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Aerospace
Essential utility tools developed using HyperMesh-Tcl.
Connection Tools
Sewing Tools
Connect two dissimilar 2D shell meshes using RBE3 connection.

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Aerospace
Essential utility tools developed using HyperMesh-Tcl.
- Assembly Tools
  Create an assembly structure from a .csv file definition.
- Load/BCs Tools
- Connection Tools
  - Convert CFAST Elements
    Use the cfast converter tool to convert CFAST elements into CBAR/RBE3 (spiders). For thermoelastic analysis, the CFAST has no thermal expansion coefficient. CBAR is thermoelastic compatible.
  - Stuck Node Creation
    Use the Stuck Node Creation tool to create (double) RBE3 connection to "stick" nodes on QUAD or TRIA elements to make the node displacements following the element ones.
  - Create Linear Gaps
    Use the Linear Gap tool to create linear gap analysis cards for Nastran and OptiStruct.
  - Sewing Tools
    Connect two dissimilar 2D shell meshes using RBE3 connection.
  - Create 0D Elements Between Disconnected Nodes
    In the steps below, you will create zero length elements and review.
  - Create 0D Elements Between Connected Nodes
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Import an aeroelastic finite element model with Nastran Bulk Data format.
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Text Files
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Sewing Tools

Connect two dissimilar 2D shell meshes using RBE3 connection.

If the nodes are really close to each other within a tolerance, they will snap without creating the RBE3 connection.

From the menu bar, click Aerospace > Connections > Sewing Tools.
Select the global finite element model (GFEM).
The free edges that need to be connected display.
Select the detailed finite element model (DFEM).
The free edges that need to be connected display.
Click Sew.
This connects the 2D shell meshes using RBE3 connection.
Note: Height is the cordial height difference between GFEM and DFEM models. RBE3 is not created if the height is more than the height tolerance that you provide. Global finite element models are coarse FE models with shell and beam elements for internal loads calculation. Detailed finite element models are fine models, mostly with shells and solids with finer mesh for detail strength calculation.
Figure 1. Coarse (GFEM) and Fine (DFEM) Mesh

Figure 2. RBE3 Connection only on the Two Free Edges of the GFEM and DFEM Element Sets

Note: You can also create stuck node connection (double RBE3) to connect master nodes and slave nodes of two disconnected components. Select the master nodes (from a coarse mesh) and then select slave nodes from fine mesh to sew.