j2plasticmaterial.h

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/*
 *
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 *               ##   ##  ##   ##  ##      ##      ## ### ##
 *              ##   ##  ##   ##  ####    ####    ##  #  ##
 *             ##   ##  ##   ##  ##      ##      ##     ##
 *            ##   ##  ##   ##  ##      ##      ##     ##
 *            #####    #####   ##      ######  ##     ##
 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2013   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 j2plasticmaterial_h
#define j2plasticmaterial_h

#include "plasticmaterial.h"


#define _IFT_J2plasticMaterial_Name "j2mat"
#define _IFT_J2plasticMaterial_ry "ry"
#define _IFT_J2plasticMaterial_khm "khm"
#define _IFT_J2plasticMaterial_ihm "ihm"


namespace oofem {
class Domain;

class J2plasticMaterial : public PlasticMaterial
{
protected:
    int kinematicHardeningFlag, isotropicHardeningFlag;
    double kinematicModuli, isotropicModuli;
    //double E, nu; // isotropic material constants
    double k;

public:
    J2plasticMaterial(int n, Domain * d);
    virtual ~J2plasticMaterial();

    virtual IRResultType initializeFrom(InputRecord *ir);
    virtual void giveInputRecord(DynamicInputRecord &input);
    virtual const char *giveInputRecordName() const { return _IFT_J2plasticMaterial_Name; }
    virtual const char *giveClassName() const { return "J2plasticMaterial"; }

    virtual MaterialStatus *CreateStatus(GaussPoint *gp) const;

protected:

    //
    // yield(YC-like functions) and loading(LC-like functions) criteria specific section
    //

    virtual FloatArray *ComputeStressSpaceHardeningVars(GaussPoint *gp,
                                                        FloatArray *strainSpaceHardeningVariables);
    virtual double computeYieldValueAt(GaussPoint *gp, FloatArray *stressVector,
                                       FloatArray *stressSpaceHardeningVars);
    virtual void computeHardeningReducedModuli(FloatMatrix &answer, GaussPoint *gp,
                                               FloatArray *strainSpaceHardeningVariables,
                                               TimeStep *tStep);
    virtual FloatArray *ComputeStressGradient(GaussPoint *gp, FloatArray *stressVector,
                                              FloatArray *stressSpaceHardeningVars);
    virtual FloatArray *ComputeStressSpaceHardeningVarsReducedGradient(GaussPoint *gp,
                                                                       FloatArray *stressVector,
                                                                       FloatArray *stressSpaceHardeningVars);
    virtual int hasHardening();
    virtual void computeReducedGradientMatrix(FloatMatrix &answer, GaussPoint *gp,
                                              const FloatArray &stressVector,
                                              const FloatArray &stressSpaceHardeningVars);
    virtual void computeTrialStressIncrement(FloatArray &answer, GaussPoint *gp,
                                             const FloatArray &strainIncrement, TimeStep *tStep);
    virtual void compute3dElasticModuli(FloatMatrix &answer, GaussPoint *gp,
                                        TimeStep *tStep);

    // auxiliary function
    double computeJ2InvariantAt(FloatArray *answer);
    int giveSizeOfFullHardeningVarsVector();
    int giveSizeOfReducedHardeningVarsVector(GaussPoint *gp) const;
    double giveIsotropicHardeningVar(FloatArray *stressSpaceHardeningVars);
    void giveStressBackVector(FloatArray &answer, const FloatArray &stressSpaceHardeningVars);
};
} // end namespace oofem
#endif // j2plasticmaterial_h