Short definition of young's modulus?

[benhorris]

Can somebody give me a short defination of youngs modulus?

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

 

[Pyrrhus]

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

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

 

[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).

 

[benhorris]

Ok thanks guys. Great help, :-)