2012-09-11 15:42:55 +00:00
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// The FOAM Project // File: elasticPlastic.C
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/*
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-------------------------------------------------------------------------------
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========= | Class Implementation
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\\ / |
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\\ / | Name: elasticPlastic
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\\ / | Family: rheologyLaw
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\\/ |
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F ield | FOAM version: 2.3
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O peration |
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A and | Copyright (C) 1991-2004 Nabla Ltd.
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M anipulation | All Rights Reserved.
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-------------------------------------------------------------------------------
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DESCRIPTION
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AUTHOR
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Hrvoje Jasak.
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-------------------------------------------------------------------------------
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*/
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#include "nonLinearElasticPlastic.H"
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#include "addToRunTimeSelectionTable.H"
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#include "zeroGradientFvPatchFields.H"
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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namespace Foam
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{
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defineTypeNameAndDebug(nonLinearElasticPlastic, 0);
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addToRunTimeSelectionTable(rheologyLaw, nonLinearElasticPlastic, dictionary);
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}
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// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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// Construct from dictionary
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Foam::nonLinearElasticPlastic::nonLinearElasticPlastic
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(
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const word& name,
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const volSymmTensorField& sigma,
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const dictionary& dict
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)
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:
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rheologyLaw(name, sigma, dict),
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rho_(dict.lookup("rho")),
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E_(dict.lookup("E")),
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nu_(dict.lookup("nu")),
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sigmaY_(dict.lookup("sigmaY")),
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Ep_(dict.lookup("Ep")),
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matStrength_(dict.lookup("sigmaMax")),
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bCf_(dict.lookup("bCf")),
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nCf_(dict.lookup("nCf"))
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{}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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Foam::nonLinearElasticPlastic::~nonLinearElasticPlastic()
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{}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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Foam::tmp<Foam::volScalarField> Foam::nonLinearElasticPlastic::rho() const
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{
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return tmp<volScalarField>
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(
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new volScalarField
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(
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IOobject
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(
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"rho",
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mesh().time().timeName(),
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mesh(),
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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mesh(),
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rho_,
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zeroGradientFvPatchScalarField::typeName
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)
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);
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}
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Foam::tmp<Foam::volScalarField> Foam::nonLinearElasticPlastic::E() const
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{
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return tmp<volScalarField>
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(
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new volScalarField
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(
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IOobject
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(
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"E",
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mesh().time().timeName(),
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mesh(),
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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mesh(),
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E_,
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zeroGradientFvPatchScalarField::typeName
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)
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);
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}
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Foam::tmp<Foam::volScalarField> Foam::nonLinearElasticPlastic::
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E(const volScalarField& epsEq) const
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{
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tmp<volScalarField> tresult
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(
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new volScalarField
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(
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IOobject
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(
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"E",
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mesh().time().timeName(),
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mesh(),
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IOobject::NO_READ,
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IOobject::AUTO_WRITE
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),
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mesh(),
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dimensionedScalar("zeroE", dimPressure, E_.value()),
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zeroGradientFvPatchScalarField::typeName
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)
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);
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2013-07-18 01:02:34 +00:00
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2012-09-11 15:42:55 +00:00
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scalar epsY = exp ( log ( log(matStrength_/(matStrength_ -
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sigmaY_)).value() /bCf_.value() ) /nCf_.value() );
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const scalarField& epsEqI = epsEq.internalField();
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forAll(epsEqI, cellI)
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{
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dimensionedScalar E = matStrength_*bCf_*nCf_ *pow(epsEqI[cellI], nCf_
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- 1.0) *exp(-bCf_*pow(epsEqI[cellI], nCf_));
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2013-07-18 01:02:34 +00:00
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// Correction of initial modulus to avoid infinity/GREAT
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2012-09-11 15:42:55 +00:00
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// for small strains and for unloading
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// strain of 0.1% might be wrong for some materials
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if(epsEqI[cellI] < 0.001)
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{
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E = matStrength_*bCf_*nCf_*pow(0.001, nCf_ - 1.0)
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*exp(-bCf_*pow(0.001, nCf_));
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}
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if(epsEqI[cellI] > epsY)
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2013-07-18 01:02:34 +00:00
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{
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2012-09-11 15:42:55 +00:00
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E = matStrength_*bCf_*nCf_*pow(epsY, nCf_ - 1.0)
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*exp(-bCf_*pow(epsY, nCf_));
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}
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tresult().internalField()[cellI] = E.value();
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}
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tresult().correctBoundaryConditions();
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return tresult;
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}
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Foam::tmp<Foam::volScalarField> Foam::nonLinearElasticPlastic::nu() const
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{
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return tmp<volScalarField>
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(
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new volScalarField
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(
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IOobject
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(
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"nu",
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mesh().time().timeName(),
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mesh(),
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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mesh(),
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nu_,
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zeroGradientFvPatchScalarField::typeName
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)
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);
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}
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Foam::tmp<Foam::volScalarField> Foam::nonLinearElasticPlastic::sigmaY() const
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{
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return tmp<volScalarField>
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(
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new volScalarField
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(
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IOobject
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(
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"sigmaY",
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mesh().time().timeName(),
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mesh(),
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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mesh(),
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sigmaY_,
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zeroGradientFvPatchScalarField::typeName
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)
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);
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}
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Foam::tmp<Foam::volScalarField> Foam::nonLinearElasticPlastic::Ep() const
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{
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return tmp<volScalarField>
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(
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new volScalarField
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(
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IOobject
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(
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"Ep",
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mesh().time().timeName(),
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mesh(),
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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mesh(),
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Ep_,
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zeroGradientFvPatchScalarField::typeName
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)
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);
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}
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Foam::tmp<Foam::volScalarField> Foam::nonLinearElasticPlastic::
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Ep(const volScalarField& sigmaEq) const
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{
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tmp<volScalarField> tresult
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(
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new volScalarField
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(
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IOobject
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(
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"Ep",
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mesh().time().timeName(),
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mesh(),
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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mesh(),
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dimensionedScalar("zeroEp", dimPressure, Ep_.value()),
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zeroGradientFvPatchScalarField::typeName
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)
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);
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scalar epsY = exp ( log ( log(matStrength_/(matStrength_ -
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sigmaY_)).value() /bCf_.value() ) /nCf_.value() );
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dimensionedScalar E = matStrength_*bCf_*nCf_ *pow(epsY, nCf_ - 1.0)
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*exp(-bCf_*pow(epsY, nCf_));
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const scalarField& sigmaEqI = sigmaEq.internalField();
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forAll(sigmaEqI, cellI)
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{
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scalar epsCurrI = exp ( log ( log(matStrength_.value()/(max(matStrength_.value()/1e6,matStrength_.value() - sigmaEqI[cellI]))) /bCf_.value()) /nCf_.value());
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dimensionedScalar Ep = matStrength_*bCf_*nCf_ *pow(epsCurrI, nCf_ - 1.0)
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*exp(-bCf_*pow(epsCurrI, nCf_));
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2013-07-18 01:02:34 +00:00
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tresult().internalField()[cellI] =
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2012-09-11 15:42:55 +00:00
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Ep.value()/(1.0 - Ep.value()/E.value());
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}
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tresult().correctBoundaryConditions();
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return tresult;
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}
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// ************************************************************************* //
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