Modeling Thin Layers
Sometimes, there are thin layers between larger components that cannot be ignored in a structural analysis. The reasons are either because they have significant flexibility or damping properties, or that they may fail. Examples of such layers are glue layers, O-rings, and gaskets. Other cases can involve transition zones between particles or fibers and the binder in a composite material.
When the layer is thin compared to other dimensions of the structure, it is difficult to produce a mesh with acceptable quality without compromising the numerical conditioning of the stiffness matrix. The Thin Layer boundary feature allows to overcome this problem by making simplifications, so that there is no need for a mesh in the through-thickness direction.
There are three different approximations available for modeling thin layers:
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Solid
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Membrane
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Spring
These approximations differ in the simplifications made for obtaining the deformation gradient in the thin layer. For more details see Thin Layers.