Machine Design
When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads

Combined loads
Shear
Tension
Compression

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

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
Retain deformation produced under load permanently

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