Two different materials can be adjacent and share the same set of nodes, then no bonded contact is needed.
Say an I-beam runs along the inside of a wing and the top flat is bonded to the wing skin, but the adhesive bond thickness is not included in the finite element model. Use the inner surface of the wing as the geometry that is meshed. Imprint the I-beam flat onto that surface. Mesh the wing surface with wing skin material and set the element offset to be on the top of the surface. Mesh the flat imprint face of that surface with I-beam material and set the element offset to be on the bottom of the surface. That way, when you turn on thick shells, you will see the wing skin elements adjacent to the I-beam flat elements, and they share the same set of nodes.
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