Machine Design
The maximum normal stress theory is used for

Non-ferrous materials
Plastic materials
Ductile materials
Brittle materials

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Machine Design
The elasticity is the property of a material which enables it to

Retain deformation produced under load permanently
Resists fracture due to high impact loads
Regains its original shape after deformation when the external forces are removed
Draw into wires by the application of a tensile force

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