Following the theory of elasticity, the strengths in a differential volume can be expressed in global axes by this tensor:
It is always possible to find another base X'Y'Z', different for every node, where the tensor is represented as:
These are the eigenvalues of the matrix and the new base is made with the eigenvectors. Its values represent the maximum and the minimum strengths values for that point of the solid.
It is possible to see these values with:
View results -> Strengths -> Si-strengths
or Sii-strengths or Siii-strengths
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