Struct SccrModel 

pub struct SccrModel {
    pub k_iscc: f64,
    pub k_ic: f64,
    pub v_plateau: f64,
    pub stage1_exponent: f64,
    pub stage1_coeff: f64,
}

Stress corrosion cracking model.

Combines fracture mechanics (KI) with the electrochemical dissolution mechanism (anodic dissolution model).

Fields

k_iscc: f64

Threshold stress intensity factor KIscc [MPa·m^0.5].

k_ic: f64

Fracture toughness KIc [MPa·m^0.5].

v_plateau: f64

Stage II (plateau) crack velocity [m/s].

stage1_exponent: f64

Exponent in Stage I power-law velocity: v = A·(KI − KIscc)^n.

stage1_coeff: f64

Coefficient A in Stage I velocity [m/s · (MPa·m^0.5)^(−n)].

Implementations

impl SccrModel

pub fn new( k_iscc: f64, k_ic: f64, v_plateau: f64, stage1_exponent: f64, stage1_coeff: f64, ) -> Self

Create a new SCC model.

pub fn crack_velocity(&self, ki: f64) -> f64

Crack propagation velocity [m/s] at stress intensity ki [MPa·m^0.5].

Three-stage model:

• KI < KIscc → 0 (no crack growth)
• KIscc ≤ KI < KIc → Stage I/II (Plateau or power-law)
• KI ≥ KIc → catastrophic (returns f64::INFINITY)

pub fn time_to_fracture( &self, a0: f64, sigma: f64, geometry_factor_y: f64, steps: usize, ) -> f64

Time to fracture [s] from an initial crack of length a0 [m] to the critical length ac [m] under constant stress sigma [MPa].

Critical crack length: ac = (KIc / (Y · σ · √π))² Uses simple trapezoidal integration over crack length.

Arguments

• a0 – initial half-crack length [m]
• sigma – applied stress [MPa]
• geometry_factor_y – geometry correction factor Y (≈ 1.0 for centre crack)
• steps – integration steps

pub fn susceptibility_index(&self) -> f64

Susceptibility index (0–1): (KIscc / KIc).

Values close to 1 indicate low susceptibility (wide safe window).

Trait Implementations

impl Clone for SccrModel

fn clone(&self) -> SccrModel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SccrModel

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

Formats the value using the given formatter.