Struct RubberElasticity 

pub struct RubberElasticity {
    pub n_chains: f64,
    pub kt: f64,
    pub crosslink_density: f64,
}

Neo-Hookean rubber elasticity model.

Models a crosslinked elastomer network in terms of chain density, thermal energy, and crosslink density.

Fields

n_chains: f64

Number of network chains per unit volume (m⁻³).

kt: f64

Thermal energy k_B T (J).

crosslink_density: f64

Crosslink density ν (m⁻³); used in bulk modulus estimate.

Implementations

impl RubberElasticity

pub fn new(n_chains: f64, kt: f64, crosslink_density: f64) -> Self

Create a new rubber elasticity model.

pub fn shear_modulus(&self) -> f64

Shear modulus G = n·kT (Pa).

pub fn bulk_modulus(&self) -> f64

Bulk modulus K ≈ (2/3)·G + ν·kT (compressibility contribution).

pub fn strain_energy(&self, lambda: f64) -> f64

Strain energy density W = (G/2)·(λ₁² + λ₂² + λ₃² − 3) for uniaxial stretch λ (incompressible: λ₂ = λ₃ = 1/√λ).

Arguments

• lambda – uniaxial stretch ratio (≥ 1 for extension).

pub fn stress_stretch(lambda: f64) -> f64

Nominal (1st Piola-Kirchhoff) stress for uniaxial stretch λ.

σ = G·(λ − 1/λ²).

Trait Implementations

impl Clone for RubberElasticity

fn clone(&self) -> RubberElasticity

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RubberElasticity

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

Formats the value using the given formatter.