ID_PLOT_STRAIN_EOCT   Plot > Strain > εoct   Octahedral Shear Strain

ID_PLOT_STRAIN_VOL   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:

 

 

clip0293

 

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 clip0295 button on the Contours toolbar activates the Stress Components toolbar.

You can add this button to the Contours toolbar using the configuration clip0296 button.

 

clip0297

 

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

 

Mohr-Coulomb in 3D FF blocks

 

Note that there are three components of strain that can be contoured:

 

ID_PLOT_STRAIN_ELASTIC Plot > Strain > Value > Elastic

ID_PLOT_STRAIN_PLASTIC Plot > Strain > Value > Plastic

ID_PLOT_STRAIN_TOTAL Plot > Strain > Value > Total

 

There are also two different ways of presenting the strain:

 

ID_PLOT_STRAIN_INDUCED Plot > Strain > Value > Induced Strain

ID_PLOT_STRain_ABSOLUTE Plot > Strain > Value > Absolute Strain

 

The contour range is set using

 

ID_RANGE Plot > Range

 

This component can be added to the contour toolbar if desired

 

ID_VIEW_BAR_OPTIONS Tools > Configure Contouring Toolbar > Strain

 

The user may find it handy to add the

 

ID_PLOT_STRAIN_SPECIAL More Strain Components

 

button to the contouring toolbar for quick access to all strain components.