a sample.
Plastic tensile test.
The figure below from quadrant engineering plastic products shows the test geometry.
Pull off speeds up to 20 m s are achieved.
Specimens are placed in the grips of the universal tester at a specified grip separation and pulled until failure.
Tensile testing also known as tension testing is a fundamental materials science and engineering test in which a sample is subjected to a controlled tension until failure.
For this test plastic samples are either machined from stock shapes or injection molded.
The tensile test the test measures the force as a function of the strain being applied to the plastic sample.
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.
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.
The high speed tensile test can be performed using drop weight testers or hydraulic high speed tensile testing machines.
The tensile testing machine.
A tensile test is typically governed via standards and the two most common in the plastics industry are astm d638 and iso 527.
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.
From these measurements the following properties can also be determined.
Most iso 527 2 testing is performed on a table top universal testing machine.
Tensile tests are used for example in the validation of the chemical resistance of plastics since the results of this test disclose even extremely small changes in the material.
This guide is designed to introduce you to the basic elements of an astm d638 plastic tensile test including an overview of the equipment software and samples needed.
Separate tensile test methods are commonly applied to polymer films astm d882 or iso 1184 and elastomers astm d412 or iso 37.
A 5kn or 10kn 1125 or 2250 lbf system is most common but as reinforced plastics and composites increase in strength higher capacity units such as 30 or 50 kn systems may be required.
Din en iso 527.
In addition the use of direct extension measurement on the specimen is possible allowing informative stress strain diagrams to be generated.
Astm d 638 tensile test procedure.
A universal testing machine tensile testing machine is needed to perform this test.
This includes astm d638 technically equivalent to iso 527 1 is a testing standard which ascertains the tensile properties of a plastic material.
