Part 1 – Problem 04: Since only one Poisson’s ratio value is given, is it assumed that the balsa is isotropic rather than orthotropic or should we be specifying material properties for each principal axis (This is in regards to defining the material properties in SAP/ETABS)?

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Just use the single Poisson’s ratio and assume that the balsa is isotropic. Although this is not entirely accurate, you may make this assumption for simplicity.

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