Modular creep damage¶

Overview¶

This object implements the classical Hayhurst-Leckie-Rabotnov-Kachanov creep damage model [HL1977]. Specifically, it exactly replicates Eq. 2.6 in that paper, so that the implementation exactly replicates the analytic expressions in Eq. 2.5. The damage update is given by

$\dot{\omega} = \left(\frac{\sigma_{eff}}{A}\right)^\xi \left(1 - \omega\right)^{\xi-\phi}$

where $\sigma_{eff}$ is a modular effective stress, defined by a Effective stress object.

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
`estress`	`neml::EffectiveStress`	Effective stress	No

Class description¶

class ModularCreepDamage : public neml::ScalarDamageRate ¶

Modular version of Hayhurst-Leckie-Rabotnov-Kachanov damage.

Public Functions

ModularCreepDamage(ParameterSet &params)¶

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.