Mechanical testing: Dynamometer, Pendulum (IZOD), Durometer (Shore A-D) < Instruments

Mechanical testing: Dynamometer, Pendulum (IZOD), Durometer (Shore A-D)

Mechanical testing: Dynamometer

A dynamometer is a lab instrument that can be used to carry out two different types of mechanical tests: tensile testing and flexural testing. The dynamometer is composed of two vertical columns joined by a fixed beam and a mobile beam.

For the tensile test (ISO 527), the sample which shows a dogbone shape is clamped vertically between two beams and the mobile beam moves at a given speed rate with the purpose of drawing the force/deformation curve. Tested sample submits a constant deformation over time until breaking or deformating (lengthening) point which is considered as a peak of resistance.

The dynamometer is involved in flexural testing (ISO 178). Sample is clamped on the lower beam together with a support and then a load is applied to its centre until breaking or deformation point which is considered as predetermined point.

Mechanical testing: Pendulum (IZOD)

The Izod impact test (ISO 180) is a standard process that is made to determine mechanical and physical properties of polymers, compounds and finished products.

This test is performed by releasing a pendulum from a given height in order to impact with the sample of tested material with the purpose of carrying it to the breaking point.

The energy that is absorbed by the sample while impacting could also be considered as toughness which is calculated according to the maximum height that the pendulum reaches after impacting.

This test can be performed on samples with or without notching.

Mechanical testing: Durometer (Shore A-D)

The Durometer (ISO 868) is a lab instrument involved in measuring material hardness.

This instrument consists in penetrating material and the range of results goes from 0 that states maximum penetration to 100 which means that sample has not been penetrated at all.

Shore A scale is commonly involved in measuring but when results reach over the 90 Shore A index it is recommended to switch to Shore D scale because it involves a sharper penetrating element.

These instruments are meant to determine the hardness of rubber, thermoplastic elastomers and similar materials.

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