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*GAP CONDUCTANCE
Keyword type: model definition, surface interaction
This option allows for the definition of the conductance across a contact pair. The conductance is the ratio of the heat flow across the contact location and the temperature difference between the corresponding slave and master surface. Right now, gap conductance is only taken into account for penalty contact. The gap conductance is a property of the nonlinear contact spring elements generated during contact. This means that heat flow will only take place at those slave nodes, at which a contact spring element was generated. Whether or not a contact spring element is generated depends on the pressure-overclosure relationship on the *SURFACE BEHAVIOR card.
- if the pressure-overclosure relationship is linear a contact spring
element is generated if the gap clearance does not exceed
, where A is the representative area at the slave node, or
if this area is zero (can happen for 2-dimensional elements)
- if the pressure-overclosure relationship is exponential a contact spring
area is generated if the gap clearance does not exceed
(cf. *SURFACE
BEHAVIOR).
The conductance coefficient can be defined as a function of the contact pressure and the mean temperature of slave and master surface. Alternatively, the conductance can be coded by the user in the user subroutine gapcon.f, cf Section 8.4.11. In the latter case the option USER must be used on the *GAP CONDUCTANCE card.
First line:
- *GAP CONDUCTANCE
- Enter the parameter USER if appropriate
Following sets of lines define the conductance coefficients in the absence of the USER parameter: First line in the first set:
- Conductance.
- Contact pressure.
- Temperature.
Use as many sets as needed to define complete temperature dependence.
Example: *GAP CONDUCTANCE 100.,,273.
defines a conductance coefficient with value 
for all contact pressures and all temperatures.
Example files: .
Next: *HEADING Up: Input deck format Previous: *GAP Contents guido dhondt 2011-03-26