Principal Stress from Shell view


I have a question related to the principal stress resulting from shell analysis. As far as i know, for a 3D stress state, there will be sig 1, sig 2 and sig 3. But in Karamba, there are only first principal stress and second principal stress. where is the thrid one then? Does Karmaba neglect sig2 because it is too small in a 3D stress state?

Hi @yankees619267333,
in Karamba3D a plane stress state for shells is assumed. This means the third principal stress (oriented in transverse direction) is zero. Therefore only the in-plane principal stresses are output.
ā€“ Clemens