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Mechanical and Physical Testing
[2] MECHANICAL AND PHYSICAL TESTING
Determination of mechanical properties of material that reveals its elastic and inelastic behaviour when force is applied, thereby indicating its suitability for mechanical applications Properties of a metal or alloy that are relatively insensitive to structure and can be measured without the application of force; for example, density, electrical conductivity, coefficient of thermal expansion, magnetic permeability, and lattice parameter. Does not include chemical reactivity.
Mechanical testing done in AL as below:
Tensile test means, a method of determining the behaviour of materials subjected to uniaxial loading, which tends to stretch the metal. A longitudinal specimen of known length and diameter is gripped at both ends and stretched at a slow, controlled rate until rupture occurs.
UTM machine can be use for the following test
>> Bend test
>> Rebend test
>> Proof load test
>> Compression test
>> Flaring test
UTM machine can give the value of
>> Yield stress
>> Ultimate tensile stress
>> % elongation
>> Reduction percentage area (in %)
UTM machine provide graph of
>> Stress vs strain
>> Load vs displacement
>> Stress vs displacement
Hardness test
Hardness means a measure of the resistance of a material to surface indentation or abrasion; may be thought of as a function of the stress required to produce some specified type of surface deformation.
 
 
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