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material_damage_iterative.cc
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			/**
			* @file material_damage_iterative.cc
			*
			* @author Aurelia Isabel Cuba Ramos <aurelia.cubaramos@epfl.ch>
			*
			*
			* @brief Specialization of the class material damage to damage only one gauss
			* point at a time and propagate damage in a linear way. Max principal stress
			* criterion is used as a failure criterion.
			*
			* @section LICENSE
			*
			* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
			* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
			*
			*/

			/* -------------------------------------------------------------------------- */
			#include "material_damage_iterative.hh"
			#include "solid_mechanics_model_RVE.hh"

			namespace akantu {

			/* -------------------------------------------------------------------------- */
			template<UInt spatial_dimension>
			MaterialDamageIterative<spatial_dimension>::MaterialDamageIterative(SolidMechanicsModel & model,
			const ID & id) :
			Material(model, id),
			MaterialDamage<spatial_dimension>(model, id),
			Sc("Sc", *this),
			reduction_step("damage_step", *this),
			equivalent_stress("equivalent_stress", *this),
			max_reductions(0),
			norm_max_equivalent_stress(0) {
			AKANTU_DEBUG_IN();

			this->registerParam("Sc", Sc, _pat_parsable, "critical stress threshold");
			this->registerParam("prescribed_dam", prescribed_dam, 0.1, _pat_parsable \| _pat_modifiable, "prescribed damage" );
			this->registerParam("dam_threshold", dam_threshold, 0.8, _pat_parsable \| _pat_modifiable, "damage threshold at which damage damage will be set to 1" );
			this->registerParam("dam_tolerance", dam_tolerance, 0.01, _pat_parsable \| _pat_modifiable, "damage tolerance to decide if quadrature point will be damageed" );
			this->registerParam("max_damage", max_damage, 0.99999, _pat_parsable \| _pat_modifiable, "maximum damage value" );
			this->registerParam("max_reductions", max_reductions, UInt(10), _pat_parsable \| _pat_modifiable, "max reductions");

			this->use_previous_stress = true;
			this->use_previous_gradu = true;
			this->Sc.initialize(1);
			this->equivalent_stress.initialize(1);
			this->reduction_step.initialize(1);

			AKANTU_DEBUG_OUT();
			}
			/* -------------------------------------------------------------------------- */
			template<UInt spatial_dimension>
			void MaterialDamageIterative<spatial_dimension>::computeNormalizedEquivalentStress(const Array<Real> & grad_u,
			ElementType el_type,
			GhostType ghost_type) {
			AKANTU_DEBUG_IN();
			/// Vector to store eigenvalues of current stress tensor
			Vector<Real> eigenvalues(spatial_dimension);

			Array<Real>::const_iterator<Real> Sc_it = Sc(el_type, ghost_type).begin();
			Array<Real>::iterator<Real> equivalent_stress_it = equivalent_stress(el_type, ghost_type).begin();

			Array<Real>::const_matrix_iterator grad_u_it = grad_u.begin(spatial_dimension,
			spatial_dimension);
			Array<Real>::const_matrix_iterator grad_u_end = grad_u.end(spatial_dimension,
			spatial_dimension);
			Real * dam = this->damage(el_type, ghost_type).storage();
			Matrix<Real> sigma(spatial_dimension, spatial_dimension);
			for(;grad_u_it != grad_u_end; ++ grad_u_it) {
			sigma.clear();
			MaterialElastic<spatial_dimension>::computeStressOnQuad(*grad_u_it, sigma, 0.);
			computeDamageAndStressOnQuad(sigma,*dam);

			/// compute eigenvalues
			sigma.eig(eigenvalues);
			/// find max eigenvalue and normalize by tensile strength
			equivalent_stress_it = (std::max_element(eigenvalues.storage(),
			eigenvalues.storage() + spatial_dimension)) / *(Sc_it);
			++Sc_it;
			++equivalent_stress_it;
			++dam;
			}

			AKANTU_DEBUG_OUT();
			}
			/* -------------------------------------------------------------------------- */
			template<UInt spatial_dimension>
			void MaterialDamageIterative<spatial_dimension>::computeAllStresses(GhostType ghost_type) {
			AKANTU_DEBUG_IN();
			/// reset normalized maximum equivalent stress
			if(ghost_type==_not_ghost)
			norm_max_equivalent_stress = 0;

			MaterialDamage<spatial_dimension>::computeAllStresses(ghost_type);

			/// find global Gauss point with highest stress
			const SolidMechanicsModelRVE * rve_model = dynamic_cast<const SolidMechanicsModelRVE *>(this->model);
			if (rve_model == NULL) {
			/// is no RVE model
			StaticCommunicator & comm = akantu::StaticCommunicator::getStaticCommunicator();
			comm.allReduce(&norm_max_equivalent_stress, 1, _so_max);
			}
			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			template<UInt spatial_dimension>
			void MaterialDamageIterative<spatial_dimension>::findMaxNormalizedEquivalentStress(ElementType el_type,
			GhostType ghost_type) {
			AKANTU_DEBUG_IN();

			if(ghost_type==_not_ghost) {

			// const Array<Real> & e_stress = equivalent_stress(el_type);

			// if (e_stress.begin() != e_stress.end() ) {
			// Array<Real>::const_iterator<Real> equivalent_stress_it_max = std::max_element(e_stress.begin(),e_stress.end());
			// /// check if max equivalent stress for this element type is greater than the current norm_max_eq_stress
			// if (*equivalent_stress_it_max > norm_max_equivalent_stress)
			// norm_max_equivalent_stress = *equivalent_stress_it_max;
			// }
			const Array<Real> & e_stress = equivalent_stress(el_type);
			Array<Real>::const_iterator<Real> equivalent_stress_it = e_stress.begin();
			Array<Real>::const_iterator<Real> equivalent_stress_end = e_stress.end();
			Array<Real> & dam = this->damage(el_type);
			Array<Real>::iterator<Real> dam_it = dam.begin();


			for (; equivalent_stress_it != equivalent_stress_end; ++equivalent_stress_it, ++dam_it ) {
			/// check if max equivalent stress for this element type is greater than the current norm_max_eq_stress and if the element is not already fully damaged
			if (equivalent_stress_it > norm_max_equivalent_stress && dam_it < max_damage) {
			norm_max_equivalent_stress = *equivalent_stress_it;
			}

			}



			}
			AKANTU_DEBUG_OUT();
			}
			/* -------------------------------------------------------------------------- */
			template<UInt spatial_dimension>
			void MaterialDamageIterative<spatial_dimension>::computeStress(ElementType el_type,
			GhostType ghost_type) {
			AKANTU_DEBUG_IN();


			MaterialDamage<spatial_dimension>::computeStress(el_type, ghost_type);

			Real * dam = this->damage(el_type, ghost_type).storage();

			MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, ghost_type);

			computeDamageAndStressOnQuad(sigma,*dam);
			++dam;

			MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;

			computeNormalizedEquivalentStress(this->gradu(el_type, ghost_type), el_type, ghost_type);
			norm_max_equivalent_stress = 0;
			findMaxNormalizedEquivalentStress(el_type, ghost_type);

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			template<UInt spatial_dimension>
			UInt MaterialDamageIterative<spatial_dimension>::updateDamage() {
			UInt nb_damaged_elements = 0;
			AKANTU_DEBUG_ASSERT(prescribed_dam > 0.,
			"Your prescribed damage must be greater than zero");

			if (norm_max_equivalent_stress >= 1.) {

			AKANTU_DEBUG_IN();

			/// update the damage only on non-ghosts elements! Doesn't make sense to update on ghost.
			GhostType ghost_type = _not_ghost;;

			Mesh::type_iterator it = this->model.getFEEngine().getMesh().firstType(spatial_dimension, ghost_type);
			Mesh::type_iterator last_type = this->model.getFEEngine().getMesh().lastType(spatial_dimension, ghost_type);

			for(; it != last_type; ++it) {
			ElementType el_type = *it;

			const Array<Real> & e_stress = equivalent_stress(el_type);
			Array<Real>::const_iterator<Real> equivalent_stress_it = e_stress.begin();
			Array<Real>::const_iterator<Real> equivalent_stress_end = e_stress.end();
			Array<Real> & dam = this->damage(el_type);
			Array<Real>::iterator<Real> dam_it = dam.begin();
			Array<UInt>::scalar_iterator reduction_it = this->reduction_step(el_type, ghost_type).begin();

			for (; equivalent_stress_it != equivalent_stress_end; ++equivalent_stress_it, ++dam_it,++reduction_it ) {

			/// check if damage occurs
			if (equivalent_stress_it >= (1-dam_tolerance)norm_max_equivalent_stress) {
			/// check if this element can still be damaged
			if (*reduction_it == this->max_reductions)
			continue;
			*reduction_it += 1;
			if (*reduction_it == this->max_reductions) {
			*dam_it = max_damage;
			}
			else {
			*dam_it += prescribed_dam;
			}
			nb_damaged_elements += 1;
			}
			}
			}
			}

			const SolidMechanicsModelRVE * rve_model = dynamic_cast<const SolidMechanicsModelRVE *>(this->model);
			if (rve_model == NULL) {
			StaticCommunicator & comm = akantu::StaticCommunicator::getStaticCommunicator();
			comm.allReduce(&nb_damaged_elements, 1, _so_sum);
			}
			AKANTU_DEBUG_OUT();
			return nb_damaged_elements;
			}
			/* -------------------------------------------------------------------------- */
			template<UInt spatial_dimension>
			void MaterialDamageIterative<spatial_dimension>::updateEnergiesAfterDamage(ElementType el_type, GhostType ghost_type) {
			MaterialDamage<spatial_dimension>::updateEnergies(el_type, ghost_type);
			}

			/* -------------------------------------------------------------------------- */

			INSTANTIATE_MATERIAL(MaterialDamageIterative);


			} // namespace akantu

rAKA/extra_packages/extra-materials/src/material_damage/material_damage_iterative.cca6e5a34073d4releases/10.1007/s40571…

material_damage_iterative.ccView Options

rAKA/extra_packages/extra-materials/src/material_damage/material_damage_iterative.cc
a6e5a34073d4releases/10.1007/s40571…

material_damage_iterative.cc
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