structuralinterfaceelement.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 structuralinterfaceelement_h
#define structuralinterfaceelement_h
 
#include "sm/CrossSections/structuralinterfacecrosssection.h"
#include "element.h"
#include "floatmatrix.h"
#include "function.h"
#include "matresponsemode.h"
#include "valuemodetype.h"
#include "integrationdomain.h"
#include "dofmantransftype.h"
 
namespace oofem {
class TimeStep;
class Node;
class StructuralInterfaceMaterial;
class GaussPoint;
class IntArray;
class FEInterpolation;
 

class StructuralInterfaceElement : public Element
{
protected:
    FloatArray initialDisplacements;
    bool nlGeometry = false;
 
public:
    StructuralInterfaceElement(int n, Domain * d);
 
    int computeGlobalCoordinates(FloatArray &answer, const FloatArray &lcoords) override;
 
    void giveCharacteristicMatrix(FloatMatrix &answer, CharType, TimeStep *tStep) override;
    void giveCharacteristicVector(FloatArray &answer, CharType type, ValueModeType mode, TimeStep *tStep) override;

    virtual void computeStiffnessMatrix(FloatMatrix &answer, MatResponseMode rMode, TimeStep *tStep);

    virtual void giveInternalForcesVector(FloatArray &answer, TimeStep *tStep, int useUpdatedGpRecord = 0);
    virtual void computeTraction(FloatArray &traction, IntegrationPoint *ip, const FloatArray &jump, TimeStep *tStep);
    virtual void computeSpatialJump(FloatArray &answer, GaussPoint *gp, TimeStep *tStep);
    int giveIPValue(FloatArray &answer, GaussPoint *gp, InternalStateType type, TimeStep *tStep) override;
 
    Interface *giveInterface(InterfaceType) override { return nullptr; }

 
    // Overloaded methods.
    void updateInternalState(TimeStep *tStep) override;
    void updateYourself(TimeStep *tStep) override;
    int checkConsistency() override;
 
    void giveInputRecord(DynamicInputRecord &input) override;
    const char *giveClassName() const override { return "StructuralInterfaceElement"; }
 
    StructuralInterfaceCrossSection *giveInterfaceCrossSection();
    virtual double computeAreaAround(GaussPoint *gp) = 0;
 
    Element_Geometry_Type giveGeometryType() const override { return EGT_unknown; }
 
    //virtual methods that should be overloaded by the elements
    virtual void giveEngTraction(FloatArray &answer, GaussPoint *gp, const FloatArray &jump, TimeStep *tStep);
    virtual void giveFirstPKTraction(FloatArray &answer, GaussPoint *gp, const FloatArray &jump, const FloatMatrix &F, TimeStep *tStep)
    {
        OOFEM_ERROR("not implemented for the current element");
    }
 
    virtual void giveStiffnessMatrix_Eng(FloatMatrix &answer, MatResponseMode rMode, IntegrationPoint *ip, TimeStep *tStep);
    virtual void giveStiffnessMatrix_dTdj(FloatMatrix &answer, MatResponseMode rMode, IntegrationPoint *ip, TimeStep *tStep)
    {
        OOFEM_ERROR("not implemented for the current element");
    }
 
protected:
    virtual void computeNmatrixAt(GaussPoint *gp, FloatMatrix &answer) = 0;
 
    // transformation matrix from local to global
    virtual void computeTransformationMatrixAt(GaussPoint *gp, FloatMatrix &answer) = 0;

    virtual int giveNumberOfIPForMassMtrxIntegration() { return 0; }
 
    virtual int testCrossSectionExtension(CrossSectExtension ext) { return ( ( ext == CS_StructuralInterfaceCapability ) ? 1 : 0 ); }
    int testElementExtension(ElementExtension ext) override { return 0; } 
};
} // end namespace oofem
#endif // structuralinterfaceelement_h