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laws:echra
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ECHRA
Description
Constitutive law for the heat exchange by mutual radiation between surface elements of solids (for element RAYON)
The model
This law is only used for non linear thermal analysis of solids.
This constitutive law allows to consider heat exchange by radiation between elements pertaining to the surface of a solid.
Files
Prepro: LECHRA.F
Lagamine: ECHRA.F
Availability
| Plane stress state | YES |
| Plane strain state | YES |
| Axisymmetric state | YES |
| 3D state | NO |
| Generalized plane state | YES |
Input file
Parameters defining the type of constitutive law
| Line 1 (2I5, 60A1) | |
|---|---|
| IL | Law number |
| ITYPE | 126 |
| COMMENT | Any comment (up to 60 characters) that will be reproduced on the output listing |
Integer parameters
None
Real parameters
| Line 1 (G10.0) | |
|---|---|
| PLANCK | PLANCK's constant (given in the appropriate system of units) |
Stresses
Number of stresses
2
Meaning (numerical, not physical)
| SIG(1) | heat flow exchanged by radiation neglecting the view factor between the surface elements |
| SIG(2) | same as above but taking account of the view factor between surface elements multiplied by the area |
State variables
Number of state variables
3
List of state variables
| Q(1) | temperature of the first radiating point $(=T_1)$ |
| Q(2) | temperature of the second radiating $(=T_2)$ |
| Q(3) | $\sigma* \left( T_1^3 + T_1^2 T_2 + T_1 T_2^2 + T_2^3\right)$ |
laws/echra.txt · Last modified: 2020/08/25 15:46 (external edit)
