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Hardness Testing Essay

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DEFINITION OF IMPORTANT TERM

• Hardness : Hardness is the property of resisting penetratiom or permanent distortion. The hardness of a piece of metal can be increased by hammering , rolling, or working otherwise on it. It can be increased by heat treatment such as diffusion treatment of steel.
• Brittleness : Brittleness is the property of resisting a change in the relative position of molecules or the tendency to fracture without the change of shape . In plane construction , it is advisable to avoid the use of too brittle materials as they can cause failure when subjected to shock load.
• Ductility : Ductility is the property of materials (metals) which allows them to be drawn out without breaking. This property is essential in manufacture …show more content…

The specimen has different dimensions and may responded to heat treatment better, or it may have been taken from a different location , or it may not have been subjected to the same fabricating stresses as the manufactured article. It is apparent that some means is needed to check the comparative strength of manufactured articles without destroying or harming them in any way. The development of a hardness test has solve this problem. There are four methods in general use for determining the hardness of metals : Brinell , Rockwell , Vickers , and Shore …show more content…

All plane materials used must have a good strength to weight ration in the form used and must be thoroughly reliable to eliminate any possibility of dangerous or unexpected failure.
In addition to these general properties the materials selected for a definite operation should have specific properties that make it suitable for the purpose.
No one material is adaptable for all purposes. A particular aircraft component/part/assembly must be studied from many view points before the best material or the optional material has been selected .
The designer, therefore, must possess the knowledge of all available plane materials or the optional material has been selected.
Modes of Consideration to be made by designer:
1) Economic

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