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Using Selected solid boundaries connects the selected boundaries in their entirety to the shell.
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If you select Distance from shell midsurface, enter a Distance d. This value is used instead of the half the shell thickness for defining the connection distance.
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The Rigid version of the coupling only adds constraints to the boundary of the solid, which in general causes local disturbances of the stress field, since the thickness cannot change.
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When using the Flexible coupling, three extra degrees of freedom are added along the shell edge. This allows for a more accurate description of the transition, but the model can in some cases become unconstrained if the mesh on the solid is very coarse.
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When Shell properties is selected, the distance is based on the shell thickness and offset, so that a distance equal to half the shell thickness is used.
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If you select Solid-shell geometrical distance, the connection distance is computed from the geometrical distance between the selected boundaries.
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When there are many interconnected constraints, it may also be useful to change Null-Space Function to Orthonormal or Explicit — Orthonormal, but doing so may increase the memory consumption significantly.
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An example of couplings between shells and solids is shown in Connecting Shells and Solids: Application Library path Structural_Mechanics_Module/Beams_and_Shells/shell_solid_connection
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