Struct JohnsonCookModel 

pub struct JohnsonCookModel {
    pub a: f64,
    pub b: f64,
    pub n: f64,
    pub c: f64,
    pub m: f64,
    pub eps_dot0: f64,
    pub t_room: f64,
    pub t_melt: f64,
}

Johnson-Cook constitutive model for thermoviscoplastic flow stress.

σ = (A + B·ε^n) · (1 + C·ln(ε̇/ε̇₀)) · (1 - T*^m)

where T* = (T - T_room) / (T_melt - T_room) is the homologous temperature.

Reference: Johnson & Cook (1983).

Fields

a: f64

Yield stress A [Pa].

b: f64

Strain hardening coefficient B [Pa].

n: f64

Strain hardening exponent n (dimensionless).

c: f64

Strain rate sensitivity C (dimensionless).

m: f64

Thermal softening exponent m (dimensionless).

eps_dot0: f64

Reference strain rate ε̇₀ [1/s].

t_room: f64

Room temperature T_room [K].

t_melt: f64

Melt temperature T_melt [K].

Implementations

impl JohnsonCookModel

pub fn new( a: f64, b: f64, n: f64, c: f64, m: f64, eps_dot0: f64, t_room: f64, t_melt: f64, ) -> Self

Create a new Johnson-Cook model.

pub fn aisi_4340() -> Self

Typical AISI 4340 steel parameters.

pub fn homologous_temperature(&self, temperature: f64) -> f64

Homologous temperature T* ∈ [0, 1].

pub fn flow_stress(&self, eps: f64, eps_dot: f64, temp: f64) -> f64

Flow stress σ [Pa].

Arguments

• eps - Equivalent plastic strain (dimensionless, ≥ 0)
• eps_dot - Equivalent plastic strain rate [1/s]
• temp - Current temperature [K]

pub fn isothermal_flow_stress(&self, eps: f64) -> f64

Isothermal flow stress (room temperature, reference strain rate).

pub fn strain_rate_sensitivity(&self, eps_dot: f64, eps: f64, temp: f64) -> f64

Strain-rate sensitivity ratio: σ(ε̇) / σ(ε̇₀) at given strain and temperature.

Trait Implementations

impl Clone for JohnsonCookModel

fn clone(&self) -> JohnsonCookModel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for JohnsonCookModel

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

Formats the value using the given formatter.