Talk:Poisson's ratio
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[edit] Large Deformation Formula
Can someone tell me what strain measure is used in the graph showing small vs. large deformation lines for the large deformation formula? - EndingPop 18:18, 18 March 2007 (UTC)
- small deformations assumes that strain is linear (the first derivative is a constant number), large deformation assumes that the strain is not linear (depending on the precision is it not constant up to second or larger "n-th" derivative). If you are talking about "Engineering strain", "true strain", "logarithmic strain" or "lagrange strain" then it is of no importance here: this plot could apply to any of them. The point is that whether you represent strain deformation using a linear or non-liear (more precise) function. Janek Kozicki 20:40, 19 March 2007 (UTC)
[edit] arnt the eqns under orthotropic material true for isotropic?
this should be mentioned. maybe
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[edit] Area?
The definition given is in terms of strain in the transverse direction. But is that the average strain in the plane orthogonal to the stress, or what? —BenFrantzDale 07:14, 20 October 2005 (UTC)
how about a nice little equation to go along with the description...? --alex
[edit] Moved from article
G is actually the Shear Modulus, a materials resistance to a change in shape without a change in volume. G is equal to shear stress, tao, over shear strain, gamma. Tom Harrison Talk 19:50, 24 May 2006 (UTC)
[edit] Formula?
I'd love to see a formula here. It doesn't make sense to not have it there. Can anyone add the formula by which you can use Poisson's ratio? Even if it's on another page, it should be here, too. 132.170.204.103 19:56, 6 July 2006 (UTC)
