Can I include frequency-dependent material properties in Workbench Mechanical?
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Yes. Perhaps the easiest thing to do is to place one Commands object beneath each body for which you want to modify material properties. An example of these commands have been included below, but please review the commands carefully with the help of the Commands Reference. When these commands are executed, there will be a variable called MATID, which you can reference to modify the materials for that body. Any existing stiffness values are deleted and replaced with frequency-dependent stiffness and damping. You simply repeat the TBFIELD and TBDATA commands for additional frequencies. Since these properties are in a fixed unit system, it is recommended to set the solver units (under Analysis Settings) to your unit system. ! TB, Lab, MAT, NTEMP, NPTS, TBOPT, EOSOPT, FuncName ! TBFIELD, Type, Value ! TBDATA, STLOC, C1, C2, C3, C4, C5, C6 ! you may want to set the solver units (Analysis Settings) to match whatever units you use here ! delete the existing elastic properties mpdele,ex,MATID mpdele,nuxy,MATID ! TB,ELASTIC to define Isotropic Properties tb,elastic,MATID tbfield,freq,10 tbdata,1,2.1e8,0.31 tbfield,freq,20 tbdata,1,2.2e8,0.32 tbfield,freq,30 tbdata,1,2.3e8,0.33 tbfield,freq,40 tbdata,1,2.4e8,0.34 tbfield,freq,50 tbdata,1,2.5e8,0.35 ! TB,SDAMP to define Structural Damping Coefficient ! SDAMP specifies damping in terms of the loss factor, ! which is equal to 2 times the damping ratio. tb,sdamp,MATID tbfield,freq,10 tbdata,1,0.191 tbfield,freq,20 tbdata,1,0.192 tbfield,freq,30 tbdata,1,0.193 tbfield,freq,40 tbdata,1,0.194 tbfield,freq,50 tbdata,1,0.195 |
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