*GAP DIFFUSIVITY

Products Abaqus/Standard

Type Model data

LevelModel

Required parameters

TYPE

Set TYPE=ION CONCENTRATION to define the contact diffusivity, $D_{g}$ , for ion concentration.

Set TYPE=SPECIES CONCENTRATION to define the contact diffusivity, $D_{g}^{s}$ , for species concentration.

Optional parameters

CUTOFF FLOW ACROSS: Set this parameter equal to a cutoff clearance distance above which no ion or species diffusion occurs across a contact interface.
CUTOFF GAP FILL: Set this parameter equal to a cutoff clearance distance above which no ion or species diffusion occurs into or out of a contact interface due to changes in the clearance distance.
DEPENDENCIES: Set this parameter equal to the number of field variables on which the contact diffusivity, $D_{g}$ or $D_{g}^{s}$ , depends.

Data lines to define the contact diffusivity, $D_{g}$ , directly for TYPE=ION CONCENTRATION

First line

Contact diffusivity, $D_{g}$ . (Units of T^–1L.)
Contact pressure, $p_{c o n t a c t}$ .
Average ion concentration, $\bar{C_{e}}$ .
Average temperature, $\bar{θ}$ .
Average value of the first field variable, $\bar{f_{1}}$ .
Average value of the second field variable, $\bar{f_{2}}$ .
Etc.

Repeat this data line as often as necessary to define the dependence of contact diffusivity on the contact pressure, average surface ion concentration, average surface temperature, and the average of any predefined field variables on the surfaces.

Data lines to define the contact diffusivity, $D_{g}^{s}$ , directly for TYPE=SPECIES CONCENTRATION