intmatcoulombcontact.C

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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
 */
 
#include "intmatcoulombcontact.h"
#include "gausspoint.h"
#include "floatmatrix.h"
#include "floatarray.h"
#include "mathfem.h"
#include "contextioerr.h"
#include "classfactory.h"
#include "dynamicinputrecord.h"
 
namespace oofem {
REGISTER_Material(IntMatCoulombContact);
 
IntMatCoulombContact :: IntMatCoulombContact(int n, Domain *d) : StructuralInterfaceMaterial(n, d) { }
 
 
FloatArrayF<3>
IntMatCoulombContact :: giveEngTraction_3d(const FloatArrayF<3> &jump, GaussPoint *gp, TimeStep *tStep) const
{
    IntMatCoulombContactStatus *status = static_cast< IntMatCoulombContactStatus * >( this->giveStatus( gp ) );
    auto tempShearStressShift = status->giveShearStressShift();
 
    double normalJump = jump[0];
    FloatArrayF<2> shearJump{ jump[1], jump[2] };
 
    double maxShearStress = 0.0;
    double shift = -this->kn * this->stiffCoeff * normalClearance;
 
    double normalStress;
    if ( normalJump + normalClearance <= 0. ) {
        normalStress = this->kn * ( normalJump + normalClearance ) + shift; //in compression and after the clearance gap closed
        maxShearStress = fabs( normalStress ) * this->frictCoeff;
    } else {
        normalStress = this->kn * this->stiffCoeff * ( normalJump + normalClearance ) + shift;
        maxShearStress = 0.;
    }
    auto shearStress = this->kn * shearJump - tempShearStressShift;
    double dp = norm(shearStress);
    double eps = 1.0e-15; // small number
    if ( dp > maxShearStress ) {
        shearStress *= maxShearStress / ( dp + eps );
    }
    tempShearStressShift = this->kn * shearJump - shearStress;
 
    // Set stress components in the traction vector
    FloatArrayF<3> answer = {normalStress, shearStress[0], shearStress[1]};
 
    // Update gp
    status->setTempShearStressShift( tempShearStressShift );
    status->letTempJumpBe( jump );
    status->letTempTractionBe( answer );
    return answer;
}
 
 
FloatMatrixF<3,3>
IntMatCoulombContact :: give3dStiffnessMatrix_Eng(MatResponseMode rMode, GaussPoint *gp, TimeStep *tStep) const
{
    IntMatCoulombContactStatus *status = static_cast< IntMatCoulombContactStatus * > ( this->giveStatus(gp) );
    const auto &jump = status->giveTempJump();
    double normalJump = jump[0]; //in status, normal is always the first component
 
    auto answer = eye<3>();
    if ( rMode == SecantStiffness || rMode == TangentStiffness ) {
        if ( normalJump + normalClearance <= 0 ) {
            answer *= this->kn; //in compression and after the clearance gap closed
        } else {
            answer *= this->kn * this->stiffCoeff;
        }
    } else {
        answer *= this->kn;
    }
    return answer;
}
 
 
void
IntMatCoulombContact :: initializeFrom(InputRecord &ir)
{
    StructuralInterfaceMaterial :: initializeFrom( ir );
 
    frictCoeff = 0.;
    stiffCoeff = 0.;
    normalClearance = 0.;
    IR_GIVE_FIELD(ir, kn, _IFT_IntMatCoulombContact_kn);
    IR_GIVE_OPTIONAL_FIELD(ir, frictCoeff, _IFT_IntMatCoulombContact_frictCoeff);
    IR_GIVE_OPTIONAL_FIELD(ir, stiffCoeff, _IFT_IntMatCoulombContact_stiffCoeff);
    IR_GIVE_OPTIONAL_FIELD(ir, normalClearance, _IFT_IntMatCoulombContact_normalClearance);
}
 
 
void
IntMatCoulombContact :: giveInputRecord(DynamicInputRecord &input)
{
    StructuralInterfaceMaterial :: giveInputRecord(input);
    input.setField(this->kn, _IFT_IntMatCoulombContact_kn);
    input.setField(this->frictCoeff, _IFT_IntMatCoulombContact_frictCoeff);
    input.setField(this->stiffCoeff, _IFT_IntMatCoulombContact_stiffCoeff);
    input.setField(this->normalClearance, _IFT_IntMatCoulombContact_normalClearance);
}
 
 
IntMatCoulombContactStatus :: IntMatCoulombContactStatus(GaussPoint *g) : StructuralInterfaceMaterialStatus(g)
{}
 
 
void
IntMatCoulombContactStatus :: printOutputAt(FILE *file, TimeStep *tStep) const
{
    StructuralInterfaceMaterialStatus::printOutputAt( file, tStep );
    fprintf(file, "status { ");
    fprintf( file, "shearStressShift (%f, %f)", this->shearStressShift.at( 1 ), this->shearStressShift.at( 2 ) );
    fprintf(file, "}\n");
}
 
 
void
IntMatCoulombContactStatus :: initTempStatus()
{
    StructuralInterfaceMaterialStatus::initTempStatus( );
    tempShearStressShift = shearStressShift;
}
 
 
void
IntMatCoulombContactStatus :: updateYourself(TimeStep *tStep)
{
    StructuralInterfaceMaterialStatus::updateYourself( tStep );
    shearStressShift = tempShearStressShift;
}
 
 
void
IntMatCoulombContactStatus :: saveContext(DataStream &stream, ContextMode mode)
{
    StructuralInterfaceMaterialStatus::saveContext( stream, mode );
 
    //if ( !stream.write(kappa) ) {
    //THROW_CIOERR(CIO_IOERR);
    //}
}
 
 
void
IntMatCoulombContactStatus :: restoreContext(DataStream &stream, ContextMode mode)
{
    StructuralInterfaceMaterialStatus::restoreContext( stream, mode );
 
    //if ( !stream.read(kappa) ) {
    //THROW_CIOERR(CIO_IOERR);
    //}
}
} // end namespace oofem