Classical creep damage¶

Overview¶

This object implements the classical Hayhurst-Leckie-Rabotnov-Kachanov creep damage model [HL1977]. The damage update is given by

$\dot{\omega} = \left(\frac{\sigma_{eff}}{A}\right)^\xi \left(1 - \omega\right)^{-\phi} \sigma_{eff} = \sqrt{\frac{3}{2} \operatorname{dev}\left(\bm{\sigma}\right):\operatorname{dev}\left(\bm{\sigma}\right)}.$

Parameters¶

Parameter	Object type	Description	Default
`elastic`	`neml::LinearElasticModel`	Elasticity model	No
`A`	`neml::Interpolate`	Parameter	No
`xi`	`neml::Interpolate`	Stress exponent	No
`phi`	`neml::Interpolate`	Damage exponent	No

Class description¶

class ClassicalCreepDamage : public neml::ScalarDamageRate ¶

Classical Hayhurst-Leckie-Rabotnov-Kachanov damage.

Public Functions

ClassicalCreepDamage(ParameterSet &params)¶: Parameters are the elastic model, the parameters A, xi, phi, the base model, the CTE, the solver tolerance, maximum iterations, and the verbosity flag.

virtual void damage_rate(double d, const double *const e, const double *const s, double T, double t, double *const dd) const¶: The damage rate.

virtual void ddamage_rate_dd(double d, const double *const e, const double *const s, double T, double t, double *const dd) const¶: Derivative of damage rate wrt damage.

virtual void ddamage_rate_de(double d, const double *const e, const double *const s, double T, double t, double *const dd) const¶: Derivative of damage rate wrt strain.

virtual void ddamage_rate_ds(double d, const double *const e, const double *const s, double T, double t, double *const dd) const¶: Derivative of damage rate wrt stress.

Public Static Functions

static std::string type()¶: String type for the object system.

static ParameterSet parameters()¶: Return the default parameters.

static std::unique_ptr<NEMLObject> initialize(ParameterSet &params)¶: Initialize from a parameter set.