Linear Contact Bond Model Implementation
See this file for the documentation of this contact model.
contactmodellinearcbond.h
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 | #pragma once
// contactmodellinearcbond.h
#include "contactmodel/src/contactmodelmechanical.h"
#ifdef LINEARCBOND_LIB
# define LINEARCBOND_EXPORT EXPORT_TAG
#elif defined(NO_MODEL_IMPORT)
# define LINEARCBOND_EXPORT
#else
# define LINEARCBOND_EXPORT IMPORT_TAG
#endif
namespace cmodelsxd {
using namespace itasca;
class ContactModelLinearCBond : public ContactModelMechanical {
public:
LINEARCBOND_EXPORT ContactModelLinearCBond();
LINEARCBOND_EXPORT virtual ~ContactModelLinearCBond();
virtual void copy(const ContactModel *c);
virtual void archive(ArchiveStream &);
virtual QString getName() const { return "linearcbond"; }
virtual void setIndex(int i) { index_=i;}
virtual int getIndex() const {return index_;}
enum PropertyKeys {
kwKn=1
, kwKs
, kwFric
, kwLinF
, kwLinS
, kwLinMode
, kwRGap
, kwEmod
, kwKRatio
, kwDpNRatio
, kwDpSRatio
, kwDpMode
, kwDpF
, kwCbState
, kwCbTenF
, kwCbShearF
, kwCbTStr
, kwCbSStr
};
virtual QString getProperties() const {
return "kn"
",ks"
",fric"
",lin_force"
",lin_slip"
",lin_mode"
",rgap"
",emod"
",kratio"
",dp_nratio"
",dp_sratio"
",dp_mode"
",dp_force"
",cb_state"
",cb_tenf"
",cb_shearf"
",cb_tens"
",cb_shears";
}
enum EnergyKeys { kwEStrain=1,kwESlip,kwEDashpot};
virtual QString getEnergies() const { return "energy-strain,energy-slip,energy-dashpot";}
virtual double getEnergy(uint i) const; // Base 1
virtual bool getEnergyAccumulate(uint i) const; // Base 1
virtual void setEnergy(uint i,const double &d); // Base 1
virtual void activateEnergy() { if (energies_) return; energies_ = NEWC(Energies());}
virtual bool getEnergyActivated() const {return (energies_ !=0);}
enum FishCallEvents {fActivated=0,fBondBreak, fSlipChange };
virtual QString getFishCallEvents() const { return "contact_activated,bond_break,slip_change"; }
virtual QVariant getProperty(uint i,const IContact *) const;
virtual bool getPropertyGlobal(uint i) const;
virtual bool setProperty(uint i,const QVariant &v,IContact *);
virtual bool getPropertyReadOnly(uint i) const;
virtual bool supportsInheritance(uint i) const;
virtual bool getInheritance(uint i) const { assert(i<32); quint32 mask = to<quint32>(1 << i); return (inheritanceField_ & mask) ? true : false; }
virtual void setInheritance(uint i,bool b) { assert(i<32); quint32 mask = to<quint32>(1 << i); if (b) inheritanceField_ |= mask; else inheritanceField_ &= ~mask; }
enum MethodKeys {
kwDeformability=1
, kwCbBond
, kwCbStrength
, kwCbUnbond
};
virtual QString getMethods() const {
return "deformability"
",bond"
",cb_strength"
",unbond";
}
virtual QString getMethodArguments(uint i) const;
virtual bool setMethod(uint i,const QVector<QVariant> &vl,IContact *con=0); // Base 1 - returns true if timestep contributions need to be updated
virtual uint getMinorVersion() const;
virtual bool validate(ContactModelMechanicalState *state,const double ×tep);
virtual bool endPropertyUpdated(const QString &name,const IContactMechanical *c);
virtual bool forceDisplacementLaw(ContactModelMechanicalState *state,const double ×tep);
virtual DVect2 getEffectiveTranslationalStiffness() const { DVect2 ret = effectiveTranslationalStiffness_; return ret;}
virtual DAVect getEffectiveRotationalStiffness() const { return DAVect(0.0);}
virtual ContactModelLinearCBond *clone() const { return NEWC(ContactModelLinearCBond()); }
virtual double getActivityDistance() const {return rgap_;}
virtual bool isOKToDelete() const { return !isBonded(); }
virtual void resetForcesAndMoments() { lin_F(DVect(0.0)); dp_F(DVect(0.0)); if (energies_) energies_->estrain_ = 0.0; }
virtual bool checkActivity(const double &gap) { return (gap <= rgap_ || isBonded()); }
virtual bool isSliding() const { return lin_S_; }
virtual bool isBonded() const { return (cb_state_==3); }
virtual void propagateStateInformation(IContactModelMechanical* oldCm,const CAxes &oldSystem=CAxes(),const CAxes &newSystem=CAxes());
virtual void setNonForcePropsFrom(IContactModel *oldCM);
const double & kn() const {return kn_;}
void kn(const double &d) {kn_=d;}
const double & ks() const {return ks_;}
void ks(const double &d) {ks_=d;}
const double & fric() const {return fric_;}
void fric(const double &d) {fric_=d;}
const DVect & lin_F() const {return lin_F_;}
void lin_F(const DVect &f) { lin_F_=f;}
bool lin_S() const {return lin_S_;}
void lin_S(bool b) { lin_S_=b;}
uint lin_mode() const {return lin_mode_;}
void lin_mode(uint i) { lin_mode_=i;}
const double & rgap() const {return rgap_;}
void rgap(const double &d) {rgap_=d;}
uint cb_state() const {return cb_state_;}
void cb_state(uint b) { cb_state_=b;}
const double & cb_tenF() const {return cb_tenF_;}
void cb_tenF(const double &d) {cb_tenF_=d;}
const double & cb_shearF() const {return cb_shearF_;}
void cb_shearF(const double &d) {cb_shearF_=d;}
bool hasDamping() const {return dpProps_ ? true : false;}
double dp_nratio() const {return (hasDamping() ? (dpProps_->dp_nratio_) : 0.0);}
void dp_nratio(const double &d) { if(!hasDamping()) return; dpProps_->dp_nratio_=d;}
double dp_sratio() const {return hasDamping() ? dpProps_->dp_sratio_: 0.0;}
void dp_sratio(const double &d) { if(!hasDamping()) return; dpProps_->dp_sratio_=d;}
int dp_mode() const {return hasDamping() ? dpProps_->dp_mode_: -1;}
void dp_mode(int i) { if(!hasDamping()) return; dpProps_->dp_mode_=i;}
DVect dp_F() const {return hasDamping() ? dpProps_->dp_F_: DVect(0.0);}
void dp_F(const DVect &f) { if(!hasDamping()) return; dpProps_->dp_F_=f;}
bool hasEnergies() const {return energies_ ? true:false;}
double estrain() const {return hasEnergies() ? energies_->estrain_: 0.0;}
void estrain(const double &d) { if(!hasEnergies()) return; energies_->estrain_=d;}
double eslip() const {return hasEnergies() ? energies_->eslip_: 0.0;}
void eslip(const double &d) { if(!hasEnergies()) return; energies_->eslip_=d;}
double edashpot() const {return hasEnergies() ? energies_->edashpot_: 0.0;}
void edashpot(const double &d) { if(!hasEnergies()) return; energies_->edashpot_=d;}
uint inheritanceField() const {return inheritanceField_;}
void inheritanceField(uint i) {inheritanceField_ = i;}
const DVect2 & effectiveTranslationalStiffness() const {return effectiveTranslationalStiffness_;}
void effectiveTranslationalStiffness(const DVect2 &v ) {effectiveTranslationalStiffness_=v;}
private:
static int index_;
struct Energies {
Energies() : estrain_(0.0), eslip_(0.0),edashpot_(0.0) {}
double estrain_; // elastic energy stored in contact
double eslip_; // work dissipated by friction
double edashpot_; // work dissipated by dashpots
};
struct dpProps {
dpProps() : dp_nratio_(0.0), dp_sratio_(0.0), dp_mode_(0), dp_F_(DVect(0.0)) {}
double dp_nratio_; // normal viscous critical damping ratio
double dp_sratio_; // shear viscous critical damping ratio
int dp_mode_; // for viscous mode (0-4) 0 = dashpots, 1 = tensile limit, 2 = shear limit, 3 = limit both
DVect dp_F_; // Force in the dashpots
};
bool updateKn(const IContactMechanical *con);
bool updateKs(const IContactMechanical *con);
bool updateFric(const IContactMechanical *con);
void updateEffectiveStiffness(ContactModelMechanicalState *state);
void setDampCoefficients(const double &mass,double *vcn,double *vcs);
// inheritance fields
quint32 inheritanceField_;
// linear model
double kn_; // normal stiffness
double ks_; // shear stiffness
double fric_; // Coulomb friction coefficient
DVect lin_F_; // Force carried in the linear model
bool lin_S_; // current slip state
uint lin_mode_; // specifies incremental or absolute for the the linear part
double rgap_; // reference gap
uint cb_state_; // Bond state - 0 (NBNF), 1 (NBFT), 2 (NBFS), 3 (B)
double cb_tenF_;
double cb_shearF_;
dpProps * dpProps_; // The viscous properties
Energies * energies_; // energies
DVect2 effectiveTranslationalStiffness_;
};
} // namespace itascaxd
// EoF
|
contactmodellinearcbond.cpp
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#include "contactmodellinearcbond.h"
#include "module/interface/icontactmechanical.h"
#include "module/interface/icontact.h"
#include "module/interface/ipiecemechanical.h"
#include "module/interface/ipiece.h"
#include "../version.txt"
#include "base/src/basetoqt.h"
#include "module/interface/ifishcalllist.h"
#include "utility/src/tptr.h"
#include "shared/src/mathutil.h"
#include "kernel/interface/iprogram.h"
#include "module/interface/icontactthermal.h"
#include "contactmodel/src/contactmodelthermal.h"
#ifdef LINEARCBOND_LIB
int __stdcall DllMain(void *,unsigned, void *)
{
return 1;
}
extern "C" EXPORT_TAG const char *getName()
{
#if DIM==3
return "contactmodelmechanical3dlinearcbond";
#else
return "contactmodelmechanical2dlinearcbond";
#endif
}
extern "C" EXPORT_TAG unsigned getMajorVersion()
{
return MAJOR_VERSION;
}
extern "C" EXPORT_TAG unsigned getMinorVersion()
{
return MINOR_VERSION;
}
extern "C" EXPORT_TAG void *createInstance()
{
cmodelsxd::ContactModelLinearCBond *m = NEWC(cmodelsxd::ContactModelLinearCBond());
return (void *)m;
}
#endif // LINEARCBOND_EXPORTS
namespace cmodelsxd {
static const quint32 linKnMask = 0x00002; // Base 1!
static const quint32 linKsMask = 0x00004;
static const quint32 linFricMask = 0x00008;
using namespace itasca;
int ContactModelLinearCBond::index_ = -1;
UInt ContactModelLinearCBond::getMinorVersion() const { return MINOR_VERSION;}
ContactModelLinearCBond::ContactModelLinearCBond() : inheritanceField_(linKnMask|linKsMask|linFricMask)
, kn_(0.0)
, ks_(0.0)
, fric_(0.0)
, lin_F_(DVect(0.0))
, lin_S_(false)
, lin_mode_(0)
, rgap_(0.0)
, cb_state_(0)
, cb_tenF_(0.0)
, cb_shearF_(0.0)
, dpProps_(0)
, energies_(0)
, effectiveTranslationalStiffness_(DVect2(0.0)) {
// setFromParent(ContactModelMechanicalList::instance()->find(getName()));
}
ContactModelLinearCBond::~ContactModelLinearCBond() {
if (dpProps_)
delete dpProps_;
if (energies_)
delete energies_;
}
void ContactModelLinearCBond::archive(ArchiveStream &stream) {
stream & kn_;
stream & ks_;
stream & fric_;
stream & lin_F_;
stream & lin_S_;
stream & lin_mode_;
stream & cb_state_;
stream & cb_tenF_;
stream & cb_shearF_;
if (stream.getArchiveState()==ArchiveStream::Save) {
bool b = false;
if (dpProps_) {
b = true;
stream & b;
stream & dpProps_->dp_nratio_;
stream & dpProps_->dp_sratio_;
stream & dpProps_->dp_mode_;
stream & dpProps_->dp_F_;
}
else
stream & b;
b = false;
if (energies_) {
b = true;
stream & b;
stream & energies_->estrain_;
stream & energies_->eslip_;
stream & energies_->edashpot_;
}
else
stream & b;
} else {
bool b(false);
stream & b;
if (b) {
if (!dpProps_)
dpProps_ = NEWC(dpProps());
stream & dpProps_->dp_nratio_;
stream & dpProps_->dp_sratio_;
stream & dpProps_->dp_mode_;
stream & dpProps_->dp_F_;
}
stream & b;
if (b) {
if (!energies_)
energies_ = NEWC(Energies());
stream & energies_->estrain_;
stream & energies_->eslip_;
stream & energies_->edashpot_;
}
}
stream & inheritanceField_;
stream & effectiveTranslationalStiffness_;
if (stream.getArchiveState()==ArchiveStream::Save || stream.getRestoreVersion() == getMinorVersion())
stream & rgap_;
}
void ContactModelLinearCBond::copy(const ContactModel *cm) {
ContactModelMechanical::copy(cm);
const ContactModelLinearCBond *in = dynamic_cast<const ContactModelLinearCBond*>(cm);
if (!in) throw std::runtime_error("Internal error: contact model dynamic cast failed.");
kn(in->kn());
ks(in->ks());
fric(in->fric());
lin_F(in->lin_F());
lin_S(in->lin_S());
lin_mode(in->lin_mode());
rgap(in->rgap());
cb_state(in->cb_state());
cb_tenF(in->cb_tenF());
cb_shearF(in->cb_shearF());
if (in->hasDamping()) {
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dp_nratio(in->dp_nratio());
dp_sratio(in->dp_sratio());
dp_mode(in->dp_mode());
dp_F(in->dp_F());
}
if (in->hasEnergies()) {
if (!energies_)
energies_ = NEWC(Energies());
estrain(in->estrain());
eslip(in->eslip());
edashpot(in->edashpot());
}
inheritanceField(in->inheritanceField());
effectiveTranslationalStiffness(in->effectiveTranslationalStiffness());
}
QVariant ContactModelLinearCBond::getProperty(uint i,const IContact *con) const {
QVariant var;
bool nstr = false;
switch (i) {
case kwKn: return kn_;
case kwKs: return ks_;
case kwFric: return fric_;
case kwLinF: var.setValue(lin_F_); return var;
case kwLinS: return lin_S_;
case kwLinMode: return lin_mode_;
case kwRGap: return rgap_;
case kwEmod: {
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
if (c ==nullptr) return 0.0;
double rsq(std::max(c->getEnd1Curvature().y(),c->getEnd2Curvature().y()));
double rsum(0.0);
if (c->getEnd1Curvature().y())
rsum += 1.0/c->getEnd1Curvature().y();
if (c->getEnd2Curvature().y())
rsum += 1.0/c->getEnd2Curvature().y();
#ifdef TWOD
return (kn_ * rsum * rsq / 2.0);
#else
return (kn_ * rsum * rsq * rsq) / dPi;
#endif
}
case kwKRatio: return (ks_ == 0.0) ? 0.0 : (kn_/ks_);
case kwDpNRatio: return dpProps_ ? dpProps_->dp_nratio_ : 0;
case kwDpSRatio: return dpProps_ ? dpProps_->dp_sratio_ : 0;
case kwDpMode: return dpProps_ ? dpProps_->dp_mode_ : 0;
case kwDpF: {
dpProps_ ? var.setValue(dpProps_->dp_F_) : var.setValue(DVect(0.0));
return var;
}
case kwCbState: return cb_state_;
case kwCbTenF: return cb_tenF_;
case kwCbShearF: return cb_shearF_;
case kwCbTStr: nstr = true;
case kwCbSStr: {
const IContactMechanical *c(convert_getcast<IContactMechanical>(con));
if (c ==nullptr) return 0.0;
double tmp(std::max(c->getEnd1Curvature().y(),c->getEnd2Curvature().y()));
if (nstr) {
#ifdef TWOD
return (cb_tenF_ * tmp / 2.0);
#else
return (cb_tenF_ * tmp * tmp / dPi);
#endif
} else {
#ifdef TWOD
return (cb_shearF_ * tmp / 2.0);
#else
return (cb_shearF_ * tmp * tmp / dPi);
#endif
}
}
}
assert(0);
return QVariant();
}
bool ContactModelLinearCBond::getPropertyGlobal(uint i) const {
switch (i) {
case kwLinF:
case kwDpF:
return false;
}
return true;
}
bool ContactModelLinearCBond::setProperty(uint i,const QVariant &v,IContact *) {
dpProps dp;
switch (i) {
case kwKn: {
if (!v.canConvert<double>())
throw Exception("kn must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative kn not allowed.");
kn_ = val;
return true;
}
case kwKs: {
if (!v.canConvert<double>())
throw Exception("ks must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative ks not allowed.");
ks_ = val;
return true;
}
case kwFric: {
if (!v.canConvert<double>())
throw Exception("fric must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative fric not allowed.");
fric_ = val;
return false;
}
case kwCbTenF: {
if (!v.canConvert<double>())
throw Exception("cb_tenf must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative cb_tenf not allowed.");
cb_tenF_ = val;
return false;
}
case kwCbShearF: {
if (!v.canConvert<double>())
throw Exception("cb_shearf must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative cb_shearf not allowed.");
cb_shearF_ = val;
return false;
}
case kwLinF: {
if (!v.canConvert<DVect>())
throw Exception("lin_force must be a vector.");
DVect val(v.value<DVect>());
lin_F_ = val;
return false;
}
case kwLinMode: {
if (!v.canConvert<uint>())
throw Exception("lin_mode must be 0 (absolute) or 1 (incremental).");
uint val(v.toUInt());
if (val>1)
throw Exception("lin_mode must be 0 (absolute) or 1 (incremental).");
lin_mode_ = val;
return false;
}
case kwRGap: {
if (!v.canConvert<double>())
throw Exception("Reference gap must be a double.");
double val(v.toDouble());
rgap_ = val;
return false;
}
case kwDpNRatio: {
if (!v.canConvert<double>())
throw Exception("dp_nratio must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative dp_nratio not allowed.");
if (val == 0.0 && !dpProps_)
return false;
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dpProps_->dp_nratio_ = val;
return true;
}
case kwDpSRatio: {
if (!v.canConvert<double>())
throw Exception("dp_sratio must be a double.");
double val(v.toDouble());
if (val<0.0)
throw Exception("Negative dp_sratio not allowed.");
if (val == 0.0 && !dpProps_)
return false;
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dpProps_->dp_sratio_ = val;
return true;
}
case kwDpMode: {
if (!v.canConvert<int>())
throw Exception("The viscous mode dp_mode must be 0, 1, 2, or 3.");
int val(v.toInt());
if (val == 0 && !dpProps_)
return false;
if (val < 0 || val > 3)
throw Exception("The dashpot mode dp_mode must be 0, 1, 2, or 3.");
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dpProps_->dp_mode_ = val;
return false;
}
case kwDpF: {
if (!v.canConvert<DVect>())
throw Exception("dp_force must be a vector.");
DVect val(v.value<DVect>());
if (val.fsum() == 0.0 && !dpProps_)
return false;
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dpProps_->dp_F_ = val;
return false;
}
}
return false;
}
bool ContactModelLinearCBond::getPropertyReadOnly(uint i) const {
switch (i) {
case kwDpF:
case kwLinS:
case kwEmod:
case kwKRatio:
case kwCbState:
case kwCbTStr:
case kwCbSStr:
return true;
default:
break;
}
return false;
}
bool ContactModelLinearCBond::supportsInheritance(uint i) const {
switch (i) {
case kwKn:
case kwKs:
case kwFric:
return true;
default:
break;
}
return false;
}
QString ContactModelLinearCBond::getMethodArguments(uint i) const {
switch (i) {
case kwCbBond:
return "gap";
case kwDeformability:
return "emod,kratio";
case kwCbStrength:
return "tensile,shear";
case kwCbUnbond:
return "gap";
}
assert(0);
return "";
}
bool ContactModelLinearCBond::setMethod(uint i,const QVector<QVariant> &vl,IContact *con) {
IContactMechanical *c(convert_getcast<IContactMechanical>(con));
switch (i) {
case kwCbBond: {
if (cb_state_ == 3) return false;
double mingap = -1.0 * limits<double>::max();
double maxgap = 0;
if (vl.at(0).canConvert<Double>())
maxgap = vl.at(0).toDouble();
else if (vl.at(0).canConvert<DVect2>()) {
DVect2 value = vl.at(0).value<DVect2>();
mingap = value.minComp();
maxgap = value.maxComp();
} else if (!vl.at(0).isNull())
throw Exception("gap value %1 not recognized in method bond in contact model %2.",vl.at(0),getName());
double gap = c->getGap();
if ( gap >= mingap && gap <= maxgap)
cb_state_ = 3;
return false;
}
case kwCbUnbond: {
if (cb_state_ == 0) return false;
double mingap = -1.0 * limits<double>::max();
double maxgap = 0;
if (vl.at(0).canConvert<double>())
maxgap = vl.at(0).toDouble();
else if (vl.at(0).canConvert<DVect2>()) {
DVect2 value = vl.at(0).value<DVect2>();
mingap = value.minComp();
maxgap = value.maxComp();
}
else if (!vl.at(0).isNull())
throw Exception("gap value %1 not recognized in method unbond in contact model %2.",vl.at(0),getName());
double gap = c->getGap();
if ( gap >= mingap && gap <= maxgap)
cb_state_ = 0;
return false;
}
case kwDeformability: {
double emod(0.0);
double krat(0.0);
if (vl.at(0).isNull())
throw Exception("Argument emod must be specified with method deformability in contact model %1.",getName());
emod = vl.at(0).toDouble();
if (emod<0.0)
throw Exception("Negative emod not allowed in contact model %1.",getName());
if (vl.at(1).isNull())
throw Exception("Argument kratio must be specified with method deformability in contact model %1.",getName());
krat = vl.at(1).toDouble();
if (krat<0.0)
throw Exception("Negative linear stiffness ratio not allowed in contact model %1.",getName());
double rsq(std::max(c->getEnd1Curvature().y(),c->getEnd2Curvature().y()));
double rsum(0.0);
if (c->getEnd1Curvature().y())
rsum += 1.0/c->getEnd1Curvature().y();
if (c->getEnd2Curvature().y())
rsum += 1.0/c->getEnd2Curvature().y();
#ifdef TWOD
kn_ = 2.0 * emod / (rsq * rsum);
#else
kn_ = dPi * emod / (rsq * rsq * rsum);
#endif
ks_ = (krat == 0.0) ? 0.0 : kn_ / krat;
setInheritance(1,false);
setInheritance(2,false);
return true;
}
case kwCbStrength: {
if (cb_state_ != 3) return false;
double nval(0.0);
double sval(0.0);
if (vl.at(0).isNull())
throw Exception("tensile value must be specified with method cb_strength in contact model %1.",getName());
nval = vl.at(0).toDouble();
if (nval<0.0)
throw Exception("Negative tensile strength not allowed in contact model %1.",getName());
if (vl.at(1).isNull())
throw Exception("shear value must be specified with method cb_strength in contact model %1.",getName());
sval = vl.at(1).toDouble();
if (sval<0.0)
throw Exception("Negative shear strength not allowed in contact model %1.",getName());
double tmp(std::max(c->getEnd1Curvature().y(),c->getEnd2Curvature().y()));
#ifdef TWOD
cb_tenF_ = nval * 2.0 / tmp;
cb_shearF_ = sval * 2.0 / tmp;
#else
cb_tenF_ = nval * dPi / ( tmp * tmp );
cb_shearF_ = sval * dPi / (tmp * tmp);
#endif
return false;
}
}
return false;
}
double ContactModelLinearCBond::getEnergy(uint i) const {
double ret(0.0);
if (!energies_)
return ret;
switch (i) {
case kwEStrain: return energies_->estrain_;
case kwESlip: return energies_->eslip_;
case kwEDashpot: return energies_->edashpot_;
}
assert(0);
return ret;
}
bool ContactModelLinearCBond::getEnergyAccumulate(uint i) const {
switch (i) {
case kwEStrain: return false;
case kwESlip: return true;
case kwEDashpot: return true;
}
assert(0);
return false;
}
void ContactModelLinearCBond::setEnergy(uint i,const double &d) {
if (!energies_) return;
switch (i) {
case kwEStrain: energies_->estrain_ = d; return;
case kwESlip: energies_->eslip_ = d; return;
case kwEDashpot: energies_->edashpot_= d; return;
}
assert(0);
return;
}
bool ContactModelLinearCBond::validate(ContactModelMechanicalState *state,const double &) {
assert(state);
const IContactMechanical *c = state->getMechanicalContact();
assert(c);
if (state->trackEnergy_)
activateEnergy();
if (inheritanceField_ & linKnMask)
updateKn(c);
if (inheritanceField_ & linKsMask)
updateKs(c);
if (inheritanceField_ & linFricMask)
updateFric(c);
updateEffectiveStiffness(state);
return checkActivity(state->gap_);
}
static const QString knstr("kn");
bool ContactModelLinearCBond::updateKn(const IContactMechanical *con) {
assert(con);
QVariant v1 = con->getEnd1()->getProperty(knstr);
QVariant v2 = con->getEnd2()->getProperty(knstr);
if (!v1.isValid() || !v2.isValid())
return false;
double kn1 = v1.toDouble();
double kn2 = v2.toDouble();
double val = kn_;
if (kn1 && kn2)
kn_ = kn1*kn2/(kn1+kn2);
else if (kn1)
kn_ = kn1;
else if (kn2)
kn_ = kn2;
return ( (kn_ != val) );
}
static const QString ksstr("ks");
bool ContactModelLinearCBond::updateKs(const IContactMechanical *con) {
assert(con);
QVariant v1 = con->getEnd1()->getProperty(ksstr);
QVariant v2 = con->getEnd2()->getProperty(ksstr);
if (!v1.isValid() || !v2.isValid())
return false;
double ks1 = v1.toDouble();
double ks2 = v2.toDouble();
double val = ks_;
if (ks1 && ks2)
ks_ = ks1*ks2/(ks1+ks2);
else if (ks1)
ks_ = ks1;
else if (ks2)
ks_ = ks2;
return ( (ks_ != val) );
}
static const QString fricstr("fric");
bool ContactModelLinearCBond::updateFric(const IContactMechanical *con) {
assert(con);
QVariant v1 = con->getEnd1()->getProperty(fricstr);
QVariant v2 = con->getEnd2()->getProperty(fricstr);
if (!v1.isValid() || !v2.isValid())
return false;
double fric1 = std::max(0.0,v1.toDouble());
double fric2 = std::max(0.0,v2.toDouble());
double val = fric_;
fric_ = std::min(fric1,fric2);
return ( (fric_ != val) );
}
bool ContactModelLinearCBond::endPropertyUpdated(const QString &name,const IContactMechanical *c) {
assert(c);
QStringList availableProperties = getProperties().simplified().replace(" ","").split(",",QString::SkipEmptyParts);
QRegExp rx(name,Qt::CaseInsensitive);
int idx = availableProperties.indexOf(rx)+1;
bool ret=false;
if (idx<=0)
return ret;
switch(idx) {
case kwKn: { //kn
if (inheritanceField_ & linKnMask)
ret = updateKn(c);
break;
}
case kwKs: { //ks
if (inheritanceField_ & linKsMask)
ret =updateKs(c);
break;
}
case kwFric: { //fric
if (inheritanceField_ & linFricMask)
updateFric(c);
break;
}
}
return ret;
}
void ContactModelLinearCBond::updateEffectiveStiffness(ContactModelMechanicalState *) {
DVect2 ret(kn_,ks_);
// correction if viscous damping active
if (dpProps_) {
DVect2 correct(1.0);
if (dpProps_->dp_nratio_)
correct.rx() = sqrt(1.0+dpProps_->dp_nratio_*dpProps_->dp_nratio_) - dpProps_->dp_nratio_;
if (dpProps_->dp_sratio_)
correct.ry() = sqrt(1.0+dpProps_->dp_sratio_*dpProps_->dp_sratio_) - dpProps_->dp_sratio_;
ret /= (correct*correct);
}
effectiveTranslationalStiffness_ = ret;
}
bool ContactModelLinearCBond::forceDisplacementLaw(ContactModelMechanicalState *state,const double ×tep) {
assert(state);
double overlap = rgap_ - state->gap_;
DVect trans = state->relativeTranslationalIncrement_;
double correction = 1.0;
if (state->activated()) {
if (cmEvents_[fActivated] >= 0) {
FArray<QVariant,2> arg;
QVariant v;
IContact * c = const_cast<IContact*>(state->getContact());
TPtr<IThing> t(c->getIThing());
v.setValue(t);
arg.push_back(v);
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fActivated]);
}
if (lin_mode_ == 0 && trans.x()) {
correction = -1.0*overlap / trans.x();
if (correction < 0)
correction = 1.0;
}
}
#ifdef THREED
DVect norm(trans.x(),0.0,0.0);
#else
DVect norm(trans.x(),0.0);
#endif
DAVect ang = state->relativeAngularIncrement_;
DVect lin_F_old = lin_F_;
if (lin_mode_ == 0)
lin_F_.rx() = overlap * kn_;
else
lin_F_.rx() -= correction * norm.x() * kn_;
DVect u_s = trans;
u_s.rx() = 0.0;
DVect sforce = lin_F_ - u_s * ks_ * correction;
sforce.rx() = 0.0;
// Resolve failure (contact bonds and friction)
if (state->canFail_) {
// Resolve contact bond failure - done first so that this way, even if breaks, one can ensure a valid sliding state
if (cb_state_ == 3) { // bonded - Note: this means that isSliding is false!
if (lin_F_.x() <= -cb_tenF_) {
// Broke in tension
cb_state_ = 1;
if (cmEvents_[fBondBreak] >= 0) {
FArray<QVariant,3> arg;
QVariant p1;
IContact * c = const_cast<IContact*>(state->getContact());
TPtr<IThing> t(c->getIThing());
p1.setValue(t);
arg.push_back(p1);
p1.setValue(cb_state_);
arg.push_back(p1);
p1.setValue(cb_tenF_);
arg.push_back(p1);
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fBondBreak]);
}
} else if (sforce.mag() >= cb_shearF_) {
// Broke in shear
cb_state_ = 2;
if (cmEvents_[fBondBreak] >= 0) {
FArray<QVariant,3> arg;
QVariant p1;
IContact * c = const_cast<IContact*>(state->getContact());
TPtr<IThing> t(c->getIThing());
p1.setValue(t);
arg.push_back(p1);
p1.setValue(cb_state_);
arg.push_back(p1);
p1.setValue(cb_shearF_);
arg.push_back(p1);
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fBondBreak]);
}
}
}
// 2) Resolve sliding if no contact bond exists
if (cb_state_ < 3) {
// No contact bond - normal force is positive only
lin_F_.rx() = std::max(0.0,lin_F_.x());
// No contact bond - sliding can occur
double crit = lin_F_.x() * fric_;
double sfmag = sforce.mag();
if (sfmag > crit) {
double rat = crit / sfmag;
sforce *= rat;
if (!lin_S_ && cmEvents_[fSlipChange] >= 0) {
FArray<QVariant,3> arg;
QVariant p1;
IContact * c = const_cast<IContact*>(state->getContact());
TPtr<IThing> t(c->getIThing());
p1.setValue(t);
arg.push_back(p1);
p1.setValue(0);
arg.push_back(p1);
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fSlipChange]);
}
lin_S_ = true;
} else {
if (lin_S_) {
if (cmEvents_[fSlipChange] >= 0) {
FArray<QVariant,3> arg;
QVariant p1;
IContact * c = const_cast<IContact*>(state->getContact());
TPtr<IThing> t(c->getIThing());
p1.setValue(t);
arg.push_back(p1);
p1.setValue(1);
arg.push_back(p1);
IFishCallList *fi = const_cast<IFishCallList*>(state->getProgram()->findInterface<IFishCallList>());
fi->setCMFishCallArguments(c,arg,cmEvents_[fSlipChange]);
}
lin_S_ = false;
}
}
}
}
sforce.rx() = lin_F_.x();
lin_F_ = sforce; // total force in linear contact model
state->force_ = lin_F_;
// 3) Account for dashpot forces
if (dpProps_) {
dpProps_->dp_F_.fill(0.0);
double vcn(0.0), vcs(0.0);
setDampCoefficients(state->inertialMass_,&vcn,&vcs);
// First damp all components
dpProps_->dp_F_ = u_s * (-1.0* vcs) / timestep; // shear component
dpProps_->dp_F_ -= norm * vcn / timestep; // normal component
// Need to change behavior based on the dp_mode
if (cb_state_ !=3 && (dpProps_->dp_mode_ == 1 || dpProps_->dp_mode_ == 3)) { // limit the tensile if not bonded
if (dpProps_->dp_F_.x() + lin_F_.x() < 0)
dpProps_->dp_F_.rx() = - lin_F_.rx();
}
if (lin_S_ && dpProps_->dp_mode_ > 1) { // limit the shear if not sliding
double dfn = dpProps_->dp_F_.rx();
dpProps_->dp_F_.fill(0.0);
dpProps_->dp_F_.rx() = dfn;
}
state->force_ += dpProps_->dp_F_;
}
// 5) Compute energies
if (state->trackEnergy_) {
assert(energies_);
energies_->estrain_ = 0.0;
if (kn_)
energies_->estrain_ = 0.5*lin_F_.x()*lin_F_.x()/kn_;
if (ks_) {
DVect s = lin_F_;
s.rx() = 0.0;
double smag2 = s.mag2();
energies_->estrain_ += 0.5*smag2 / ks_;
if (lin_S_) {
lin_F_old.rx() = 0.0;
DVect avg_F_s = (s + lin_F_old)*0.5;
DVect u_s_el = (s - lin_F_old) / ks_;
energies_->eslip_ -= std::min(0.0,(avg_F_s | (u_s + u_s_el)));
}
}
if (dpProps_) {
energies_->edashpot_ -= dpProps_->dp_F_ | trans;
}
}
state->momentOn1_.fill(0.0);
state->momentOn2_.fill(0.0);
// The state force has been updated - update the state with the resulting torques
state->getMechanicalContact()->updateResultingTorquesLocal(state->force_,&state->momentOn1_,&state->momentOn2_);
assert(lin_F_ == lin_F_);
return checkActivity(state->gap_);
}
void ContactModelLinearCBond::propagateStateInformation(IContactModelMechanical* old,const CAxes &oldSystem,const CAxes &newSystem) {
// Only do something if the contact model is of the same type
if (old->getContactModel()->getName().compare("linearcbond",Qt::CaseInsensitive) == 0 && !isBonded()) {
ContactModelLinearCBond *oldCm = (ContactModelLinearCBond *)old;
#ifdef THREED
// Need to rotate just the shear component from oldSystem to newSystem
// Step 1 - rotate oldSystem so that the normal is the same as the normal of newSystem
DVect axis = oldSystem.e1() & newSystem.e1();
double c, ang, s;
DVect re2;
if (!checktol(axis.abs().maxComp(),0.0,1.0,1000)) {
axis = axis.unit();
c = oldSystem.e1()|newSystem.e1();
if (c > 0)
c = std::min(c,1.0);
else
c = std::max(c,-1.0);
ang = acos(c);
s = sin(ang);
double t = 1. - c;
DMatrix<3,3> rm;
rm.get(0,0) = t*axis.x()*axis.x() + c;
rm.get(0,1) = t*axis.x()*axis.y() - axis.z()*s;
rm.get(0,2) = t*axis.x()*axis.z() + axis.y()*s;
rm.get(1,0) = t*axis.x()*axis.y() + axis.z()*s;
rm.get(1,1) = t*axis.y()*axis.y() + c;
rm.get(1,2) = t*axis.y()*axis.z() - axis.x()*s;
rm.get(2,0) = t*axis.x()*axis.z() - axis.y()*s;
rm.get(2,1) = t*axis.y()*axis.z() + axis.x()*s;
rm.get(2,2) = t*axis.z()*axis.z() + c;
re2 = rm*oldSystem.e2();
}
else
re2 = oldSystem.e2();
// Step 2 - get the angle between the oldSystem rotated shear and newSystem shear
axis = re2 & newSystem.e2();
DVect2 tpf;
DMatrix<2,2> m;
if (!checktol(axis.abs().maxComp(),0.0,1.0,1000)) {
axis = axis.unit();
c = re2|newSystem.e2();
if (c > 0)
c = std::min(c,1.0);
else
c = std::max(c,-1.0);
ang = acos(c);
if (!checktol(axis.x(),newSystem.e1().x(),1.0,100))
ang *= -1;
s = sin(ang);
m.get(0,0) = c;
m.get(1,0) = s;
m.get(0,1) = -m.get(1,0);
m.get(1,1) = m.get(0,0);
tpf = m*DVect2(oldCm->lin_F_.y(),oldCm->lin_F_.z());
} else {
m.get(0,0) = 1.;
m.get(0,1) = 0.;
m.get(1,0) = 0.;
m.get(1,1) = 1.;
tpf = DVect2(oldCm->lin_F_.y(),oldCm->lin_F_.z());
}
DVect pforce = DVect(0,tpf.x(),tpf.y());
#else
oldSystem;
newSystem;
DVect pforce = DVect(0,oldCm->lin_F_.y());
#endif
for (int i=1; i<dim; ++i)
lin_F_.rdof(i) += pforce.dof(i);
oldCm->lin_F_ = DVect(0.0);
if (dpProps_ && oldCm->dpProps_) {
#ifdef THREED
tpf = m*DVect2(oldCm->dpProps_->dp_F_.y(),oldCm->dpProps_->dp_F_.z());
pforce = DVect(oldCm->dpProps_->dp_F_.x(),tpf.x(),tpf.y());
#else
pforce = oldCm->dpProps_->dp_F_;
#endif
dpProps_->dp_F_ += pforce;
oldCm->dpProps_->dp_F_ = DVect(0.0);
}
if(oldCm->getEnergyActivated()) {
activateEnergy();
energies_->estrain_ = oldCm->energies_->estrain_;
energies_->eslip_ = oldCm->energies_->eslip_;
energies_->edashpot_ = oldCm->energies_->edashpot_;
oldCm->energies_->estrain_ = 0.0;
oldCm->energies_->edashpot_ = 0.0;
oldCm->energies_->eslip_ = 0.0;
}
rgap_ = oldCm->rgap_;
}
assert(lin_F_ == lin_F_);
}
void ContactModelLinearCBond::setNonForcePropsFrom(IContactModel *old) {
// Only do something if the contact model is of the same type
if (old->getName().compare("linearcbond",Qt::CaseInsensitive) == 0 && !isBonded()) {
ContactModelLinearCBond *oldCm = (ContactModelLinearCBond *)old;
kn_ = oldCm->kn_;
ks_ = oldCm->ks_;
fric_ = oldCm->fric_;
lin_mode_ = oldCm->lin_mode_;
rgap_ = oldCm->rgap_;
if (oldCm->dpProps_) {
if (!dpProps_)
dpProps_ = NEWC(dpProps());
dpProps_->dp_nratio_ = oldCm->dpProps_->dp_nratio_;
dpProps_->dp_sratio_ = oldCm->dpProps_->dp_sratio_;
dpProps_->dp_mode_ = oldCm->dpProps_->dp_mode_;
}
}
}
void ContactModelLinearCBond::setDampCoefficients(const double &mass,double *vcn,double *vcs) {
*vcn = dpProps_->dp_nratio_ * 2.0 * sqrt(mass*(kn_));
*vcs = dpProps_->dp_sratio_ * 2.0 * sqrt(mass*(ks_));
}
} // namespace itascaxd
// EoF
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