- Mapdl.tbfield(type_='', value='', **kwargs)¶
APDL Command: TBFIELD
Defines values of field variables for material data tables.
Type of field variable:
FREQ - A frequency is to be specified in Value
TEMP - A temperature is to be specified in Value
TIME - A time is to be specified in Value
NPRES - A normal pressure is to be specified in Value
SLDA - A total sliding distance (algebraic) is to be specified in Value
SLDI - A total sliding distance (absolute) is to be specified in Value
SLRV - A sliding velocity is to be specified in Value
CYCLE - A healing cycle number is to be specified in Value
UFXX - User-defined field variable (UF01,UF02, …, UF09)
The field value to be referenced (use this command multiple times to enter values of different field variables).
Define your data tables as field-variable-dependent (via the appropriate TB command shown below), then issue the TBFIELD command to define the field values.
Define data values in ascending order for all field quantities. If a field value is to be held constant, define it only once; subsequent definitions are ignored.
There is no limit on the number of values you can specify. The specified field value remains active until the next TBFIELD command is input.
After you have defined the field value(s), define your data for the data tables (TBDATA).
See Understanding Field Variables in the Material Reference for more information about the interpolation scheme used for field-dependent material properties.
See Full Harmonic Analysis in the Structural Analysis Guide for more information about using TBFIELD with TB,ELASTIC or TB,SDAMP.
The TBFIELD command supports the following material models (TB,Lab commands):
The TEMP value specified on this command corresponds to the average temperature on the contact surface for contact elements CONTA171, CONTA172, CONTA173, CONTA174, CONTA175, CONTA176, and CONTA177. For contact element CONTA178, the TEMP value corresponds to the average temperature of the nodes.
The TIME value specified on this command corresponds to the analysis time specified on the TIME command.
The algebraic sliding distance (SLDA) specified on this command is the total sliding distance (the algebraic sum) as reported in the element output definitions table for the contact elements (for example, TASS and TASR output items for CONTA174).
The absolute sliding distance (SLDI) specified on this command is the total accumulated sliding distance (the absolute sum) as reported in the element output definitions table for the contact elements (for example, AASS and AASR output items for CONTA174).
When used with TB,FRIC, field variables defined by TBFIELD are only available for isotropic friction (TBOPT = ISO) and orthotropic friction (TBOPT = ORTHO); they are not available for user-defined friction (TBOPT = USER).
See Contact Friction in the Material Reference for more information about using TBFIELD with TB,FRIC.