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<clamp_shells> function for Rigid Bounday Condition
This flag was originally intended to allow a shell to connect to a rigid body only along its front face nodes, leaving back face nodal degrees-of-freedom free. But this flag is being overridden internally because (at some point in time, after introducing <clamp_shells>) we found an odd behavior regarding mesh locking when we fix only front-face nodes to a rigid body. So, for now, this flag does nothing: Front and back-face nodal displacements of shells are always clamped to a rigid body when that rigid boundary condition is requested.
If you want to model shells that only have front face nodes attached to a rigid body (i.e., if you want the shell to freely rotate), use a rigid revolute joint to connect the two bodies.
For now, I have hidden this parameter, so it will not show up in FEBioStudio, but remains available for backward compatibility. Files created with that flag will open with a warning, but otherwise nothing should change.
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