Figure 7.21: SY in Global Cartesian and Cylindrical Systems
Plot 1 (top) illustrat es SY in global Cartesian system. Plot 2 (bottom) illustrat es SY in
global cylindrical system (note that nodes and elements are still in global Cartesian sys-
tem).In a large-deformation analysis--for example, if you have issued the NLGEOM,ON command and the
element has large-deflection capability--the element coordinate system is first rotated by the amount
of rigid body rotation of the element. Therefore, the component stresses and strains and other derived
element data include the effect of the rigid body rotation. The coordinate system used to display these
results is the specified results coordinate system rotated by the amount of rigid body rotation.
The exceptions to this are continuum elements such as PLANE182,PLANE183,SOLID185,SOLID186,
SOLID187,SOLID272,SOLID273, and SOLID285. For these elements, the output of the element component
results is by default in the initial global coordinate system, and all component result transformations
to other coordinate systems will be relative to the initial global coordinate system.
The primary data (for example, displacements) in a large-deformation analysis do not include the rigid
body rotation effect, because the nodal coordinate systems are not rotated by the amount of rigid body
rotation.
7.3.2. Performing Arithmetic Operations Among Results Data
The earlier discussion of operations among path items was limited to items mapped on to a path. Using
commands from the POST1 CALC module, you can perform operations among any results data in the
database. The only requirement is that you must use the element table. The element table serves as a
"worksheet" that allows arithmetic operations among its columns.
The procedure to do calculations among results data requires three simple steps:
- Use the ETABLE command (Main Menu> General Postproc> Element Table> Define Table) to
bring one or more result items into the element table or "worksheet."
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