Introduce heat conductance between interface surfaces.

This option is used to provide conductive heat transfer between closely adjacent (or contacting) surfaces. It must be used in conjunction with the SURFACE INTERACTION option or in an Abaqus/Standard analysis with the GAP option.

Related Topics
In Other Guides
Thermal contact properties


TypeModel data in Abaqus/Standard; History data in Abaqus/Explicit

LevelPartPart instanceAssemblyModel in Abaqus/Standard; Step in Abaqus/Explicit

Abaqus/CAEInteraction module

Optional parameters


Set this parameter equal to the number of field variables on which the gap conductance, k, depends.


Include this parameter to indicate that k is a function of the contact pressure between the surfaces, p. Omit this parameter to define k as a function of the clearance, d, between the surfaces.


This parameter applies only to Abaqus/Standard analyses.

Include this parameter to define k in user subroutine GAPCON. Using this parameter will cause the DEPENDENCIES and PRESSURE parameters and any data lines to be ignored.

Data lines to define the gap conductance (k) directly

First line
  1. Gap conductance, k. (Units of JT−1L−2 θ−1.)

  2. Gap clearance, d, or gap pressure, p.

  3. Average temperature, θ¯.

  4. In an Abaqus/Standard analysis this data item corresponds to the average mass flow rate per unit area, |m˙|¯. In an Abaqus/Explicit analysis enter a blank field.

  5. Average value of the first field variable, f¯1.

  6. Average value of the second field variable, f¯2.

  7. Etc.

Repeat this data line as often as necessary to define the dependence of gap conductance on gap clearance, gap pressure, average surface temperature, average mass flow rate, and any predefined field variables. At least two data lines must be specified. When gap conductance is defined as a function of clearance, the value of the conductance drops to zero immediately after the last data point; therefore, there is no heat conductance when the clearance is greater than the value corresponding to the last data point.

There are no data lines when the USER parameter is used. Instead, define the gap conductance in user subroutine GAPCON