Increase in length which occurs before a metal is fractured, when subjected to stress. It is the increase in gauge length (measured after rupture) divided by original gauge length.
This is usually expressed as a percentage of the original length and is a measure of the ductility of the metal.
Higher elongation indicates higher ductility.
Note: Elongation cannot be used to predict behavior of materials subjected to sudden or repeated loading.
Subjects: Mechanical Engineering