Finding Poisson's ratio of 3D model in ANSYS

Question

I want to find the Poisson's ratio of a 3D model, not the material but the model. How can I do this in ANSYS workbench?
I am using this formula, but I can't get it to work with different models. I am not sure what strain is the correct to use, can someone point me in the correct direction?
$$nu=-frac{text{Strain in direction of load}}{text{Strain at right angle of load}}$$
$$nu=-frac{varepsilon_{lateral}}{varepsilon_{axial}}$$

Chemomechanics · Accepted Answer

Are you asking which of the two equations you give to use? In the context of a continuous material, the first one is flipped; the second is correct. However, since you're trying to apply a materials concept to a distributed structure, you can't use the strain that ANSYS will output, because this will be the material strain. Better to use $$nu=-frac{frac{mathrm{displacement; between; two; points;A;and;B;spaced;at;a;right;angle;to;the;load}}{mathrm{original;distance; between; points;A; and;B}}}{frac{mathrm{displacement; between; the;two; points;of;load;application;C;and;D}}{mathrm{original;distance; between; points;C;and;D}}}$$

Correct answer by Chemomechanics on April 19, 2021

user29856 · Answer

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Finding Poisson's ratio of 3D model in ANSYS

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