# Youngs Modulus

1. Nov 2, 2004

### benhorris

Can somebody give me a short defination of youngs modulus?

I think its the way a material acts under pressure, is this correct?

2. Nov 2, 2004

### Pyrrhus

The Young Modulus is proportionality constant between the stress and relative longitudinal deformation. The Young Modulus physical interpretetion is the resistence a solid has against stretching.

$$Y = \frac{\sigma}{\delta L}$$

Last edited: Nov 2, 2004
3. Nov 2, 2004

### PerennialII

Young's modulus for linear-elastic tension / compression, Hookean material in its simplest form (uniaxial deformation like a rod or something like) :

$$E = \frac {\sigma L}{\delta}$$

where $$\sigma$$ is the applied uniaxial stress, $$\delta$$ the displacement and L the length (initial) of the rod or reference in question (so in this form it is essentially a 1D construct with infinitesimal deformations).

4. Nov 2, 2004

### benhorris

Ok thanks guys. Great help, :-)