Find Poisson's Ratio

1. Sep 4, 2009

JPKelly

1. Torsion test showed aluminum to have shear modulus of 4.60x10^6psi. Under a tensile test, the same specimen showed a modulus of elasticity of 12.2x10^6psi. Find Poisson's Ratio.

2. Poisson's Ratio=lateral strain/axial strain

3. The ratio is a function of both strains. The equations for strain do not have any modulus values in them. I'm not asking for a total explanation, but more of a hint would help.

Thanks,
James

2. Sep 4, 2009

CFDFEAGURU

The shear modulus formula will allow you to calculate Poisson's Ratio.

G = E/(2*(1+v))

Where G is the shear modulus, E is the modulus of Elasticity, and v is Poisson's Ratio.

Thanks
Matt

Last edited: Sep 4, 2009
3. Sep 4, 2009

JPKelly

Thank you so much! I actually discovered that shortly after I posted the thread.

Thank you again.
James