Considerations in Machine Design Materials

Considerations in Machine Design Materials

   After the general layout of the machine has been determined and the necessary mechanisms chosen or devised, it becomes necessary that the designer select a proper material for each machine member. This involves the consideration of such factors as the engineering properties of the available materials; weight, size and the shape of the machine member as well as the loads that it must carry; cost of the material; cost of fabricating the machine element from each material, usually with several alternative production procedures possible for each material; and any properties of the material peculiar to the use to which the member will be put.

   The major engineering properties of materials which important to designer is the strength, stiffness, ductility, toughness, resilience, fatigue resistance, shock resistance, wear resistance, hardness, machinability, effects of high and low temperature, visual appearance and vibrational properties.

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