Mechanical Properties Of Metals : Strength and hardness - Printable Version

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Mechanical Properties Of Metals : Strength and hardness - sumit patni - 07-26-2014

Strength

Strength is the property that enables a metal to to resist deformation under load The ultimate strength is the maximum strain a material can withstand.

Tensile strength is a measurement of the resistance to being pulled apart when placed in a tension load.

Fatigue strength is the ability of material to resist various kinds of rapidly changing stresseS and is ex­pressed by the magnitude of alternating stress for a specified number of cycles.

Impact strength is the ability of a metal to resist suddenly applied loads and is measured in foot-pounds of force.

Hardness

Hardness is the property of a material to resist permanent indenation. Because there are several meth­ods of measuring hardness, the hardness of a material is always specified in terms of the particular test that was used to measure this property.

Rockwell, Yickers, or Brinell are some of the methods of testing. Of these tests, Rockwell is the one most frequently used.

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