TetrahedronElement

class compas_fea2.model.TetrahedronElement

Bases: _Element3D

A Solid element with 4 or 10 nodes.

Attributes:

nodesList[“Node”]

Return the list of nodes to which the element is connected.

is_quadraticbool

Check if the element is quadratic (C3D10) or linear (C3D4).

midside_nodesdict | None

Mapping edge tag -> midside Node (only for C3D10); otherwise None.

material_frameFrame

Frame used for anisotropic material directions.

Notes

This element can be either: - C3D4: A 4-node tetrahedral element. - C3D10: A 10-node tetrahedral element (with midside nodes).

Face labels (for the first 4 corner nodes) are: - S1: (0, 1, 2) - S2: (0, 1, 3) - S3: (1, 2, 3) - S4: (0, 2, 3)

The C3D10 element includes 6 additional midside nodes: - Edge (0,1) → Node 4 - Edge (1,2) → Node 5 - Edge (2,0) → Node 6 - Edge (0,3) → Node 7 - Edge (1,3) → Node 8 - Edge (2,3) → Node 9

Methods

set_material_orientation

Define or override the local material orientation frame.

Inherited Methods

ToString	Converts the instance to a string.
clear_frame	Clear the local frame, reverting to GLOBAL_FRAME.
copy	Make an independent copy of the data object.
direction_cosines	Return local axes expressed as global vectors (x, y, z).
from_json	Construct an object of this type from a JSON file.
from_jsonstring	Construct an object of this type from a JSON string.
from_polyhedron
is_axis_aligned	Return True if local frame coincides with GLOBAL frame within tolerance.
sha256	Compute a hash of the data for comparison during version control using the sha256 algorithm.
to_global_point	Convert a local point to the global frame.
to_global_vector	Convert a local vector to the global frame.
to_json	Convert an object to its native data representation and save it to a JSON file.
to_jsonstring	Convert an object to its native data representation and save it to a JSON string.
to_local_point	Convert a global point to the local frame.
to_local_vector	Convert a global vector to the local frame.
transform_to	Get the transformation from this object's local frame to another frame.
validate_data	Validate the data against the object's data schema.