Logarithmic interpolation of temperature dependent creep properties

jjdoylejjdoyle PittsburghMember

In MAPDL, the TBIN command can be used to interpolate creep coefficients on a logarithmic scale. Sometimes this can be helpful with coefficients that span several orders of magnitude between temperatures. The default interpolation is always linear.  In WB-Mechanical, this can only be done with a command object as of Release 2020-R2.

Below is a sample command sequence that shows how to set up the logarithmic scale for creep coefficients C1 and C5.

TBDELE,creep,matid

TB,creep,1,2,7,11

! Interpolate creep property C1 in LOG-LINEAR SCALE

TBIN,SCAL,Temp,1,LOG,LINE

! Interpolate creep property C5 in LOG-LINEAR SCALE

TBIN,SCAL,Temp,5,LOG,LINE

!

TBTEMP,1400

TBFIELD,Temp,400

TBDATA,1,1e-15,0,0,0,1e-40

TBDATA,7,0

!

TBFIELD,Temp,500

TBDATA,1,5.0e-13,3.6,-0.45,0,4.2e-37,14.8

TBDATA,7,0

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