Sweeping a cohesive mesh between bodies

You can use the 3D Swept Mesh command with the Type list set to Manual Between to create one layer of cohesive elements between specified source and target faces. If the source and target faces are coincident, the software generates cohesive elements that have a thickness value of zero.

For information on using the 3D Swept Mesh technique, see Automatic Between and Manual Between meshes.

Defining the source and target faces

In the Object to Mesh, you can select the source and the target faces.

• The source face must be filled with either 2D elements or with the free faces of 3D elements.

• The target face can be either meshed or unmeshed.

• The source and target faces must have an identical number of loops and an identical number of edges per loop. A loop is a face boundary.

• The mesh on the target face has the same number of nodes and the same element connectivity as the mesh on the source face.

Choosing the cohesive element type

In the Element Properties group, you can select the cohesive elements type that you want to create in the cohesive layer. The specific types of cohesive elements that you can create depend on your specified solver:

Simcenter 3D Multiphysics	Simcenter Samcef environment
Linear cohesive hexahedron (Simcenter Nastran CZHEXA) bulk data entry)	Cohesive (T147)(8)
Parabolic cohesive hexahedron (Simcenter Nastran CZHEXA) bulk data entry)	Cohesive (T147)(20)

For more information, see Cohesive elements

Elements orientation

Due to the possible thicknesses of value zero in cohesive elements, choosing and showing the elements orientation is not always straightforward. Two different situations can occur:

• The source face consists of faces of 3D elements.When the source face (1) consists of faces of 3D elements, the orientation of the cohesive elements is automatically chosen by the software so that the cohesive elements tend to have a positive volume if the bases (1,2) move away from each other in a direction (4) that does not cause interpenetration of the source and the target face (2).In this case: The normal to the first face of a cohesive element (3) (that is, the face located on the source side) points to that source face. The normal to the last face of the cohesive element (that is, the face located on the target side) points to the target face so that the source face normal and the cohesive element's last faces normal are parallel.

• The source face is made of 2D elements.When the source face is made of 2D elements, by default the software orients the cohesive element such that the normal of the first face of the cohesive element points to the source face. You can change this default:Click Preview to view that normal.In the Elements Orientation group, select or clear the Reverse Elements Orientation check box to change that normal to fit your needs.

Where do I find it?

Application	Pre/Post
Prerequisite	A FEM file as the work part and displayed part
Command Finder	3D Swept Mesh

How do I

Create a 3D swept cohesive mesh between bodies.

Sweeping a cohesive mesh between bodies, Simcenter 3D 2021.1 Series

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