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Extracting Poisson's Ratio

Extracting Poisson's Ratio

Extracting Poisson's Ratio

(OP)
I am interested in extracting the overall Poisson's ratio of an object.  The object is made of different materials with different properties.  What I've been doing is a uniaxial tension test and using field output for the U variable to determine the change in length for each dimension, but so far this technique has not worked.  Any suggestions on a better way?

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