User is trying to use the probe tool to get reactions at a contact pair between two rigid bodies in workbench, but the answer is always zero. Is this a bug? Is there a workaround?
This is not a bug. It is a documented limitation. The way the probe tool calculates the contact reaction at contact element type 9 (for example) is as follows: esel,s,real,,9 esel,r,type,,9 nsle esln esel,u,ename,,170,175 !*** eliminate contributions of contact elements *** fsum In other words, Simulation does not fetch reactions from the contact elements but rather from the non-contact elements who share nodes with the contact elements. For a contact pair between rigid bodies, no non-contact elements passed the (above) test. Hence, results are always zero. The workaround is to insert a command object to use either FSUM or ETABLE as follows: (refer to contact element documentation for NMISC numbers via ETABLE) !FSUM approach !************** set,,,,,1 ESEL,S,TYPE,,9 nsle,s,1 fsum,,both !*************** !ETABLE approach !*************** esel,s,type,,9 nsle,s,1 ETABLE,FZ9,NMISC,45 !contact force in z direction PRETAB,FZ9 !************** |
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