Answer:
In this case, it is insufficient to only set the stiffness type to "orthotropic". You also need to select an orthotropic material model for the material, otherwise the stiffness material is defined singularly.
Error Message when Calculating Orthotropic Timber Plate
When calculating a timber plate as an orthotropic surface, an error message appears saying that the Poisson's ratio must be within a certain interval. What can I do?
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