Thin Layer
Use the Thin Layer node to apply elastic and damping conditions between two parts on interior boundaries, or a thin cladding on external boundaries to a solid.
Boundary Properties
Select a Thin layer type — Nonlayered or Layered.
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For Nonlayered (the default), enter the thin layer Thickness Lth.
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For Layered, and when Use all layers is selected, all information is taken from the definitions made in the Single Layer Material, Layered Material Link, or Layered Material Stack nodes under the Materials node in the current component.
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For Layered, and when Use all layers is not selected, the Layered material list is displayed. You can select from the current component:
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 Any Single Layer Material available under the Materials node.
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Any Layered Material Link available under the Materials node.
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 Any Layered Material Stack available under the Materials node.
In the COMSOL Multiphysics Reference Manual: Single Layer Materials, Layered Material Link, and Layered Material Stack
Thin Layer
Select the thin layer Approximation — Solid, Membrane, or Spring. Only the Solid approximation is available for Layered structures.
By adding the following subnodes to the Linear Elastic Material, Nonlinear Elastic Material, or Hyperelastic Material nodes you can incorporate many effects in thin layers:
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Thermal Expansion (for Materials)
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Hygroscopic Swelling
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Initial Stress and Strain
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External Stress
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External Strain
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Inelastic Strain Rate
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Damping
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Viscoelasticity
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Plasticity
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Creep
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Viscoplasticity
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Mullins Effect
The Thin Layer node and subnodes are only available with some COMSOL products (see https://www.comsol.com/products/specifications/).
The Thin Layer node is available in 3D, 2D, and 2D axisymmetry.
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Modeling Thin Layers in the Structural Mechanics Modeling chapter.
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Theory for Thin Layers in the Structural Mechanics Theory chapter.
Location in User Interface
Context Menus
Solid Mechanics>Thin Layer
Ribbon
Physics tab with Solid Mechanics selected:
Boundaries>Thin Layer