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Anisotropic properties in Abaqus: matrix rotation vs local CSYS

Anisotropic properties in Abaqus: matrix rotation vs local CSYS

Anisotropic properties in Abaqus: matrix rotation vs local CSYS

(OP)
Hello all,

I'm currently working on the static electrical analysis of a piezoelectric membrane. Since the elastic, piezoelectric and dielectric properties are anisotropic, one is required to provide Abaqus with a local coordinate system. My question is regarding the difference between giving the solver the non-rotated matrices with a rotated local CSYS (defined by 3 points) or, alternatively, the rotated properties' matrices with the global CSYS (the original system of coordinates). While I had expected to see no difference in running two separate sims with these methodologies (same properties), what I get are very confusing results.
I've actually simplified the analyses since then to involve only the elastic aspect of the problem (no piezoelectric or dielectric matrices), but still the question remains. Am I viewing my results in a wrong way?
If anyone has handled similar issues while treating anisotropic materials, I would be glad to post the .rpy files for both sims here.

Thanks in advance,

Rui Diogo
Aerospace MSc student

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