Context: For vector quantities such as displacement, velocity, and acceleration, which are derived from nodal coordinates, Abaqus/CAE transforms the results to the requested coordinate system using the final quantity (saved vector) instead of the original coordinates. For example, the cylindrical displacement component is computed by projecting the displacement vector along the current r- or $\theta $- direction. By comparison, taking the differential between the transformed nodal coordinates would yield a different result. When you transform results into a local coordinate system, Abaqus/CAE rotates the global rectangular coordinate system as needed to align with the local system at the point of interest. The transformed results are reported in the rotated global rectangular coordinates. For transformations to user-specified coordinate systems, Abaqus/CAE includes the effects of the current deformation by default when deformation effects are available. You can exclude these effects if you want transformation calculations to consider only the undeformed state. Deformation effects are not scaled; Abaqus/CAE performs these calculations using a deformation scale factor of 1.0. Including deformation effects in a transformation can change the orientation of node-based coordinate systems, the projection of coordinate systems on shell and membrane elements, and the orientation of location-dependent cylindrical and location-dependent spherical coordinate systems. When you select a user-specified coordinate system for a transformation, you can also adjust the display of primary variable results or results from both the primary and deformed variables to account for the rigid body transformation of the coordinate system. Displaying deformations that account for rigid body transformations enables you to visualize the relative displacements of the model with respect to a moving, user-defined coordinate system. For more information about selecting results variables, see Selecting the primary field output variable, and Selecting the deformed field output variable. You can apply angular transformations for coordinate- and distance-based nodal vector results. The angular transformation computes components in terms of R, $\theta $, and Z for cylindrical coordinate systems and in terms of R, $\theta $, and $\varphi $ for spherical coordinate systems. You can apply layup orientation transformations for results that include output from the field output variable SORIENT and include composite sections. This transformation computes tensor and vector fields using the orientation of elements on each individual ply rather than using a single orientation for the entire composite layup. |