ncprincipalstrain.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 "ncprincipalstrain.h"
 
#include "error.h"
#include "xfem/enrichmentitem.h"
#include "domain.h"
#include "element.h"
#include "gausspoint.h"
 
#include "sm/Materials/structuralms.h"
#include "sm/Materials/structuralmaterial.h"
 
#include "xfem/enrichmentitems/crack.h"
#include "xfem/xfemmanager.h"
#include "xfem/enrichmentfunction.h"
#include "xfem/enrichmentfronts/enrichmentfrontlinbranchfunconeel.h"
#include "xfem/enrichmentfronts/enrichmentfrontcohesivebranchfunconeel.h"
#include "xfem/propagationlaws/plhoopstresscirc.h"
#include "xfem/propagationlaws/plprincipalstrain.h"
#include "dynamicdatareader.h"
#include "dynamicinputrecord.h"
#include "geometry.h"
#include "classfactory.h"
#include "spatiallocalizer.h"
#include "crosssection.h"
 
#include <memory>
 
namespace oofem {
REGISTER_NucleationCriterion(NCPrincipalStrain)
 
NCPrincipalStrain::NCPrincipalStrain(Domain *ipDomain):
NucleationCriterion(ipDomain),
mStrainThreshold(0.0),
mInitialCrackLength(0.0),
mIncrementLength(1.0),
mPropStrainThreshold(0.0),
mCutOneEl(false),
mCrossSectionInd(1)
{
 
}
 
NCPrincipalStrain::~NCPrincipalStrain() {
 
}
 
std::vector<std::unique_ptr<EnrichmentItem>> NCPrincipalStrain::nucleateEnrichmentItems() {
 
 
    SpatialLocalizer *octree = this->mpDomain->giveSpatialLocalizer();
    XfemManager *xMan = mpDomain->giveXfemManager();
 
    std::vector<std::unique_ptr<EnrichmentItem>> eiList;
 
    // Center coordinates of newly inserted cracks
    std::vector<FloatArray> center_coord_inserted_cracks;
 
    // Loop over all elements and all bulk GP.
    for(auto &el : mpDomain->giveElements() ) {
 
        int numIR = el->giveNumberOfIntegrationRules();
 
        int csNum = el->giveCrossSection()->giveNumber();
 
        if(csNum == mCrossSectionInd) {
 
            for(int irInd = 0; irInd < numIR; irInd++) {
                IntegrationRule *ir = el->giveIntegrationRule(irInd);
 
 
                int numGP = ir->giveNumberOfIntegrationPoints();
 
                for(int gpInd = 0; gpInd < numGP; gpInd++) {
                    GaussPoint *gp = ir->getIntegrationPoint(gpInd);
 
 
                        StructuralMaterialStatus *ms = dynamic_cast<StructuralMaterialStatus*>(gp->giveMaterialStatus());
 
                        if(ms != NULL) {
 
                            const FloatArray &strain = ms->giveTempStrainVector();
 
                            FloatArray principalVals;
                            FloatMatrix principalDirs;
                            StructuralMaterial::computePrincipalValDir(principalVals, principalDirs, strain, principal_strain);
 
                            if(principalVals[0] > mStrainThreshold) {
 
                                FloatArray crackNormal;
                                crackNormal.beColumnOf(principalDirs, 1);
        //                      printf("crackNormal: "); crackNormal.printYourself();
 
                                FloatArray crackTangent = {-crackNormal(1), crackNormal(0)};
                                crackTangent.normalize();
        //                      printf("crackTangent: "); crackTangent.printYourself();
 
 
                                // Create geometry
                                FloatArray pc = {gp->giveGlobalCoordinates()(0), gp->giveGlobalCoordinates()(1)};
        //                      printf("Global coord: "); pc.printYourself();
 
 
                                FloatArray ps = pc;
                                ps.add(-0.5*mInitialCrackLength, crackTangent);
 
                                FloatArray pe = pc;
                                pe.add(0.5*mInitialCrackLength, crackTangent);
 
                                if(mCutOneEl) {
                                    // If desired, ensure that the crack cuts exactly one element.
                                    Line line(ps, pe);
                                    std::vector<FloatArray> intersecPoints;
        //                          line.computeIntersectionPoints(el.get(), intersecPoints);
 
 
                                    if(intersecPoints.size() == 2) {
                                        ps = std::move(intersecPoints[0]);
                                        pe = std::move(intersecPoints[1]);
                                    }
                                    else {
                                        OOFEM_ERROR("intersecPoints.size() != 2")
                                    }
                                }
 
                                FloatArray points = {ps(0), ps(1), pc(0), pc(1), pe(0), pe(1)};
 
 
                                // Check if nucleation is allowed, by checking for already existing cracks close to the GP.
                                // Idea: Nucleation is not allowed if we are within an enriched element. In this way, branching is not
                                // completely prohibited, but we avoid initiating multiple similar cracks.
                                bool insertionAllowed = true;
 
                                Element *el_s = octree->giveElementContainingPoint(ps);
                                if(el_s) {
                                    if( xMan->isElementEnriched(el_s) ) {
                                        insertionAllowed = false;
                                    }
                                }
 
                                Element *el_c = octree->giveElementContainingPoint(pc);
                                if(el_c) {
                                    if( xMan->isElementEnriched(el_c) ) {
                                        insertionAllowed = false;
                                    }
                                }
 
                                Element *el_e = octree->giveElementContainingPoint(pe);
                                if(el_e) {
                                    if( xMan->isElementEnriched(el_e) ) {
                                        insertionAllowed = false;
                                    }
                                }
 
                                for(const auto &x: center_coord_inserted_cracks) {
                                    if( distance(x, pc) <  2.0*mInitialCrackLength) {
                                        insertionAllowed = false;
                                        printf("Preventing insertion.\n");
                                        break;
                                    }
                                }
 
                                if(insertionAllowed) {
                                    int n = xMan->giveNumberOfEnrichmentItems() + 1;
                                    std::unique_ptr<Crack> crack = std::make_unique<Crack>(n, xMan, mpDomain);
 
 
                                    // Geometry
                                    std::unique_ptr<BasicGeometry> geom = std::make_unique<PolygonLine>();
                                    geom->insertVertexBack(ps);
                                    geom->insertVertexBack(pc);
                                    geom->insertVertexBack(pe);
                                    crack->setGeometry(std::move(geom));
 
                                    // Enrichment function
                                    crack->setEnrichmentFunction(std::make_unique<HeavisideFunction>(1, mpDomain));
 
                                    // Enrichment fronts
                                    crack->setEnrichmentFrontStart(std::make_unique<EnrFrontCohesiveBranchFuncOneEl>());
 
                                    crack->setEnrichmentFrontEnd(std::make_unique<EnrFrontCohesiveBranchFuncOneEl>());

                                    // Propagation law
 
                                    // Options
                                    auto pl = std::make_unique<PLPrincipalStrain>();
                                    pl->setRadius(0.1*mIncrementLength);
                                    pl->setIncrementLength(mIncrementLength);
                                    pl->setStrainThreshold(mPropStrainThreshold);
 
                                    crack->setPropagationLaw(std::move(pl));
 
                                    crack->updateDofIdPool();
 
                                    center_coord_inserted_cracks.push_back(pc);
                                    eiList.push_back( std::unique_ptr<EnrichmentItem>(std::move(crack)) );
 
                                    printf("NCPrincipalStrain: Nucleating a crack. principalVals[0]: %e\n", principalVals[0] );
 
                                    // We only introduce one crack per element in a single time step.
                                    break;
                                }
                            }
                        }
 
                }
            }
        } // If correct csNum
    }
 
 
    return eiList;
}
 
 
void NCPrincipalStrain::initializeFrom(InputRecord &ir)
{
    NucleationCriterion::initializeFrom(ir);
 
    IR_GIVE_FIELD(ir, mStrainThreshold, _IFT_NCPrincipalStrain_StrainThreshold);
    printf("mStrainThreshold: %e\n", mStrainThreshold);
 
    IR_GIVE_FIELD(ir, mInitialCrackLength, _IFT_NCPrincipalStrain_InitialCrackLength);
    printf("mInitialCrackLength: %e\n", mInitialCrackLength);
 
    IR_GIVE_FIELD(ir, mIncrementLength, _IFT_NCPrincipalStrain_IncrementLength);
    printf("mIncrementLength: %e\n", mIncrementLength);
 
    IR_GIVE_FIELD(ir, mPropStrainThreshold, _IFT_NCPrincipalStrain_PropStrainThreshold);
    printf("mPropStrainThreshold: %e\n", mPropStrainThreshold);
}
 
void NCPrincipalStrain :: appendInputRecords(DynamicDataReader &oDR)
{
    auto ir = std::make_unique<DynamicInputRecord>();
 
    ir->setRecordKeywordField( this->giveInputRecordName(), 1 );
 
    ir->setField(mStrainThreshold, _IFT_NCPrincipalStrain_StrainThreshold);
    ir->setField(mInitialCrackLength, _IFT_NCPrincipalStrain_InitialCrackLength);
    ir->setField(mIncrementLength, _IFT_NCPrincipalStrain_IncrementLength);
    ir->setField(mPropStrainThreshold, _IFT_NCPrincipalStrain_PropStrainThreshold);
 
    oDR.insertInputRecord(DataReader :: IR_crackNucleationRec, std::move(ir));
 
    // Enrichment function
    auto efRec = std::make_unique<DynamicInputRecord>();
    mpEnrichmentFunc->giveInputRecord(* efRec);
    oDR.insertInputRecord(DataReader :: IR_enrichFuncRec, std::move(efRec));
}
 
} /* namespace oofem */