The basic mechanical properties of materials such as hardness, ductility and strength depend on their internal structure. Therefore, the internal structure and properties of the materials should be well known. The determination of these properties can be made by some mechanical tests.

The tensile and compression strength of the materials are determined by the resistance they show to the applied loads. The tensile strength of the materials is determined by the resistance they show against the impacts applied. The resistance of the materials against bending is determined by the resistance they show against the force applied between the two support parts.