HARDNESS TEST

            The hardness of material is its resistance to penetration under a localized pressure or resistance to abrasion. The hardness can be determined by any one of the following tests.

(a) Indentation (or) Penetration test:

1. Brinell
2. Vicker's
3. Rockwell.

(b) Rebound test.

(c) Scratch test.

DESTRUCTIVE TESTS (MECHANICAL TESTS)

             As the name suggests, Destructive testing (DT) includes methods where your material is broken down in order to determine mechanical properties, such as Strength, Toughness and Hardness. In practice it means, for example, finding out if the quality of a weld is good enough to withstand extreme pressure or to verify the properties of a material.

              The following important mechanical tests give valuable information about metals and alloys as given below:

1	Tensile test	tensile strength, yield strength, elastic limit, young’s modulus, Ductility, toughness etc
2	Impact test	toughness of a material under shock loading condition.
3	Hardness test	wear resistance, indentation resistance, scratch resistance or cutting ability  of material.
4	Fatigue test	Behavior of a material under repeatedly applied stress and its endurance limit.
5	Creep test	Behavior of a material under a steady load over a long period of time and creep limit of a material.