What is Elongation?

The elongation I speak of here is the "necking" of the test specimen during the traction test.

Where does the elongation of the test specimen occur?

This necking occurs between the yield strength and the rupture of the test specimen.
Onde ocorre o alongamento do corpo de prova

Elongation is the percentage increase in length of the test specimen "useful part".

What is the practical meaning of elongation?

Elongation is a measure of the ductility of a material.

Briefly, a material that has high elongation in its test specimen during a tensile test is considered ductile ("soft").

Steps in determining percentage elongation

We need to go through four steps:
  • The initial length of measurement (L0) is determined. Details in my article on the traction test test specimen.
  • Conducting the tensile test
  • Join the broken parts for the determination of the final length (L)
  • Calculate the elongation according to the following formula:
Cálculo do alongamento percentual

The result is given in %.

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Materials: What is Elongation?
What is Elongation?
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