steelrelaxmat.h

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/*
 *
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 *               ##   ##  ##   ##  ##      ##      ## ### ##
 *              ##   ##  ##   ##  ####    ####    ##  #  ##
 *             ##   ##  ##   ##  ##      ##      ##     ##
 *            ##   ##  ##   ##  ##      ##      ##     ##
 *            #####    #####   ##      ######  ##     ##
 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef steelrelaxmat_h
#define steelrelaxmat_h
 
#include "sm/Materials/structuralmaterial.h"
#include "sm/Materials/structuralms.h"
#include "dictionary.h"
#include "floatarray.h"
#include "floatmatrix.h"


#define _IFT_SteelRelaxMat_Name "steelrelaxmat"
#define _IFT_SteelRelaxMat_E "e"
#define _IFT_SteelRelaxMat_reinfClass "reinfclass"
#define _IFT_SteelRelaxMat_k1 "k1"
#define _IFT_SteelRelaxMat_k2 "k2"
#define _IFT_SteelRelaxMat_rho1000 "rho1000"
#define _IFT_SteelRelaxMat_timeFactor "timefactor"
#define _IFT_SteelRelaxMat_charStrength "charstrength"
#define _IFT_SteelRelaxMat_approach "approach"
#define _IFT_SteelRelaxMat_tolerance "tolerance"
#define _IFT_SteelRelaxMat_relRelaxBound "relrelaxbound"
 
namespace oofem {
class GaussPoint;
class Domain;

class SteelRelaxMat : public StructuralMaterial
{
protected:
    double E = 0.;

    double k1 = 0.;

    double k2 = 0.;

    double rho1000 = 0.;

    double mu = 0.;

    double timeFactor = 0.;
 
    //double stiffnessFactor;

    double charStrength = 0.;

    double tolerance = 0.;

    double relRelaxBound = 0.;

    enum approachType { Bazant_EC2, EquivTime_EC2 } Approach = Bazant_EC2;
 
public:
    SteelRelaxMat(int n, Domain *d);
 
    FloatArrayF< 1 >giveRealStressVector_1d(const FloatArrayF< 1 > &reducedE, GaussPoint *gp, TimeStep *tStep) const override
    {
        FloatArray answer;
        const_cast< SteelRelaxMat * >( this )->giveRealStressVector(answer, gp, reducedE, tStep);
        return answer;
    }
 
    void giveRealStressVector(FloatArray &answer, GaussPoint *gp, const FloatArray &reducedStrain, TimeStep *tStep) const override;
 
    FloatMatrixF< 1, 1 >give1dStressStiffMtrx(MatResponseMode mode, GaussPoint *gp, TimeStep *tStep) const override;

    void giveStressDependentPartOfStrainVector(FloatArray &answer, GaussPoint *gp, const FloatArray &totalStrain,
                                               TimeStep *tStep, ValueModeType mode) const;
    void computeStressRelaxationStrainVector(FloatArray &answer, GaussPoint *gp, const FloatArray &totalStrain,
                                             TimeStep *tStep, ValueModeType mode) const;

    void evalStressRelaxationAtConstStrain(double &answer, GaussPoint *gp, double dt) const;

    void computeIncrOfPrestressLossAtVarStrain(double &answer, GaussPoint *gp, TimeStep *tStep, double stress) const;
 
    void initializeFrom(InputRecord &ir) override;
 
    bool hasMaterialModeCapability(MaterialMode mode) const override;
 
    bool hasCastingTimeSupport() const override { return true; }
 
    bool isCharacteristicMtrxSymmetric(MatResponseMode rMode) const override { return true; }
 
    const char *giveInputRecordName() const override { return _IFT_SteelRelaxMat_Name; }
    const char *giveClassName() const override { return "SteelRelaxMat"; }
 
    std::unique_ptr<MaterialStatus> CreateStatus(GaussPoint *gp) const override;
 
    int giveIPValue(FloatArray &answer, GaussPoint *gp, InternalStateType type, TimeStep *tStep) override;
};
 
//=============================================================================
 
 
class SteelRelaxMatStatus : public StructuralMaterialStatus
{
protected:

    double relaxIntVariable = 0.;
    double tempRelaxIntVariable = 0.;
 
    double prestress = 0.;
    double tempPrestress = 0.;
    // becomes activated at the end of the time step when the material becomes prestressed
    //    bool prestressedFlag = false;
 
public:
    SteelRelaxMatStatus(GaussPoint *g);
 
    void setTempRelaxIntVariable(double src) { tempRelaxIntVariable = src; }
    double giveTempRelaxIntVariable() const { return tempRelaxIntVariable; }
    double giveRelaxIntVariable() const { return relaxIntVariable; }
 
    void setTempPrestress(double src) { tempPrestress = src; }
    double giveTempPrestress() const { return tempPrestress; }
    double givePrestress() const { return prestress; }
 
    void printOutputAt(FILE *file, TimeStep *tStep) const override;
 
    void initTempStatus() override;
 
    void updateYourself(TimeStep *tStep) override;
 
    void saveContext(DataStream &stream, ContextMode mode) override;
    void restoreContext(DataStream &stream, ContextMode mode) override;
 
    const char *giveClassName() const override { return "SteelRelaxMatStatus"; }
};
} // end namespace oofem
#endif // steelrelaxmat_h