Struct Truss3 

pub struct Truss3 {
    pub node_i: Node3Id,
    pub node_j: Node3Id,
    pub area: f64,
    pub material: Material,
    pub density: f64,
}

A small-displacement axial 3D truss.

The bar has three translational components at each end; its rotational rows/columns remain zero. Its dof_mask is translations only, so a node connected only to Truss3 elements has no rotation unknowns and the model need not fix them.

Fields

node_i: Node3Id

node_j: Node3Id

area: f64

material: Material

density: f64

Mass per unit volume; zero means massless.

Implementations

impl Truss3

pub fn new( node_i: Node3Id, node_j: Node3Id, area: f64, material: Material, ) -> Self

pub fn with_density(self, density: f64) -> Self

pub fn form_tangent_and_resistance( &self, node_i: &Node3, node_j: &Node3, ) -> (SpatialElementMatrix, SpatialElementVector)

Element tangent and internal resistance in global DOF order [ux_i, uy_i, uz_i, rx_i, ry_i, rz_i, ux_j, ..., rz_j].

pub fn commit(&mut self, node_i: &Node3, node_j: &Node3)

pub fn local_force( &self, node_i: &Node3, node_j: &Node3, ) -> SpatialElementVector

See Truss::local_force’s doc comment — same reasoning, no separate local frame to rotate into.

pub fn form_mass(&self, node_i: &Node3, node_j: &Node3) -> SpatialElementVector

Diagonal lumped mass: half of the member mass at each node, applied to each of its three translational DOFs. Rotational inertia remains zero until a spatial beam/mass formulation supplies it explicitly.

Trait Implementations

impl Clone for Truss3

fn clone(&self) -> Truss3

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Truss3

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.