void
J2Mat :: computeKGradientVector(FloatArray &answer, functType ftype, int isurf, GaussPoint *gp, FloatArray &fullStressVector,
const FloatArray &strainSpaceHardeningVariables)
{
int i, kcount = 0, size = this->giveSizeOfReducedHardeningVarsVector(gp);
FloatArray reducedKinematicGrad;
if ( !hasHardening() ) {
answer.resize(0);
return;
}
answer.resize(size);
/* kinematic hardening variables first */
if ( this->kinematicHardeningFlag ) {
this->computeReducedStressGradientVector(reducedKinematicGrad, ftype, isurf, gp, fullStressVector, strainSpaceHardeningVariables);
kcount = reducedKinematicGrad.giveSize();
for ( i = 1; i <= kcount; i++ ) {
answer.at(i) = ( -1.0 ) * this->kinematicModuli * reducedKinematicGrad.at(i);
}
}
if ( this->isotropicHardeningFlag ) {
answer.at(size) = ( -1.0 ) * this->isotropicModuli;
}
}
void
J2MPlasticMaterial :: computeHardeningReducedModuli(FloatMatrix &answer, GaussPoint *gp,
const FloatArray &strainSpaceHardeningVariables,
TimeStep *tStep)
{
/* computes hardening moduli in reduced stress strain space (for kinematic back-stress)*/
int size = this->giveSizeOfReducedHardeningVarsVector(gp);
if ( !hasHardening() ) {
answer.clear();
return;
}
answer.resize(size, size);
answer.zero();
/* kinematic hardening variables are first */
if ( this->kinematicHardeningFlag ) {
int ksize = StructuralMaterial :: giveSizeOfVoigtSymVector( gp->giveMaterialMode() );
for ( int i = 1; i <= ksize; i++ ) {
answer.at(i, i) = this->kinematicModuli;
}
}
if ( this->isotropicHardeningFlag ) {
answer.at(size, size) = this->isotropicModuli;
}
}
FloatArray *
J2plasticMaterial :: ComputeStressSpaceHardeningVarsReducedGradient(GaussPoint *gp, FloatArray *stressVector,
FloatArray *stressSpaceHardeningVars)
{
/* computes stress space hardening gradient in reduced stress-strain space */
int i, kcount = 0, size = this->giveSizeOfReducedHardeningVarsVector(gp);
//double f,ax,ay,az,sx,sy,sz;
FloatArray *answer;
FloatArray *fullKinematicGradient, reducedKinematicGrad;
StructuralCrossSection *crossSection = ( StructuralCrossSection * )
( gp->giveElement()->giveCrossSection() );
if ( !hasHardening() ) {
return NULL;
}
answer = new FloatArray(size);
/* kinematic hardening variables first */
if ( this->kinematicHardeningFlag ) {
fullKinematicGradient = this->ComputeStressGradient(gp, stressVector, stressSpaceHardeningVars);
crossSection->giveReducedCharacteristicVector(reducedKinematicGrad, gp, * fullKinematicGradient);
delete fullKinematicGradient;
kcount = reducedKinematicGrad.giveSize();
}
if ( this->kinematicHardeningFlag ) {
for ( i = 1; i <= kcount; i++ ) {
answer->at(i) = reducedKinematicGrad.at(i);
}
}
if ( this->isotropicHardeningFlag ) {
answer->at(size) = sqrt(1. / 3.);
}
return answer;
}
FloatArray *
J2plasticMaterial :: ComputeStressSpaceHardeningVars(GaussPoint *gp,
FloatArray *strainSpaceHardeningVariables)
{
// in full stress strain space
int i;
int count = 0, size = this->giveSizeOfFullHardeningVarsVector(), isize, rSize;
IntArray mask;
if ( !hasHardening() ) {
return NULL;
}
FloatArray *answer = new FloatArray(size);
this->giveStressStrainMask( mask, ReducedForm, gp->giveMaterialMode() );
isize = mask.giveSize();
rSize = this->giveSizeOfReducedHardeningVarsVector(gp);
/* kinematic hardening variables are first */
if ( this->kinematicHardeningFlag ) {
for ( i = 1; i <= isize; i++ ) {
// to be consistent with equivalent plastic strain formulation
// we multiply by (sqrt(2.)*2./3.)
answer->at( mask.at(i) ) = ( sqrt(2.) * 2. / 3. ) * this->kinematicModuli * strainSpaceHardeningVariables->at(i);
}
count = 6;
}
if ( this->isotropicHardeningFlag ) {
answer->at(count + 1) = this->isotropicModuli *
strainSpaceHardeningVariables->at(rSize);
}
answer->negated();
return answer;
}
void
J2MPlasticMaterial :: computeStressSpaceHardeningVarsReducedGradient(FloatArray &answer, functType ftype, int isurf, GaussPoint *gp,
const FloatArray &stressVector,
const FloatArray &stressSpaceHardeningVars)
{
/* computes stress space hardening gradient in reduced stress-strain space */
int kcount = 0, size = this->giveSizeOfReducedHardeningVarsVector(gp);
//double f,ax,ay,az,sx,sy,sz;
FloatArray fullKinematicGradient, reducedKinematicGrad;
if ( !hasHardening() ) {
answer.clear();
return;
}
answer.resize(size);
/* kinematic hardening variables first */
if ( this->kinematicHardeningFlag ) {
this->computeStressGradientVector(fullKinematicGradient, ftype, isurf, gp, stressVector, stressSpaceHardeningVars);
StructuralMaterial :: giveReducedSymVectorForm( reducedKinematicGrad, fullKinematicGradient, gp->giveMaterialMode() );
kcount = reducedKinematicGrad.giveSize();
}
if ( this->kinematicHardeningFlag ) {
for ( int i = 1; i <= kcount; i++ ) {
answer.at(i) = reducedKinematicGrad.at(i);
}
}
if ( this->isotropicHardeningFlag ) {
answer.at(size) = sqrt(1. / 3.);
}
}
void
J2MPlasticMaterial :: computeStressSpaceHardeningVars(FloatArray &answer, GaussPoint *gp,
const FloatArray &strainSpaceHardeningVariables)
{
// in full stress strain space
int count = 0, size = this->giveSizeOfFullHardeningVarsVector(), isize, rSize;
IntArray mask;
if ( !hasHardening() ) {
answer.clear();
return;
}
answer.resize(size);
StructuralMaterial :: giveVoigtSymVectorMask( mask, gp->giveMaterialMode() );
isize = mask.giveSize();
rSize = this->giveSizeOfReducedHardeningVarsVector(gp);
/* kinematic hardening variables are first */
if ( this->kinematicHardeningFlag ) {
for ( int i = 1; i <= isize; i++ ) {
// to be consistent with equivalent plastic strain formulation
// we multiply by (sqrt(2.)*2./3.)
answer.at( mask.at(i) ) = ( sqrt(2.) * 2. / 3. ) * this->kinematicModuli * strainSpaceHardeningVariables.at(i);
}
count = 6;
}
if ( this->isotropicHardeningFlag ) {
answer.at(count + 1) = this->isotropicModuli *
strainSpaceHardeningVariables.at(rSize);
}
answer.negated();
}
