Struct ModifiedCamClay 

pub struct ModifiedCamClay {
    pub m_slope: f64,
    pub lambda: f64,
    pub kappa: f64,
    pub pc0: f64,
    pub pc: f64,
    pub v0: f64,
    pub poisson: f64,
}

Modified Cam-Clay critical-state model.

The yield surface in (p’, q) space is:

q^2 / M^2 + p’ (p’ - p_c) = 0

where M is the critical-state stress ratio and p_c is the pre-consolidation pressure (hardening variable).

Fields

m_slope: f64

Slope of critical state line M.

lambda: f64

Slope of normal compression line lambda.

kappa: f64

Slope of swelling/recompression line kappa.

pc0: f64

Initial pre-consolidation pressure p_c0 [Pa].

pc: f64

Current pre-consolidation pressure p_c [Pa].

v0: f64

Initial specific volume v0.

poisson: f64

Poisson’s ratio for elastic unloading.

Implementations

impl ModifiedCamClay

pub fn new( m_slope: f64, lambda: f64, kappa: f64, pc0: f64, v0: f64, poisson: f64, ) -> Self

Create a new Modified Cam-Clay model.

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

Evaluate the yield function f(p’, q).

Returns < 0 inside the yield surface (elastic), 0 on the surface,

0 outside (inadmissible before return mapping).

pub fn is_yielding(&self, p: f64, q: f64) -> bool

Check whether the stress state is on or outside the yield surface.

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

Elastic bulk modulus K from current mean stress.

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

Elastic shear modulus G (derived from K and nu).

pub fn harden(&mut self, d_eps_v_p: f64)

Harden: update pre-consolidation pressure from plastic volumetric strain increment d_eps_v_p (positive = compression).

pub fn stress_ratio(p: f64, q: f64) -> f64

Stress ratio eta = q / p’.

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

Over-consolidation ratio OCR = p_c / p’.

pub fn ncl_volumetric_strain(&self, p0: f64, p: f64) -> f64

Volumetric strain on the normal compression line from p’_0 to p’.

pub fn elastic_volumetric_strain(&self, p0: f64, p: f64) -> f64

Elastic (swelling-line) volumetric strain from p0 to p.

pub fn yield_surface_size(&self) -> f64

Size of the yield ellipse along the p-axis (= pc).

pub fn critical_state_p(&self, q: f64) -> f64

Critical-state mean stress for given q.

pub fn reset(&mut self)

Reset to initial pre-consolidation.

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.