ExponentialSoftening Class Reference

ExponentialSoftening is a smeared crack softening model that uses an exponential softening curve. More...

#include <ExponentialSoftening.h>

Inheritance diagram for ExponentialSoftening:

Public Member Functions
	ExponentialSoftening (const InputParameters &parameters)
virtual void	computeCrackingRelease (Real &stress, Real &stiffness_ratio, const Real strain, const Real crack_initiation_strain, const Real crack_max_strain, const Real cracking_stress, const Real youngs_modulus) override
	Compute the effect of the cracking release model on the stress and stiffness in the direction of a single crack. More...
void	resetQpProperties () final
	Retained as empty methods to avoid a warning from Material.C in framework. These methods are unused in all inheriting classes and should not be overwritten. More...
void	resetProperties () final

Protected Attributes
const Real &	_residual_stress
	Residual stress after full softening. More...
const Real &	_alpha
	Initial slope of the softening curve. More...
const bool	_alpha_set_by_user
	Variable to track whether _alpha was set by the user. More...
const Real &	_beta
	Multiplier on alpha to determine the initial softening slope. More...

Detailed Description

ExponentialSoftening is a smeared crack softening model that uses an exponential softening curve.

It is for use with ComputeSmearedCrackingStress.

Definition at line 26 of file ExponentialSoftening.h.

Constructor & Destructor Documentation

ExponentialSoftening()

ExponentialSoftening::ExponentialSoftening

(

const InputParameters &

parameters

)

Definition at line 44 of file ExponentialSoftening.C.

  : SmearedCrackSofteningBase(parameters),
    _residual_stress(getParam<Real>("residual_stress")),
    _alpha(getParam<Real>("alpha")),
    _alpha_set_by_user(parameters.isParamSetByUser("alpha")),
    _beta(getParam<Real>("beta"))
{
}

Member Function Documentation

computeCrackingRelease()

void ExponentialSoftening::computeCrackingRelease ( Real &  stress, Real &  stiffness_ratio, const Real  strain, const Real  crack_initiation_strain, const Real  crack_max_strain, const Real  cracking_stress, const Real  youngs_modulus  )

overridevirtual

Compute the effect of the cracking release model on the stress and stiffness in the direction of a single crack.

Parameters

stress	Stress in direction of crack
stiffness_ratio	Ratio of damaged to original stiffness in cracking direction
strain	Strain in the current crack direction
crack_initiation_strain	Strain in crack direction when crack first initiated
crack_max_strain	Maximum strain in crack direction
cracking_stress	Threshold tensile stress for crack initiation
youngs_modulus	Young's modulus

Implements SmearedCrackSofteningBase.

Definition at line 54 of file ExponentialSoftening.C.

{
  mooseAssert(crack_max_strain >= crack_initiation_strain,
              "crack_max_strain must be >= crack_initiation_strain");

  Real alpha = 0.0;
  if (_alpha_set_by_user)
    alpha = _alpha;
  else
    alpha = -youngs_modulus;

  // Compute stress that follows exponental curve
  stress = cracking_stress *
           (_residual_stress +
            (1.0 - _residual_stress) * std::exp(alpha * _beta / cracking_stress *
                                                (crack_max_strain - crack_initiation_strain)));
  // Compute ratio of current stiffness to original stiffness
  stiffness_ratio = stress * crack_initiation_strain / (crack_max_strain * cracking_stress);
}

resetProperties()

void SmearedCrackSofteningBase::resetProperties ( )

inlinefinalinherited

Definition at line 57 of file SmearedCrackSofteningBase.h.

{}

resetQpProperties()

void SmearedCrackSofteningBase::resetQpProperties ( )

inlinefinalinherited

Retained as empty methods to avoid a warning from Material.C in framework. These methods are unused in all inheriting classes and should not be overwritten.

Definition at line 56 of file SmearedCrackSofteningBase.h.

{}

Member Data Documentation

_alpha

const Real& ExponentialSoftening::_alpha

protected

Initial slope of the softening curve.

Definition at line 44 of file ExponentialSoftening.h.

Referenced by computeCrackingRelease().

_alpha_set_by_user

const bool ExponentialSoftening::_alpha_set_by_user

protected

Variable to track whether _alpha was set by the user.

Definition at line 47 of file ExponentialSoftening.h.

Referenced by computeCrackingRelease().

_beta

const Real& ExponentialSoftening::_beta

protected

Multiplier on alpha to determine the initial softening slope.

Definition at line 50 of file ExponentialSoftening.h.

Referenced by computeCrackingRelease().

_residual_stress

const Real& ExponentialSoftening::_residual_stress

protected

Residual stress after full softening.

Definition at line 41 of file ExponentialSoftening.h.

Referenced by computeCrackingRelease().

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The documentation for this class was generated from the following files:

• tensor_mechanics/include/materials/ExponentialSoftening.h
• tensor_mechanics/src/materials/ExponentialSoftening.C