If an interface which is active on boundaries (Shell or Membrane in 3D for example) is added on the same interior boundary as a Thin Elastic Layer, then the virtual slit between the two sides of the boundary may be closed again. This happens if the domain interface and the boundary interface share the same displacement degrees of freedom.
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1
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Choose an auxiliary direction. Unless the normal to the layer is very close to the global X direction, use . If the X direction cannot be used, the Y direction is instead used as the auxiliary direction, .
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2
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The local y direction is obtained from the part of the auxiliary direction which is orthogonal to the normal direction n:
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3
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Springs and Dampers in the Structural Mechanics Modeling chapter.
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