You can define TCC as a tabular function of contact pressure via APDL commands. Below is an old example. In your case, you would insert these commands in a command object under the contact pair of interest. Also, the first field of the RMODIF command should refer to "cid" for the contact pair real set number, instead of "2" in this example. Please refer also to *DIM and RMODIF command in MAPDL Command Reference manual for more details on proper syntax. It would also be good to refer to the MAPDL Elements Reference Manual for CONTA174 (Table 174.1 and related links) for more background on defining the TCC real constant.
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