Struct ModifiedCamClay 

pub struct ModifiedCamClay {
    pub m: f64,
    pub kappa: f64,
    pub lambda: f64,
    pub e0: f64,
    pub poisson_ratio: f64,
    pub pc0: f64,
}

Modified Cam-Clay (MCC) critical state soil mechanics model.

Yield surface: f = q² / M² + p’(p’ - p’_c) = 0

where: p’ = I₁/3 = mean effective stress q = √(3 J₂) = deviatoric stress (von Mises) M = critical state stress ratio q/p’ at failure p’_c = pre-consolidation pressure (hardening variable)

Fields

m: f64

Critical state stress ratio M = q/p at critical state.

kappa: f64

Swelling line slope κ in e-ln(p) space.

lambda: f64

Normal consolidation line slope λ in e-ln(p) space.

e0: f64

Initial void ratio e₀.

poisson_ratio: f64

Poisson’s ratio ν (for elastic stiffness).

pc0: f64

Initial pre-consolidation pressure p’_c0 (Pa).

Implementations

impl ModifiedCamClay

pub fn new( m: f64, kappa: f64, lambda: f64, e0: f64, poisson_ratio: f64, pc0: f64, ) -> Self

Create a Modified Cam-Clay model.

pub fn soft_clay() -> Self

Soft clay default parameters.

pub fn bulk_modulus(&self, p_prime: f64) -> f64

Elastic bulk modulus K = (1+e₀) p’ / κ.

pub fn shear_modulus(&self, p_prime: f64) -> f64

Elastic shear modulus from K and Poisson’s ratio.

pub fn mean_stress(stress: &[f64; 6]) -> f64

Mean effective stress from stress vector (Voigt: [xx,yy,zz,xy,yz,xz]).

pub fn deviatoric_stress(stress: &[f64; 6]) -> f64

Deviatoric stress q = √(3 J₂).

pub fn yield_function(&self, stress: &[f64; 6], pc: f64) -> f64

Yield function f = q²/M² + p’(p’ - p’_c).

pub fn critical_state_pressure(&self, pc: f64) -> f64

Critical state (CSL) pressure at given void ratio.

p_cs = p_c / 2 (at yield surface apex for MCC)

pub fn update_preconsolidation_pressure( &self, pc: f64, delta_eps_v_p: f64, ) -> f64

Hardening: evolution of p’_c with plastic volumetric strain Δε_v_p.

p’_c^new = p’_c * exp((1+e₀) * Δε_v_p / (λ - κ))

pub fn compression_index(&self) -> f64

Compression index Cc ≈ λ * ln(10) (conventional oedometer measure).

Trait Implementations

impl Clone for ModifiedCamClay

fn clone(&self) -> ModifiedCamClay

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ModifiedCamClay

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

Formats the value using the given formatter.

impl Copy for ModifiedCamClay