Following the theory of elasticity, the axial force is represented in a given base X'Y' by this tensor:
It is always possible to find another base X''Y'' 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 axial value for that point of the shell.
It is possible to see these values with:
View results -> Main axial force -> both
Note: As the local axes system for the main axial forces change from element to element, in some cases where this change is too big the smoothing in the contour fill is not being done. For this reason, some discontinuities of the results can be appreciated.
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