NodeSupport

class planestress.pre.boundary_condition.NodeSupport(point: tuple[float, float], direction: str, value: float = 0.0)

Bases: NodeBoundaryCondition

Class for adding a support to a node.

Variables:

mesh_tag – Tagged node object.

Methods

apply_bc	Applies the boundary condition.
get_dofs_given_direction	Gets the degrees of freedom based on the BC direction.
get_node_dofs	Get the degrees of freedom of the node.

__init__(point: tuple[float, float], direction: str, value: float = 0.0) → None

Inits the NodeSupport class.

Parameters:

• point (tuple[float, float]) – Point location (x, y) of the node support.

• direction (str) – Direction of the node support, either "x" or "y" (rollers), or "xy" (pin).

• value (float) – Imposed displacement to apply to the node support. Defaults to 0.0, i.e. a node support with fixed zero displacement.

Example

TODO.

apply_bc(k: lil_array, f: npt.NDArray[np.float64]) → tuple[lil_array, npt.NDArray[np.float64]]

Applies the boundary condition.

Parameters:

• k (lil_array) – Stiffness matrix.

• f (npt.NDArray[np.float64]) – Load vector.

Returns:

Modified stiffness matrix and load vector (k, f).

Return type:

tuple[lil_array, npt.NDArray[np.float64]]

get_dofs_given_direction(dofs: list[int]) → list[int]

Gets the degrees of freedom based on the BC direction.

Parameters:

dofs (list[int]) – Degrees of freedom.

Returns:

Degrees of freeom in BC direction.

Return type:

list[int]

get_node_dofs() → list[int]

Get the degrees of freedom of the node.

Raises:

RuntimeError – If a mesh tag has not been assigned.

Returns:

List (length 2) of degrees of freedom.

Return type:

list[int]