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Recognition of the influence of temperature, strain rate and distribution of stresses on the toughness of metals has led to development of several test methods. The initial testing methods were carried out at room temperature, however in present day the lowering of temperature is possible with especial baths.

Most of the later developments are named after the originators of the test methods like Charpy, Izod and Mesnager. The Charpy and Izod methods are industrially more acceptable tests, and they use notched specimen.