ansys.mapdl.core.Mapdl.pdef#
- Mapdl.pdef(lab='', item='', comp='', avglab='', **kwargs)#
Interpolates an item onto a path.
Mechanical APDL Command: PDEF
- Parameters:
- lab
str
Label assigned to the resulting path item (8 characters maximum). This item may be used as input for other path operations.
- item
str
Label identifying the item for interpolation. Valid item labels are shown in PDEF - Valid Item and Component Labels below. Some items also require a component label.
- comp
str
Component of the item (if required). Valid component labels are shown in PDEF - Valid Item and Component Labels below.
- avglab
str
Option to average across element boundaries:
AVG
- Average element results across elements (default).NOAV
- Do not average element results across elements. If the parameterDISCON
= MAT on the pmap command, this option is automatically invoked.
- lab
Notes
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 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).See also Mapping Results onto a Path
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[ PDEF_temp ]
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 3D models only.
CONT
STAT PDEFcontstat
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
andSHELL132
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