In tensile testing, how is percentage elongation at break which is measure of ductility is expressed as universally ? Is it (displacement/gage length)*100 or (change in length/gage length)*100 ? Say, displacement is 2 mm and gage length is 130 mm, then according to former equation, percentage elongation is 1.5% and as per latter, it is 101.5%.
Hello Muralishwara,
The % elongation is measured as follows:
(change in length(elongation)(ΔL)/original length (L)(gage length))*100
Where,change in length (ΔL)= (Lbreak) increased in length at break - Original length (L)(gauge length), which is actually displacement only with respect to gauge length.
Follow Handbook of Plastics Testing and Failure Analysis by Vishu Shah.
the elongation is the length increase, i.e., the change in length. In your example, the percentage elongation is 1.5%
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