Q. User is trying to model two offset surfaces, meshed with shell elements and tied together by MPC contact.
The simulation does not account for the bending moment that develops due to the offset. Is this a code defect or a limitation?
A. This is a limitation of default MPC contact. The solution is to set KEYOPT(5)=3 for the TARGE170 elements of the subject MPC contact pair. In workbench, add a command object to the contact pair to execute "KEYOPT,tid,5,3", where tid is the TARGE170 element type number. This switches the DOF set in the CEs to shell-to-solid. Hence, when the constraint equations are created, all six DOFs are used on the contact side of the pair, while only the translational DOFs are used from the target side. This has the effect of including bending due to offset. Unfortunately, we do not say this clearly in the documentation. A clarifying note will be added to the Contact Technology Guide at 11.0.
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Q. User is trying to model two offset surfaces, meshed with shell elements and tied together by MPC contact. The simulation does not account for the bending moment that develops due to the offset. Is this a code defect or a limitation? A. This is a limitation of default MPC contact. The solution is to set KEYOPT(5)=3 for the TARGE170 elements of the subject MPC contact pair. In workbench, add a command object to the contact pair to execute "KEYOPT,tid,5,3", where tid is the TARGE170 element type number. This switches the DOF set in the CEs to shell-to-solid. Hence, when the constraint equations are created, all six DOFs are used on the contact side of the pair, while only the translational DOFs are used from the target side. This has the effect of including bending due to offset. Unfortunately, we do not say this clearly in the documentation. A clarifying note will be added to the Contact Technology Guide at 11.0. |
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