Engineering Materials
Ductility of a material can be defined as

Ability to recover its original form
Ability to undergo large permanent deformations in tension
All of these
Ability to undergo large permanent deformations in compression

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Engineering Materials
Stress relaxation is the phenomenon

In which deformation tends to loosen the joint and produces a stress reduced
Stress reduces on increasing load
In which parts are not loaded
In which stress remains constant on increasing load

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