linearelasticmaterial.h

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/*
 *
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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 linearelasticmaterial_h
#define linearelasticmaterial_h
 
#include "sm/Materials/structuralmaterial.h"
#include "floatmatrixf.h"
#include "floatarrayf.h"


#define _IFT_LinearElasticMaterial_preCastStiffRed "precaststiffred"
 
 
namespace oofem {
class LinearElasticMaterial : public StructuralMaterial
{
protected:
    double preCastStiffnessReduction = 0.;

    FloatMatrixF<6,6> tangent;
    FloatMatrixF<4,4> tangentPlaneStrain;
    FloatMatrixF<3,3> tangentPlaneStress;

    FloatArrayF<6> alpha;
 
public:
    LinearElasticMaterial(int n, Domain *d) : StructuralMaterial(n, d) { }
 
    void initializeFrom(InputRecord &ir) override;
    void giveInputRecord(DynamicInputRecord &input) override;
 
    const FloatMatrixF<6,6> &giveTangent() const { return tangent; }
    const FloatArrayF<6> &giveAlpha() const { return alpha; }
    
    void computesSubTangents();
 
    FloatMatrixF<6,6> give3dMaterialStiffnessMatrix(MatResponseMode mode, GaussPoint *gp, TimeStep *tStep) const override;
    FloatArrayF<6> giveThermalDilatationVector(GaussPoint *gp, TimeStep *tStep) const override;
 
    FloatArrayF<6> giveRealStressVector_3d(const FloatArrayF<6> &strain, GaussPoint *gp, TimeStep *tStep) const override;
    virtual FloatArrayF<6> giveRealStressVector_3dDegeneratedShell(const FloatArrayF<6> &reducedF, GaussPoint *gp, TimeStep *tStep) const;
    FloatArrayF<3> giveRealStressVector_PlaneStress(const FloatArrayF<3> &reducedStrain, GaussPoint *gp, TimeStep *tStep) const override;
    FloatArrayF<1> giveRealStressVector_1d(const FloatArrayF<1> &reducedStrain, GaussPoint *gp, TimeStep *tStep) const  override;
    FloatArrayF<2> giveRealStressVector_Warping(const FloatArrayF<2> &reducedStrain, GaussPoint *gp, TimeStep *tStep) const override;
    FloatArrayF<2> giveRealStressVector_2dBeamLayer(const FloatArrayF<2> &reducedE, GaussPoint *gp, TimeStep *tStep) const override;
    FloatArrayF<5> giveRealStressVector_PlateLayer(const FloatArrayF<5> &reducedE, GaussPoint *gp, TimeStep *tStep) const override;
    FloatArrayF<3> giveRealStressVector_Fiber(const FloatArrayF<3> &reducedE, GaussPoint *gp, TimeStep *tStep) const override;
 
    void giveEshelbyStressVector_PlaneStrain(FloatArray &answer, GaussPoint *gp, const FloatArray &reducedF, TimeStep *tStep) override;
    double giveEnergyDensity(GaussPoint *gp, TimeStep *tStep);
    int giveIPValue(FloatArray &answer, GaussPoint *gp, InternalStateType type, TimeStep *tStep) override;
 
    std::unique_ptr<MaterialStatus> CreateStatus(GaussPoint *gp) const override;

    virtual double giveShearModulus() const { return 1.; }
    bool hasCastingTimeSupport() const override { return true; }
    const char *giveClassName() const override { return "LinearElasticMaterial"; }
};
} // end namespace oofem
#endif // linearelasticmaterial_h