The notch in the sample affects the results of the impact test,[REF] thus it is necessary for the notch to be of regular dimensions and geometry.
The "Standard methods for Notched Bar Impact Testing of Metallic Materials" can be found in ASTM E23,[REF] ISO 148-1[REF] or EN 10045-1,[REF] where all the aspects of the test and equipment used are described in detail.