"Hardness" describes the static state of the object, that is to say, the test of hardness is not impact test, but static pressure test, load uniform increase! The above mentioned power also refers to plastic deformation rather than breaking!!

Whether the object is easy to break, this test is the impact test, the actual test is toughness.

Hardness is the ability of a material to resist hard objects pressing into its surface. It is one of the important performance indexes of metal materials. General hardness is taller, wear resistance had jumped over. Commonly used hardness indicators are Brinell hardness, Rockwell hardness and Vickers hardness.

See: Hardness yingdu [hardness] generally refers to the degree of hardness of something

In general, hardness refers to the resistance of a material to plastic deformation, but there are many other definitions, and several different definitions of hardness are based on the design classification that we use today.

1 by static or dynamic action of residual deformation of indentation resistance, indentation hardness such as: Brinell, Rockwell, Vickers and other types of hardness test.

2. The degree of energy absorption of impact load is called rebound hardness, such as The Shaw hardness test.

3. Resistance to scratch (scratch) is scratch hardness, such as: Mohs, field scratch and filing test.

4. Resistance to wear is abrasion hardness, such as abrasion test.

5. Resistance to cutting or drilling is known as cutting hardness or machinability, e.g. cutting hardness test, etc.