Struct IsotropicDamage 

pub struct IsotropicDamage {
    pub d: f64,
    pub energy_release_threshold: f64,
    pub damage_evolution_rate: f64,
}

Isotropic damage model (Lemaitre 1985).

Damage variable D ∈ [0, 1]:

• D = 0: undamaged
• D = 1: fully damaged (cannot carry load)

Effective stress: σ_eff = σ / (1 - D)

Fields

d: f64

Current damage variable D ∈ [0, 1]

energy_release_threshold: f64

Damage initiation threshold Y_0

damage_evolution_rate: f64

Exponential softening rate a

Implementations

impl IsotropicDamage

pub fn new(y0: f64, evolution_rate: f64) -> Self

Create a new isotropic damage model.

Arguments

• y0 - Energy release threshold for damage initiation
• evolution_rate - Exponential softening rate a

pub fn strain_energy_release_rate(&self, sigma: f64, young_modulus: f64) -> f64

Strain energy release rate: Y = σ² / (2 * E * (1-D)²)

pub fn update(&mut self, sigma: f64, young_modulus: f64)

Update damage state based on current stress and stiffness.

D = 1 - (Y_0/Y) * exp(-a*(Y-Y_0)/Y_0) if Y > Y_0 and D_new > D

pub fn effective_stiffness(&self, young_modulus: f64) -> f64

Effective (degraded) stiffness: E_eff = E * (1 - D)

pub fn effective_stress(&self, nominal_stress: f64) -> f64

Effective stress (nominal stress divided by integrity): σ_eff = σ / (1 - D)

Trait Implementations

impl Clone for IsotropicDamage

fn clone(&self) -> IsotropicDamage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for IsotropicDamage

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

Formats the value using the given formatter.