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I_am_no1
Jan2-10, 04:14 AM
v = \epsilontrans/ \epsilonaxial

where

ν is the resulting Poisson's ratio,
\epsilontrans is transverse strain
\epsilonaxial is axial strain
and Poissions Ratio have range and its not more then 0.5 and not less then -1?

so my queston is how its value can turn "-1"?

As its already neative and its axial strain or transverse strain one must be negative so the value of Poissions Ratio will turn positive! what do you say!

tiny-tim
Jan2-10, 04:43 AM
Hi I_am_no1! :smile:

These are auxetic materials … see http://en.wikipedia.org/wiki/Auxetic and http://en.wikipedia.org/wiki/Poisson%27s_ratio#Negative_Poisson.27s_ratio_mater ials :wink: