`epsilon_E = 1/2(1-1/ lambda ^2)`

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The Euler-Almansi Strain is a measure of deformation representing the displacement between particles in the body relative to a reference length. The following formula is used: `epsilon_E=1/2(1-1/lambda^2)`, where:

• `lambda` = stretch ratio

References

Wikipedia (https://en.wikipedia.org/wiki/Deformation_(mechanics))