Plot > Strain > εoct Octahedral Shear Strain
Plot > Strain > εvol Volumetric Shear Strain
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Contours the octahedral shear strain
εoct = ¹/3 [ (ε1 - ε2)² + (ε2 - ε3)² +(ε3 - ε1)² ]½
and the volumetric strain
εvvol = (ε1 + ε2 + ε3)
These components can be accessed via the Strain Components toolbar as follows:
This toolbar can be changed to a vertical orientation by dragging is against either the right or left hand edge of the main window. It can be changed back to a horizontal orientation by dragging is against either the top or bottom edge of the main window.
Selecting the You can add this button to the Contours toolbar using the configuration
In elastic analysis the major principal stress is normally used with the minor principal stress and the Mohr-Coulomb or Hoek-Brown strength criterion to estimate the amount of damage due to over-stressing.
By contrast, in non-linear analysis the stresses can never exceed the strength unless some creep is used. In this latter case, viscous creep can allow stress states above the failure criterion, thus indicating a lack of static equilibrium. Hence for non-linear analysis one normally directly considers the amount of non-linear strain or the strain rate predicted by the model
Note that there are three components of strain that can be contoured:
There are also two different ways of presenting the strain:
The contour range is set using
This component can be added to the contour toolbar if desired
The user may find it handy to add the
button to the contouring toolbar for quick access to all strain components.
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button on the 
