impact test

Impact test            The test to determine the impact load resistance of metal materials is also called impact toughness test. It is one of the basic test methods of material mechanical property test. In the impact test, the work consumed by punching the specimen is called the impact energy, which is expressed in joules (J) in a. Divide a by the cross-sectional area f at the notch of the sample, and obtain a / F =. Its unit is Joule / cm ((J / cm ()), which is called the material impact value. It can be used to evaluate the toughness and brittleness of materials, but not directly used in design calculation.            According to the specimen shape and fracture mode, impact test can be divided into three types: bending impact test, torsional impact test and tensile impact test.