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poisson ratio for membrane

Constitutive equations for membrane element

Submitted by Yasheng Chen on
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Hi all,

 There are two poisson ratios for membrane element in Abaqus.  One is for the material and the other one is "effective section poisson ratio", which can be set to zero to fix the thickness of the membrane.  Does anyone know how these two Poisson ratios work in the constitutive equation of a membrane?

 Thank you very much!

 Yasheng