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system_base.hh
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/**
* file system_base.hh
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 01 Nov 2017
*
* @brief Base class representing a unit cell system with single
* projection operator
*
* @section LICENCE
*
* 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 SYSTEM_BASE_H
#define SYSTEM_BASE_H
#include "common/common.hh"
#include "common/ccoord_operations.hh"
#include "common/field.hh"
#include "common/utilities.hh"
#include "materials/material_base.hh"
#include "fft/projection_base.hh"
#include <vector>
#include <memory>
#include <tuple>
#include <functional>
namespace muSpectre {
//! DimS spatial dimension (dimension of problem
//! DimM material_dimension (dimension of constitutive law)
template<Dim_t DimS, Dim_t DimM>
class SystemBase
{
public:
using Ccoord = Ccoord_t<DimS>;
using Rcoord = Rcoord_t<DimS>;
using FieldCollection_t = FieldCollection<DimS, DimM>;
using Material_t = MaterialBase<DimS, DimM>;
using Material_ptr = std::unique_ptr<Material_t>;
using Projection_ptr = std::unique_ptr<ProjectionBase<DimS, DimM>>;
using StrainField_t =
TensorField<FieldCollection_t, Real, secondOrder, DimM>;
using StressField_t =
TensorField<FieldCollection_t, Real, secondOrder, DimM>;
using TangentField_t =
TensorField<FieldCollection_t, Real, fourthOrder, DimM>;
using FullResponse_t =
std::tuple<const StressField_t&, const TangentField_t&>;
using iterator = typename CcoordOps::Pixels<DimS>::iterator;
//! Default constructor
SystemBase() = delete;
//! constructor using sizes and resolution
SystemBase(Projection_ptr projection,
Formulation form=Formulation::finite_strain);
//! Copy constructor
SystemBase(const SystemBase &other) = delete;
//! Move constructor
SystemBase(SystemBase &&other) noexcept = default;
//! Destructor
virtual ~SystemBase() noexcept = default;
//! Copy assignment operator
SystemBase& operator=(const SystemBase &other) = delete;
//! Move assignment operator
SystemBase& operator=(SystemBase &&other) = default;
/**
* Materials can only be moved. This is to assure exclusive
* ownership of any material by this system
*/
void add_material(Material_ptr mat);
/**
* evaluates all materials
*/
FullResponse_t evaluate_stress_tangent(StrainField_t & F);
/**
* evaluate directional stiffness (i.e. G:K:δF)
*/
StressField_t & directional_stiffness(const TangentField_t & K,
const StrainField_t & delF,
StressField_t & delP);
/**
* Convenience function circumventing the neeed to use the
* underlying projection
*/
StressField_t & project(StressField_t & field);
StrainField_t & get_strain();
const StressField_t & get_stress() const;
/**
* general initialisation; initialises the projection and
* fft_engine (i.e. infrastructure) but not the materials. These
* need to be initialised separately
*/
void initialise(FFT_PlanFlags flags = FFT_PlanFlags::estimate);
/**
* initialise materials (including resetting any history variables)
*/
void initialise_materials(bool stiffness=false);
iterator begin();
iterator end();
size_t size() const {return pixels.size();}
const Ccoord & get_resolutions() const {return this->resolutions;}
const Rcoord & get_lengths() const {return this->lengths;}
protected:
//! make sure that every pixel is assigned to one and only one material
void check_material_coverage();
const Ccoord & resolutions;
CcoordOps::Pixels<DimS> pixels;
const Rcoord & lengths;
FieldCollection_t fields;
StrainField_t & F;
StressField_t & P;
//! Tangent field might not even be required; so this is an
//! optional ref_wrapper instead of a ref
optional<std::reference_wrapper<TangentField_t>> K{};
std::vector<Material_ptr> materials{};
Projection_ptr projection;
Formulation form;
bool is_initialised{false};
private:
};
} // muSpectre
#endif /* SYSTEM_BASE_H */

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