Machine Design
The maximum normal stress theory is used for

Ductile materials
Non-ferrous materials
Plastic materials
Brittle materials

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

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

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