poissons ratio can be negative. it varies from -1 to 0.5. E = 2G(1+(1/m)). E AND G cannot be zero. so if we make the bracketed term equal to zero, we have (1/m) = -1. like wise E = 3K(1-(2/m)). which gives (1/m) = 0.5. therefore poissons ratio varies from -1 to 0.5
Poisson's ratio for a cork is almost zero. Yes Poisson's ratio can be negative. Such materials are called auxetics. Eg. Human ligaments
ReplyDeleteFor further info: http://en.wikipedia.org/wiki/Auxetics
poissons ratio can be negative. it varies from -1 to 0.5.
ReplyDeleteE = 2G(1+(1/m)). E AND G cannot be zero. so if we make the bracketed term equal to zero, we have (1/m) = -1.
like wise E = 3K(1-(2/m)). which gives (1/m) = 0.5.
therefore poissons ratio varies from -1 to 0.5