mpi2

material_linear_elastic1.hh
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			/**
			* @file material_linear_elastic1.hh
			*
			* @author Till Junge <till.junge@epfl.ch>
			*
			* @date 13 Nov 2017
			*
			* @brief Implementation for linear elastic reference material like in de Geus
			* 2017. This follows the simplest and likely not most efficient
			* implementation (with exception of the Python law)
			*
			* Copyright © 2017 Till Junge
			*
			* µSpectre is free software; you can redistribute it and/or
			* modify it under the terms of the GNU General Public License as
			* published by the Free Software Foundation, either version 3, or (at
			* your option) any later version.
			*
			* µSpectre 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
			* General Public License for more details.
			*
			* You should have received a copy of the GNU General Public License
			* along with GNU Emacs; see the file COPYING. If not, write to the
			* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
			* Boston, MA 02111-1307, USA.
			*/


			#ifndef MATERIAL_LINEAR_ELASTIC1_H
			#define MATERIAL_LINEAR_ELASTIC1_H

			#include "common/common.hh"
			#include "materials/material_muSpectre_base.hh"
			#include "materials/materials_toolbox.hh"

			namespace muSpectre {
			template<Dim_t DimS, Dim_t DimM>
			class MaterialLinearElastic1;

			/**
			* traits for objective linear elasticity
			*/
			template <Dim_t DimS, Dim_t DimM>
			struct MaterialMuSpectre_traits<MaterialLinearElastic1<DimS, DimM>> {
			using Parent = MaterialMuSpectre_traits<void>;//!< base for elasticity

			//! global field collection
			using GFieldCollection_t = typename
			MaterialBase<DimS, DimM>::GFieldCollection_t;

			//! expected map type for strain fields
			using StrainMap_t = MatrixFieldMap<GFieldCollection_t, Real, DimM, DimM, true>;
			//! expected map type for stress fields
			using StressMap_t = MatrixFieldMap<GFieldCollection_t, Real, DimM, DimM>;
			//! expected map type for tangent stiffness fields
			using TangentMap_t = T4MatrixFieldMap<GFieldCollection_t, Real, DimM>;

			//! declare what type of strain measure your law takes as input
			constexpr static auto strain_measure{StrainMeasure::GreenLagrange};
			//! declare what type of stress measure your law yields as output
			constexpr static auto stress_measure{StressMeasure::PK2};

			//! elasticity without internal variables
			using InternalVariables = std::tuple<>;
			};

			//! DimS spatial dimension (dimension of problem
			//! DimM material_dimension (dimension of constitutive law)
			/**
			* implements objective linear elasticity
			*/
			template<Dim_t DimS, Dim_t DimM>
			class MaterialLinearElastic1:
			public MaterialMuSpectre<MaterialLinearElastic1<DimS, DimM>, DimS, DimM>
			{
			public:
			//! base class
			using Parent = MaterialMuSpectre<MaterialLinearElastic1, DimS, DimM>;
			/**
			* type used to determine whether the
			* `muSpectre::MaterialMuSpectre::iterable_proxy` evaluate only
			* stresses or also tangent stiffnesses
			*/
			using NeedTangent = typename Parent::NeedTangent;
			//! global field collection

			using Stiffness_t = Eigen::TensorFixedSize
			<Real, Eigen::Sizes<DimM, DimM, DimM, DimM>>;

			//! traits of this material
			using traits = MaterialMuSpectre_traits<MaterialLinearElastic1>;

			//! this law does not have any internal variables
			using InternalVariables = typename traits::InternalVariables;

			//! Hooke's law implementation
			using Hooke = typename
			MatTB::Hooke<DimM,
			typename traits::StrainMap_t::reference,
			typename traits::TangentMap_t::reference>;

			//! Default constructor
			MaterialLinearElastic1() = delete;

			//! Copy constructor
			MaterialLinearElastic1(const MaterialLinearElastic1 &other) = delete;

			//! Construct by name, Young's modulus and Poisson's ratio
			MaterialLinearElastic1(std::string name, Real young, Real poisson);


			//! Move constructor
			MaterialLinearElastic1(MaterialLinearElastic1 &&other) = delete;

			//! Destructor
			virtual ~MaterialLinearElastic1() = default;

			//! Copy assignment operator
			MaterialLinearElastic1& operator=(const MaterialLinearElastic1 &other) = delete;

			//! Move assignment operator
			MaterialLinearElastic1& operator=(MaterialLinearElastic1 &&other) = delete;

			/**
			* evaluates second Piola-Kirchhoff stress given the Green-Lagrange
			* strain (or Cauchy stress if called with a small strain tensor)
			*/
			template <class s_t>
			inline decltype(auto) evaluate_stress(s_t && E);

			/**
			* evaluates both second Piola-Kirchhoff stress and stiffness given
			* the Green-Lagrange strain (or Cauchy stress and stiffness if
			* called with a small strain tensor)
			*/
			template <class s_t>
			inline decltype(auto) evaluate_stress_tangent(s_t && E);

			/**
			* return the empty internals tuple
			*/
			InternalVariables & get_internals() {
			return this->internal_variables;};

			protected:
			const Real young; //!< Young's modulus
			const Real poisson;//!< Poisson's ratio
			const Real lambda; //!< first Lamé constant
			const Real mu; //!< second Lamé constant (shear modulus)
			const Stiffness_t C; //!< stiffness tensor
			//! empty tuple
			InternalVariables internal_variables{};
			private:
			};

			/* ---------------------------------------------------------------------- */
			template <Dim_t DimS, Dim_t DimM>
			template <class s_t>
			decltype(auto)
			MaterialLinearElastic1<DimS, DimM>::evaluate_stress(s_t && E) {
			return Hooke::evaluate_stress(this->lambda, this->mu,
			std::move(E));
			}

			/* ---------------------------------------------------------------------- */
			template <Dim_t DimS, Dim_t DimM>
			template <class s_t>
			decltype(auto)
			MaterialLinearElastic1<DimS, DimM>::evaluate_stress_tangent(s_t && E) {
			using Tangent_t = typename traits::TangentMap_t::reference;


			// using mat = Eigen::Matrix<Real, DimM, DimM>;
			// mat ecopy{E};
			// std::cout << "E" << std::endl << ecopy << std::endl;
			// std::cout << "P1" << std::endl << mat{
			// std::get<0>(Hooke::evaluate_stress(this->lambda, this->mu,
			// Tangent_t(const_cast<double*>(this->C.data())),
			// std::move(E)))} << std::endl;
			return Hooke::evaluate_stress(this->lambda, this->mu,
			Tangent_t(const_cast<double*>(this->C.data())),
			std::move(E));
			}

			} // muSpectre

			#endif /* MATERIAL_LINEAR_ELASTIC1_H */

muSpectre/src/materials/material_linear_elastic1.hhb1cf98a8193cfeat/mpi2

material_linear_elastic1.hhView Options

muSpectre/src/materials/material_linear_elastic1.hh
b1cf98a8193cfeat/mpi2

material_linear_elastic1.hh
View Options