Commonly used method has hardness of cloth family name (HB) , Rockwell hardness (HRA, HRB, HRC) with diamond pyramid hardness (HV) wait for a method.

4. Fatigue

The intensity that discusses in front, plasticity, hardness is the mechanical function index that the metal leaves in dead load action. Actually, a lot of machine spare partses work below circular load, below this kind of condition the spare parts can produce exhaustion.

5. Pound tenacity

With action of very old rate the load on parts calls concussion load, the metal resists below concussion load action destructive ability calls concussion tenacity.