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material_reinforcement.hh
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			/**
			* @file material_reinforcement.hh
			*
			* @author Lucas Frérot <lucas.frerot@epfl.ch>
			*
			* @date creation: Thu Mar 12 2015
			* @date last modification: Thu Mar 12 2015
			*
			* @brief Reinforcement material
			*
			* @section LICENSE
			*
			* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
			* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
			*
			* Akantu 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 3 of the License, or (at your option) any
			* later version.
			*
			* Akantu 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 Akantu. If not, see <http://www.gnu.org/licenses/>.
			*
			*/

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

			#ifndef __AKANTU_MATERIAL_REINFORCEMENT_HH__
			#define __AKANTU_MATERIAL_REINFORCEMENT_HH__

			#include "aka_common.hh"

			#include "material.hh"
			#include "embedded_interface_model.hh"
			#include "embedded_internal_field.hh"

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

			__BEGIN_AKANTU__

			/**
			* @brief Material used to represent embedded reinforcements
			*
			* This class is used for computing the reinforcement stiffness matrix
			* along with the reinforcement residual. Room is made for constitutive law,
			* but actual use of contitutive laws is made in MaterialReinforcementTemplate.
			*/
			template<UInt dim>
			class MaterialReinforcement : virtual public Material {

			/* ------------------------------------------------------------------------ */
			/* Constructors/Destructors */
			/* ------------------------------------------------------------------------ */
			public:
			/// Constructor
			MaterialReinforcement(SolidMechanicsModel & model, const ID & id = "");

			/// Destructor
			virtual ~MaterialReinforcement();

			/* ------------------------------------------------------------------------ */
			/* Methods */
			/* ------------------------------------------------------------------------ */
			public:
			/// Init the material
			virtual void initMaterial();

			/// Init the background shape derivatives
			void initBackgroundShapeDerivatives();

			/// Init the cosine matrices
			void initDirectingCosines();

			/// Assemble stiffness matrix
			virtual void assembleStiffnessMatrix(GhostType ghost_type);

			/// Update the residual
			virtual void updateResidual(GhostType ghost_type = _not_ghost);

			/// Assembled the residual
			virtual void assembleResidual(GhostType ghost_type);

			/// Compute all the stresses !
			virtual void computeAllStresses(GhostType ghost_type);

			/// Compute the stiffness parameter for elements of a type
			virtual void computeTangentModuli(const ElementType & type,
			Array<Real> & tangent,
			GhostType ghost_type) = 0;

			virtual Real getEnergy(std::string id);

			ElementTypeMap<UInt> getInternalDataPerElem(const ID & field_name,
			const ElementKind & kind,
			const ID & fe_engine_id);

			/// Reimplementation of Material's function to accomodate for interface mesh
			virtual void flattenInternal(const std::string & field_id,
			ElementTypeMapArray<Real> & internal_flat,
			const GhostType ghost_type = _not_ghost,
			ElementKind element_kind = _ek_not_defined);

			/* ------------------------------------------------------------------------ */
			/* Protected methods */
			/* ------------------------------------------------------------------------ */
			protected:
			/// Allocate the background shape derivatives
			void allocBackgroundShapeDerivatives();

			/// Compute the directing cosines matrix for one element type
			void computeDirectingCosines(const ElementType & type, GhostType ghost_type);

			/**
			* @brief Compute the directing cosines matrix on quadrature points.
			*
			* The structure of the directing cosines matrix is :
			* \f{eqnarray*}{
			* C_{1,\cdot} & = & (l^2, m^2, n^2, lm, mn, ln) \\
			* C_{i,j} & = & 0
			* \f}
			*
			* with :
			* \f[
			* (l, m, n) = \frac{1}{\\|\frac{\mathrm{d}\vec{r}(s)}{\mathrm{d}s}\\|} \cdot \frac{\mathrm{d}\vec{r}(s)}{\mathrm{d}s}
			* \f]
			*/
			inline void computeDirectingCosinesOnQuad(const Matrix<Real> & nodes,
			Matrix<Real> & cosines);

			/// Assemble the stiffness matrix for an element type (typically _segment_2)
			void assembleStiffnessMatrix(const ElementType & type, GhostType ghost_type);

			/**
			* @brief Assemble the stiffness matrix for background & interface types
			*
			* Computes the reinforcement stiffness matrix (Gomes & Awruch, 2001)
			* \f[
			* \mathbf{K}_e = \sum_{i=1}^R{A_i\int_{S_i}{\mathbf{B}^T
			* \mathbf{C}_i^T \mathbf{D}_{s, i} \mathbf{C}_i \mathbf{B}\,\mathrm{d}s}}
			* \f]
			*/
			void assembleStiffnessMatrix(const ElementType & interface_type,
			const ElementType & background_type,
			GhostType interface_ghost,
			GhostType background_ghost);

			/// Compute the background shape derivatives for a type
			void computeBackgroundShapeDerivatives(const ElementType & type, GhostType ghost_type);

			/// Filter elements crossed by interface of a type
			void filterInterfaceBackgroundElements(Array<UInt> & filter,
			const ElementType & type,
			const ElementType & interface_type,
			GhostType ghost_type,
			GhostType interface_ghost_type);

			/// Assemble the residual of one type of element (typically _segment_2)
			void assembleResidual(const ElementType & type, GhostType ghost_type);

			/**
			* @brief Assemble the residual for a pair of elements
			*
			* Computes and assemble the residual. Residual in reinforcement is computed as :
			* \f[
			* \vec{r} = A_s \int_S{\mathbf{B}^T\mathbf{C}^T \vec{\sigma_s}\,\mathrm{d}s}
			* \f]
			*/
			void assembleResidual(const ElementType & interface_type,
			const ElementType & background_type,
			GhostType interface_ghost,
			GhostType background_ghost);

			// TODO figure out why voigt size is 4 in 2D
			inline void stressTensorToVoigtVector(const Matrix<Real> & tensor, Vector<Real> & vector);
			inline void strainTensorToVoigtVector(const Matrix<Real> & tensor, Vector<Real> & vector);

			/// Compute gradu on the interface quadrature points
			virtual void computeGradU(const ElementType & type, GhostType ghost_type);

			/* ------------------------------------------------------------------------ */
			/* Class Members */
			/* ------------------------------------------------------------------------ */
			protected:
			/// Embedded model
			EmbeddedInterfaceModel * model;

			/// grad_u
			EmbeddedInternalField<Real> gradu;

			/// stress
			EmbeddedInternalField<Real> stress;

			/// C matrix on quad
			EmbeddedInternalField<Real> directing_cosines;

			/// Prestress on quad
			EmbeddedInternalField<Real> pre_stress;

			/// Cross-sectional area
			Real area;

			/// Background mesh shape derivatives
			ElementTypeMap< ElementTypeMapArray<Real> * > shape_derivatives;

			};

			#include "material_reinforcement_inline_impl.cc"

			__END_AKANTU__

			#endif // __AKANTU_MATERIAL_REINFORCEMENT_HH__

rAKA/src/model/solid_mechanics/materials/material_embedded/material_reinforcement.hhb48b80bac2b8features/issue-template

material_reinforcement.hhView Options

rAKA/src/model/solid_mechanics/materials/material_embedded/material_reinforcement.hh
b48b80bac2b8features/issue-template

material_reinforcement.hh
View Options