1. Is smaller than the elastic deformation.
  2. Vanishes.
  3. Is equal to the elastic deformation.
  4. Is much larger than the elastic deformation.
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1 Answers

Option 4 : Is much larger than the elastic deformation.

Concept:

​Ductility: 

  • A metal is said to be ductile when it can be drawn out into wires under tension without rupture. 
  • Wire drawing depends upon the ductility of a metal.
  • A ductile metal must be both strong and plastic.
  • The percentage elongation or percentage reduction in the area before rupture of a test specimen is the measure of ductility. Normally if percentage elongation exceeds 15% the material is ductile and if it is less than 5% the material is brittle.
  • Lead, copper, aluminum, mild steel are typical ductile materials.

Explanation:

  • For a ductile structure, the plastic deformation is much larger than elastic deformation without failure.

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