Material property of a solid body measuring as

proportionality coefficient between tensile stress $\begin{array}{l}\sigma\end{array}$ (force per unit area) and axial strain $\begin{array}{l}\epsilon\end{array}$ (proportional deformation) in the linear elastic region of a material:

(1)	$\begin{array}{l}\displaystyle E' = \frac{E}{1-\nu^2}\end{array}$

where

$\begin{array}{l}E\end{array}$	Young modulus
$\begin{array}{l}\nu\end{array}$	Poisson's ratio

It has a meaning of proportionality coefficient between plane stress and plane strain under plane stress conditions (when stress vector is zero across a particular plane).

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Plane Stress modulus = E'

See Also