This option is used to apply surface radiation boundary conditions between a nonconcave surface and a nonreflecting environment in fully coupled thermal-stress analysis or to define an approximate cavity radiation interaction. In Abaqus/Standard it is also used for heat transfer and coupled thermal-electrical analyses.
It must be used in conjunction with the *PHYSICAL CONSTANTS option, which is used to define the Stefan-Boltzmann constant.
Products: Abaqus/Standard Abaqus/Explicit
Type: History data
Level: Step
“Thermal loads,” Section 30.4.4 of the Abaqus Analysis User's Manual
“Cavity radiation,” Section 37.1.1 of the Abaqus Analysis User's Manual
Set this parameter equal to the name of the *AMPLITUDE option that gives the variation of the ambient temperature with time.
If this parameter is omitted in an Abaqus/Standard analysis, the reference magnitude is applied immediately at the beginning of the step or linearly over the step, depending on the value assigned to the AMPLITUDE parameter on the *STEP option (see “Procedures: overview,” Section 6.1.1 of the Abaqus Analysis User's Manual). If this parameter is omitted in an Abaqus/Explicit analysis, the reference magnitude is applied immediately at the beginning of the step.
First line:
Surface name.
Radiation type label R.
Reference ambient temperature value, 
. (Units of 
.)
Emissivity, 
.
Repeat this data line as often as necessary to define radiation conditions for different surfaces.
First line:
Surface name.
Radiation type label AVG.
Leave this field blank.
Emissivity, .
Repeat this data line as often as necessary to define radiation conditions for different surfaces.