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Absorbed embedded region

*Embedded region, absorbed
<embedded element set>, <embedded node set>, <host element set>

Use this option to embed elements from <embedded element set> into elements from <host element set> such that the embedded elements do not contribute to the global stiffness matrix.

The degrees of freedom of the embedded nodes are fully constrained using interpolation based on the shape functions of the host elements. As a result, the embedded nodes follow the displacement field of their respective host element location without adding any mechanical resistance.

This approach is suitable for:

  • Visualising structural components or inclusions that follow host deformation.
  • Embedding markers, inactive reinforcements, or post-processing features.

Details on the implementation are provided in the Theory Manual.

Only nodes that are geometrically located within the volume or on the surface of host elements are embedded. Nodes located outside the host elements are treated normally: they remain active in the global system and can be subjected to loads and boundary conditions.

Nodes embedded using the absorbed method do not contribute to the global system of equations. Their stiffness and internal forces are excluded from assembly. Ensure that this behaviour is appropriate for your modelling intent.

Syntax

*Embedded region, absorbed
<embedded element set>, <embedded node set>, <host element set>
  • <embedded element set>: Name of the element set to be embedded.
  • <embedded node set>: Name of the node set whose degrees of freedom are to be constrained.
  • <host element set>: Name of the host element set into which the embedded elements are placed.

Example

*Embedded region, absorbed
inclinometer_elements, inclinometer_nodes, soil

This command embeds elements in the inclinometer_elements set into the soil host set. The nodes from inclinometer_nodes will follow the deformation of the host elements. The embedded inclinometer will not influence the stiffness or stress field of the system.