General flow rule

Overview

A general flow rule provides the interface

So it provides a generic stress rate and history evolution rate as a function of the current state.

The base interface is entirely abstract. It maintains a set of history variables set by the specific implementation.

Implementations

• Viscoplastic general flow rule
  • Overview
  • Parameters
  • Class description
    • TVPFlowRule
      • TVPFlowRule::TVPFlowRule()
      • TVPFlowRule::populate_hist()
      • TVPFlowRule::init_hist()
      • TVPFlowRule::s()
      • TVPFlowRule::ds_ds()
      • TVPFlowRule::ds_da()
      • TVPFlowRule::ds_de()
      • TVPFlowRule::a()
      • TVPFlowRule::da_ds()
      • TVPFlowRule::da_da()
      • TVPFlowRule::da_de()
      • TVPFlowRule::work_rate()
      • TVPFlowRule::elastic_strains()
      • TVPFlowRule::set_elastic_model()
      • TVPFlowRule::override_guess()
      • TVPFlowRule::type()
      • TVPFlowRule::initialize()
      • TVPFlowRule::parameters()
• Walker-Krempl rate sensitivity modification
  • Overview
  • Parameters
  • Class description
    • WalkerKremplSwitchRule
      • WalkerKremplSwitchRule::WalkerKremplSwitchRule()
      • WalkerKremplSwitchRule::populate_hist()
      • WalkerKremplSwitchRule::init_hist()
      • WalkerKremplSwitchRule::s()
      • WalkerKremplSwitchRule::ds_ds()
      • WalkerKremplSwitchRule::ds_da()
      • WalkerKremplSwitchRule::ds_de()
      • WalkerKremplSwitchRule::a()
      • WalkerKremplSwitchRule::da_ds()
      • WalkerKremplSwitchRule::da_da()
      • WalkerKremplSwitchRule::da_de()
      • WalkerKremplSwitchRule::work_rate()
      • WalkerKremplSwitchRule::elastic_strains()
      • WalkerKremplSwitchRule::set_elastic_model()
      • WalkerKremplSwitchRule::kappa()
      • WalkerKremplSwitchRule::dkappa()
      • WalkerKremplSwitchRule::override_guess()
      • WalkerKremplSwitchRule::type()
      • WalkerKremplSwitchRule::initialize()
      • WalkerKremplSwitchRule::parameters()

Class description

class GeneralFlowRule : public neml::HistoryNEMLObject

ABC for a completely general flow rule…

Subclassed by neml::TVPFlowRule, neml::WalkerKremplSwitchRule

Public Functions

GeneralFlowRule(ParameterSet &params)

virtual void s(const double *const s, const double *const alpha, const double *const edot, double T, double Tdot, double *const sdot) = 0

Stress rate.

virtual void ds_ds(const double *const s, const double *const alpha, const double *const edot, double T, double Tdot, double *const d_sdot) = 0

Partial of stress rate wrt stress.

virtual void ds_da(const double *const s, const double *const alpha, const double *const edot, double T, double Tdot, double *const d_sdot) = 0

Partial of stress rate wrt history.

virtual void ds_de(const double *const s, const double *const alpha, const double *const edot, double T, double Tdot, double *const d_sdot) = 0

Partial of stress rate wrt strain rate.

virtual void a(const double *const s, const double *const alpha, const double *const edot, double T, double Tdot, double *const adot) = 0

History rate.

virtual void da_ds(const double *const s, const double *const alpha, const double *const edot, double T, double Tdot, double *const d_adot) = 0

Partial of history rate wrt stress.

virtual void da_da(const double *const s, const double *const alpha, const double *const edot, double T, double Tdot, double *const d_adot) = 0

Partial of history rate wrt history.

virtual void da_de(const double *const s, const double *const alpha, const double *const edot, double T, double Tdot, double *const d_adot) = 0

Partial of history rate wrt strain rate.

virtual void work_rate(const double *const s, const double *const alpha, const double *const edot, double T, double Tdot, double &p_rate)

The implementation needs to define inelastic dissipation.

virtual void elastic_strains(const double *const s_np1, double T_np1, double *const e_np1) const = 0

The implementation needs to define elastic strain.

virtual void set_elastic_model(std::shared_ptr<LinearElasticModel> emodel)

Set a new elastic model.

virtual void override_guess(double *const x)

Optional method for modifying the initial guess.