11. In the USA, we use the Charpy test to determine the toughness of a material.
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Question
11. In the USA, we use the Charpy test to determine the toughness of a material. In this test, the specimen is loaded as a simple beam with a load and the notch at the middle (see sketch (a) below) In Europe, they use the so-called Izod test. The Izod test is very similar to the Charpy one, except that the configuration is that of a cantilever beam with the notch at the base (see (b)). Can you se any advantage of the Izod configuration over the Charpy one? (This is a thinking question - I did not discuss this in class) la) (hiExplanation / Answer
In both tests namely Charpy and Izod, notch is provided to concentrate stresses at its root, embrittle the material in its vicinity and to raise the elastic limit of the material in this area. When a crack forms at the root of the notch, the stress is greatly intensified and the crack quickly progresses across the section. Without this notch, many compositions would simply bend without fracture, and their total capacity to absorb energy cannot be detected.The sharper the notch the more pronounced are the effects mentioned.
When compared to Charpy,the position of specimen in Izod places the notch at the location of the maximum tension, hence reduces the chances of faliure of the test.
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