Larson Miller Damage

Overview

This model implements the damage model

$\dot{\omega} = \frac{1}{t_R\left(\sigma_{eff} \left(1-\omega\right) \right)}$

where $\sigma_{eff}$ is a modular effective stress, defined by a Effective stress object, and $t_R$ is a time-to-rupture Larson-Miller relation provided by a Larson Miller correlations object.

Parameters

Parameter	Object type	Description	Default
`elastic`	`neml::LinearElasticModel`	Elasticity model	No
`lmr`	`neml::LarsonMillerCorrelation`	Parameter	No
`estress`	`neml::EffectiveStress`	Effective stress	No

Class description

class LarsonMillerCreepDamage : public neml::ScalarDamageRate 

Time-fraction ASME damage using a generic Larson-Miller relation and effective stress.

Public Functions

LarsonMillerCreepDamage(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.