PDEF, Lab, Item, Comp, Avglab
Interpolates an item onto a path.
LabLabel assigned to the resulting path item (8 characters maximum). This item may be used as input for other path operations.
ItemLabel identifying the item for interpolation. Valid item labels are shown in Table 206: PDEF - Valid Item and Component Labels below. Some items also require a component label.
CompComponent of the item (if required). Valid component labels are shown in Table 206: PDEF - Valid Item and Component Labels below.
AvglabOption to average across element boundaries:
AVG | — | Average element results across elements (default). |
NOAV | — | Do not average element results across
elements. If the parameter |
Defines and interpolates a labeled path item along a predefined
path (PATH). Path item results are in the global
Cartesian coordinate directions unless transformed (RSYS). A path item must be defined before it can be used with other
path operations. Additional path items may be defined from the PVECT, PCALC, PDOT, and PCROSS commands. Path items may be listed
(PRPATH) or displayed (PLPATH, PLPAGM). A maximum number of path items permitted
is established by the nSets argument specified
with the PATH command.
When you create the first path item (PDEF or PVECT), the program automatically interpolates four path items which are used to describe the geometry of the path. These predefined items are the position of the interpolated path points (labels XG, YG, and ZG) in global Cartesian coordinates, and the path length (label S). For alternate methods of mapping the path geometry (to include, for example, material discontinuity) see the PMAP command. These items may also be listed or displayed with the PRPATH, PLPATH, and PLPAGM commands.
If specifying that load case operations act on principal/equivalent stresses (SUMTYPE,PRIN), derived quantities (principal and equivalent stresses/strains) will be zero for path plots. A typical use for such a case involves mode combinations in a response spectrum analysis.
The number of interpolation points on the path is defined by
the nDiv argument on the PATH command. See Mapping Nodal and Element Data onto the Path in the Mechanical APDL Theory Reference for details. Use PDEF,STAT to list the path item labels. Use PDEF,CLEAR
to erase all labeled path items, except the path geometry items (XG,
YG, ZG, S).
Table 206: PDEF - Valid Item and Component Labels
| Item | Comp | Description |
|---|---|---|
| Valid item and component labels for nodal degree of freedom results are: | ||
| U | X, Y, Z, SUM | X, Y, or Z structural displacement or vector sum. |
| ROT | X, Y, Z, SUM | X, Y, or Z structural rotation or vector sum. |
| TEMP[1] | Temperature. | |
| PRES | Pressure. | |
| VOLT | Electric potential. | |
| MAG | Magnetic scalar potential. | |
| V | X, Y, Z, SUM | X, Y, or Z fluid velocity or vector sum. |
| A | X, Y, Z, SUM | X, Y, or Z magnetic vector potential or vector sum. |
| CONC | Concentration. | |
| CURR | Current. | |
| EMF | Electromotive force drop. | |
| Valid item and component labels for element results are: | ||
| S | X, Y, Z, XY, YZ, XZ | Component stress. |
| " | 1, 2, 3 | Principal stress. |
| " | INT, EQV | Stress intensity or Equivalent stress. |
| EPTO | X, Y, Z, XY, YZ, XZ | Component total strain (EPEL + EPPL + EPCR). |
| " | 1, 2, 3 | Principal total strain. |
| " | INT, EQV | Total strain intensity or total equivalent strain. |
| EPEL | X, Y, Z, XY, YZ, XZ | Component elastic strain. |
| " | 1, 2, 3 | Principal elastic strain. |
| " | INT, EQV | Elastic strain intensity or elastic equivalent strain. |
| EPPL | X, Y, Z, XY, YZ, XZ | Component plastic strain. |
| " | 1, 2, 3 | Principal plastic strain. |
| " | INT, EQV | Plastic strain intensity or plastic equivalent strain. |
| EPCR | X, Y, Z, XY, YZ, XZ | Component creep strain. |
| " | 1, 2, 3 | Principal creep strain. |
| " | INT, EQV | Creep strain intensity or creep equivalent strain. |
| EPTH | X, Y, Z, XY, YZ, XZ | Component thermal strain. |
| " | 1, 2, 3 | Principal thermal strain. |
| " | INT, EQV | Thermal strain intensity or thermal equivalent strain. |
| EPSW | Swelling strain. | |
| NL | SEPL | Equivalent stress (from stress-strain curve). |
| " | SRAT | Stress state ratio. |
| " | HPRES | Hydrostatic pressure. |
| " | EPEQ | Accumulated equivalent plastic strain. |
| " | PSV | Plastic state variable. |
| " | PLWK | Plastic work/volume. |
| For contact results PowerGraphics is applicable for 3-D models only. | ||
| CONT | STAT2 | Contact status. |
| " | PENE | Contact penetration. |
| " | PRES | Contact pressure. |
| " | SFRIC | Contact friction stress. |
| " | STOT | Contact total stress (pressure plus friction). |
| " | SLIDE | Contact sliding distance. |
| " | GAP | Contact gap distance. |
| " | FLUX | Total heat flux at contact surface. |
| TG | X, Y, Z, SUM | Component thermal gradient or vector sum. |
| TF | X, Y, Z, SUM | Component thermal flux or vector sum. |
| PG | X, Y, Z, SUM | Component pressure gradient or vector sum. |
| EF | X, Y, Z, SUM | Component electric field or vector sum. |
| D | X, Y, Z, SUM | Component electric flux density or vector sum. |
| JC | X, Y, Z, SUM | Component conduction current density or vector sum (for elements that support conduction current calculation) |
| H | X, Y, Z, SUM | Component magnetic field intensity or vector sum. |
| B | X, Y, Z, SUM | Component magnetic flux density or vector sum. |
| CG | X, Y, Z, SUM | Component concentration gradient or vector sum |
| DF | X, Y, Z, SUM | Component diffusion flux density or vector sum |
| FMAG | X, Y, Z, SUM | Component electromagnetic force or vector sum. |
| ETAB | Lab | Any user-defined element table label (see ETABLE command). |
| BFE | TEMP | Applied and calculated temperatures along a defined path. |
| SPL | Sound pressure level. | |
| SPLA | A-weighted sound pressure level (dBA). | |
For SHELL131 and SHELL132 elements with KEYOPT(3) = 0 or 1, use the labels TBOT, TE2, TE3, ..., TTOP instead of TEMP.
For more information on the meaning of contact status and its possible values, see Reviewing Results in POST1 in the Contact Technology Guide.