FCMesher

A toolset for orphan mesh creation and manipulation in FreeCAD, with the secondary goal of creating include file generation procedures for mystran/nastran.

Assistance in making gui elements would be very greatly appreciated.

Macros should be listed in order of descending usefulness in this authors opinion.

Macros

export_mesh_as_bdf.py

• Exports selcted FemMeshObject(s) and/or FemMeshObjectPython(s) to a nastran bulk data file. The only way to actually export multiple parts in a single analysis, to this authors knowledge.

export_nodeset.py

• Exports selected nodesets and uses the nodeset labels to create appropriate include files for single point constraints and forces.
• The two formats for labels current supported are
  • SPC: "NAME: SPC1_SID_C"
  • Force: "NAME: FORCE_SID_Scale_Vx_Vy_Vz"

flip_shell_mesh_normals.py

• flips the normals of a shell mesh entity by reversing the node order

proto_mesh_equivalencer.py

• Collapses two FemMeshObjects together into a single one by replacing nodes within a small tolerance with the nearest one in the other body, and globally renumbering the nodes and elements.
• Goal is to replace this with something that can maintain the original meshes and only renumber the nodes to be common, such that a secondary pass of removing duplicate GRID lines in the bdf will be able to effectively crush the two together. Work on that is stalled until I can figure out who in their right mind would EVER think that wanton disregard for IDs, and arbitrary renumbering of nodes and elements was a good idea; and then how I can stop their terrible ideas from destroying my meshes.

proto_shell_mesh_with_FC_gui.py

• makes a ruled shell mesh as a ruled mesh between two curves

solid_mesh_thicken.py

• thickens a shell mesh along element normal vectors

E2T Specification

Element	Element Type ID
CBAR	1
CBUSH	2
CELAS1	3
CELAS2	4
CELAS3	5
CELAS4	6
CHEXA	7
CMASS1	8
CMASS2	9
CMASS3	10
CMASS4	11
CONM2	12
CONROD	13
CPENTA	14
CQUAD4	15
CQUAD4K	16
CROD	17
CSHEAR	18
CTETRA	19
CTRIA3	20
CTRIA3K	21

P2T Specification

Property	Property Type ID
[default]	0
PELAS	1
PBUSH	2
PBAR	3
PBARL	4
PROD	5
PSHEAR	6
PCOMP	7
PCOMP1	8
PSOLID	9

* By default:
    - 1D elements will have a PBUSH property
    - 2D elements will have a PSHELL property
    - 3D elements will have a PSOLID property

M2T Specification

* By default:
    - 1D elements will have no material property
    - 2D elements will have a MAT1 property
    - 3D elements will have a MAT1 property

Material	Material Type ID
[default]	0
MAT1	1
MAT2	2
MAT8	3
MAT9	4
PMASS	5