Struct CartilageModel 

pub struct CartilageModel {
    pub aggregate_modulus: f64,
    pub permeability: f64,
    pub poisson_solid: f64,
    pub thickness_mm: f64,
}

Mow biphasic model for articular cartilage.

Treats cartilage as a mixture of:

• Solid phase: elastic porous matrix.
• Fluid phase: interstitial water (nearly incompressible).

Models creep and stress relaxation under compressive loading.

Fields

aggregate_modulus: f64

Aggregate modulus H_A [MPa].

permeability: f64

Permeability k [m⁴/(N·s)].

poisson_solid: f64

Poisson’s ratio ν_s of solid matrix (0 to 0.5).

thickness_mm: f64

Thickness of cartilage layer h [mm].

Implementations

impl CartilageModel

pub fn new( aggregate_modulus: f64, permeability: f64, poisson_solid: f64, thickness_mm: f64, ) -> Self

Construct a CartilageModel with standard articular cartilage parameters.

pub fn characteristic_time(&self) -> f64

Characteristic diffusion time scale t* = h²/(H_A*k) [s].

Controls the rate of fluid exudation under constant load.

pub fn creep_response(&self, sigma0: f64, time: f64) -> f64

Creep deformation at time t under constant stress σ₀ [normalized].

Approximated as: u(t)/u_∞ ≈ 1 - exp(-t / t*).

pub fn stress_relaxation(&self, epsilon0: f64, time: f64) -> f64

Stress relaxation at time t under constant strain ε₀ [MPa].

Approximated as: σ(t) = σ_0 * exp(-t / t*).

pub fn lame_lambda(&self) -> f64

Compute Lamé parameter λ [MPa] for the solid matrix.

Trait Implementations

impl Clone for CartilageModel

fn clone(&self) -> CartilageModel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CartilageModel

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

Formats the value using the given formatter.