IZOD IMPACT TEST



The Izod test is another form of impact testing. It also involves the use of a vee notched specimen and a machine to deliver an impact blow to the specimen. Testing is generally carried out with the specimens at room temperature since the time required to accurately place it in the machine allows its temperature to increase. This can introduce a significant error when conducting tests at various temperatures.


The positioning of the specimen within the testing machine is critical. Unlike the Charpy specimen, the Izod specimen is held rigidly in a vice type fixture with the notched side facing the direction of impact. The centerline of the notch must be in the plane of the vice top within .125 mm. Once the specimen is in place the hammer is released from a preset height and allowed to strike the specimen thus fracturing it at the vee notch.

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