Struct Chaboche 

pub struct Chaboche {
    pub sigma_y0: f64,
    pub q: f64,
    pub b_iso: f64,
    pub c_kin: f64,
    pub gamma_kin: f64,
}

Chaboche combined isotropic-kinematic hardening model.

Isotropic part: R(p) = Q*(1 - exp(-b*p)) where p = ∫|dε_p| Kinematic part: dα = C * dε_p - γ * α * dp (Armstrong-Frederick rule)

Yield surface: f = ||σ - α||_vM - (σ_y0 + R) = 0

Fields

sigma_y0: f64

Initial yield stress (Pa).

q: f64

Isotropic saturation stress Q (Pa).

b_iso: f64

Isotropic saturation rate b.

c_kin: f64

Kinematic hardening modulus C (Pa).

gamma_kin: f64

Kinematic recovery parameter γ (dimensionless).

Implementations

impl Chaboche

pub fn new( sigma_y0: f64, q: f64, b_iso: f64, c_kin: f64, gamma_kin: f64, ) -> Self

Create a Chaboche model.

pub fn steel_default() -> Self

Default steel parameters (representative values).

pub fn isotropic_stress(&self, p: f64) -> f64

Isotropic hardening stress R(p) = Q*(1 - exp(-b*p)).

pub fn yield_stress(&self, p: f64) -> f64

Current yield stress: σ_y0 + R(p).

pub fn backstress_increment( &self, flow_dir: &[f64; 6], alpha: &[f64; 6], delta_p: f64, ) -> [f64; 6]

Armstrong-Frederick backstress increment.

Δα = C * n̂ * Δp - γ * α * Δp where n̂ is the flow direction, Δp the plastic strain increment.

pub fn backstress_norm(alpha: &[f64; 6]) -> f64

Accumulated backstress norm ||α|| = sqrt(2/3 α:α).

Trait Implementations

impl Clone for Chaboche

fn clone(&self) -> Chaboche

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Chaboche

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

Formats the value using the given formatter.