FreeCAD: Your own 3D parametric modeler

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FEM element types in CalculiX

For detailed information on FreeCAD FEM elements see FEM Mesh and FEM Element Types. For CalculiX specific questions you may try the Discourse group or the Discord channel.

Segment element

**Segment element from FreeCAD to CalculiX -- node assignment**
seg2 FreeCAD nodes	seg3 FreeCAD nodes

seg2 (B31) CalculiX nodes	seg3 (B32) CalculiX nodes

FreeCAD → CalculiX, Nodes
N1, N2	N1, N3, N2

Triangle element

**Triangle element from FreeCAD to CalculiX -- node assignment**
tria3 FreeCAD nodes	tria6 FreeCAD nodes

tria3 (S3) CalculiX nodes	tria6 (S6) CalculiX nodes

FreeCAD → CalculiX, Nodes
N1, N2, N3	N1, N2, N3, N4, N5, N6

Quadrangle element

**Quadrangle element from FreeCAD to CalculiX -- node assignment**
quad4 FreeCAD nodes	quad8 FreeCAD nodes

quad4 (S4) CalculiX nodes	quad8 (S8) CalculiX nodes

FreeCAD → CalculiX, Nodes
N1, N2, N3, N4	N1, N2, N3, N4, N5, N6, N7, N8

Tetrahedron element

The following node order is not implemented ! TODO: verify node order (do not forget getccxVolumesByFace()).

**Tetrahedron element from FreeCAD to CalculiX -- node assignment**
tetra4 FreeCAD nodes	tetra10 FreeCAD nodes

tetra4 (C3D4) CalculiX nodes	tetra10 (C3D10) CalculiX nodes

FreeCAD → CalculiX, Nodes
N2, N3, N4, N1	N2, N3, N4, N1, N6, N10, N9, N5, N7, N8

Hexahedron element

**Hexahedron element from FreeCAD to CalculiX -- node assignment**
hexa8 FreeCAD nodes	hexa20 FreeCAD nodes

hexa8 (C3D8) CalculiX nodes	hexa20 (C3D20) CalculiX nodes

FreeCAD → CalculiX, Nodes
N6, N7, N8, N5, N2, N3, N4, N1	N6, N7, N8, N5, N2, N3, N4, N1, N14, N15, N16, N13, N10, N11, N12, N9, N18, N19, N20, N17

Pentahedron element

**Pentahedron element from FreeCAD to CalculiX -- node assignment**
penta6 FreeCAD nodes	penta15 FreeCAD nodes

penta6 (C3D6) CalculiX nodes	penta15 (C3D15) CalculiX nodes

FreeCAD → CalculiX, Nodes
N5, N6, N4, N2, N3, N1	N5, N6, N4, N2, N3, N1, N11, N12, N10, N8, N9, N7, N14, N15, N13

Related

FEM CalculiX page
CalculiX preferences dialog menu in the FEM Workbench preferences menu

This page is retrieved from https://wiki.freecad.org/FEM_Mesh_CalculiX