Elongation Calculator

Your details

Choose whether to start from measured lengths or from an applied load.
The gauge length of the specimen before any load is applied.
mm
The gauge length after load, typically measured at the fracture point for elongation-at-break tests.
mm
Select a material to compare your elongation result against its typical elongation at break.
Percent elongationModerate elongation
14%

Change in length as a percentage of the original length

Change in length (ΔL)7
Engineering strain (ε)0.14
True strain (ε_true)0.131028
Elongation at break (material)20%
Safety ratio0.7
0.7 x limit
Safe<0.5Moderate0.5-0.8Near limit0.8-1Exceeds fracture1+

Percent elongation: 14.00 %

  • Engineering strain is 0.1400 (dimensionless). True (logarithmic) strain is 0.1310.
  • At 14.00 %, you are at 70.0 % of the typical elongation at break for Mild Steel (20.0 %).
  • True strain (logarithmic) is more accurate than engineering strain for large deformations because it accounts for the continuously changing gauge length.

Next stepTo calculate deformation from a known load, switch to the Axial Deformation mode and enter force, area, and Young's modulus.

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