FEM Mesh CalculiX

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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.png Seg3--fc.png
seg2 (B31) CalculiX nodes seg3 (B32) CalculiX nodes
Seg2.png Seg3--ccx.png
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--fc.png Tria6--fc.png
tria3 (S3) CalculiX nodes tria6 (S6) CalculiX nodes
Tria3--ccx.png Tria6--ccx.png
FreeCAD → CalculiX, Nodes
N1, N2, N3 N1, N2, N3, N4, N5, N6

Quadratic element

Quadratic element from FreeCAD to CalculiX -- node assignment
quad4 FreeCAD nodes quad8 FreeCAD nodes
Quad4--fc.png Quad8--fc.png
quad4 (S4) CalculiX nodes quad8 (S8) CalculiX nodes
Quad4--ccx.png Quad8--ccx.png
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--fc.png Tetra10--fc.png
tetra4 (C3D4) CalculiX nodes tetra10 (C3D10) CalculiX nodes
Tetra4--ccx.png Tetra10--ccx.png
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--fc.png Hexa20--fc.png
hexa8 (C3D8) CalculiX nodes hexa20 (C3D20) CalculiX nodes
Hexa8--ccx.png Hexa20--ccx.png
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--fc.png Penta15--fc.png
penta6 (C3D6) CalculiX nodes penta15 (C3D15) CalculiX nodes
Penta6--ccx.png Penta15--ccx.png
FreeCAD → CalculiX, Nodes
N5, N6, N4, N2, N3, N1 N5, N6, N4, N2, N3, N1, N11, N12, N10, N8, N9, N7, N14, N15, N13