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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Orthotropic means it is different in different directions. Isotropic means it is the same in all directions. Isotropic equations would be found under the generalize section.--thegreatco (talk) 17:48, 14 May 2008 (UTC)

[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] References

References would be good for the values listed for various materials. — DIV (128.250.204.118 05:59, 14 May 2007 (UTC))

[edit] A bit of humor

The Poisson Conspiracy! http://home.messiah.edu/~tvandyke/podcast5.mp3 153.42.211.95 18:44, 5 October 2007 (UTC)

[edit] Merge

The following discussion is archived. Please do not modify it. Subsequent comments should be made in a new section.

The result was merge POISSON'S EFFECT into POISSON'S RATIO. The merge was proposed almost two months ago (on 19th March). All opinions (the four expressed below and the one of the user who initially proposed it) are in favor of the merge. -- Federico Grigio, alias Nahraana (talk) 17:54, 25 April 2008 (UTC)


Poisson's effect really should get merged in. That page has some good stuff, so it'll take a little thought, but not much. —Ben FrantzDale (talk) 02:10, 29 April 2008 (UTC)

You say the page has good stuff and that you want it to be merged. Now, what is the reason why it should be merged? Federico Grigio, alias Nahraana (talk) 08:08, 1 May 2008 (UTC)
They should be merged because they cover the same topic. Together they contain more details than either one, but the effect and the ratio go hand in hand; the ratio is just a measure of the effect. —Ben FrantzDale (talk) 13:08, 1 May 2008 (UTC)
I see. I agree to merge the articles, because of the same reasons as above. Federico Grigio, alias Nahraana (talk) 08:34, 5 May 2008 (UTC)
I agree, they should be merged. They are taught as one in all my engineering courses. The ratio is the measure of the effect. thegreatco (talk) 17:22, 6 May 2008 (UTC)
Merge it. Greg Locock (talk) 01:58, 12 May 2008 (UTC)
I'll be honest, I've never merged a page and I don't think Poisson's Ratio is the place to start. --thegreatco (talk) 17:44, 14 May 2008 (UTC)


The above discussion is preserved as an archive. Please do not modify it. Subsequent comments should be made in a new section.


Hi. I started merging (deleted some repeated information and copied-pasted two sections).

The section "Calculation of Poisson’s effect" is still left in Poisson's effect. Maybe, someone who likes equations can carefully implant its non-repeated bit into this article.

Federico Grigio, alias Nahraana (talk) 11:31, 15 May 2008 (UTC)

After we finish the merge (when all content has been removed from Poisson's effect) we can place #REDIRECT [[Poisson's ratio]] on it. Federico Grigio, alias Nahraana (talk) 11:35, 15 May 2008 (UTC)