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muSpectre/src/materials/material_muSpectre_base.hh
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/**
* file material_muSpectre_base.hh
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 25 Oct 2017
*
* @brief Base class for materials written for µSpectre specifically. These
* can take full advantage of the configuration-change utilities of
* µSpectre. The user can inherit from them to define new constitutive
* laws and is merely required to provide the methods for computing the
* second Piola-Kirchhoff stress and Tangent. This class uses the
* "curiously recurring template parameter" to avoid virtual calls.
*
* @section LICENCE
*
* Copyright (C) 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.
*/
#include <tuple>
#include <type_traits>
#include <iterator>
#include "stdexcept"
#include "materials/material_base.hh"
#include "materials/materials_toolbox.hh"
#include "common/field_collection.hh"
#include "common/field.hh"
#ifndef MATERIAL_MUSPECTRE_BASE_H
#define MATERIAL_MUSPECTRE_BASE_H
namespace muSpectre {
//! 'Material' is a CRTP
template<class Material, Dim_t DimS, Dim_t DimM>
class MaterialMuSpectre: public MaterialBase<DimS, DimM>
{
public:
enum class NeedTangent {yes, no};
using Parent = MaterialBase<DimS, DimM>;
using MFieldCollection_t = typename Parent::MFieldCollection_t;
using StressField_t = typename Parent::StressField_t;
using StrainField_t = typename Parent::StrainField_t;
using TangentField_t = typename Parent::TangentField_t;
//! Default constructor
MaterialMuSpectre() = delete;
//! Construct by name
MaterialMuSpectre(std::string name);
//! Copy constructor
MaterialMuSpectre(const MaterialMuSpectre &other) = delete;
//! Move constructor
MaterialMuSpectre(MaterialMuSpectre &&other) noexcept = delete;
//! Destructor
virtual ~MaterialMuSpectre() noexcept = default;
//! Copy assignment operator
MaterialMuSpectre& operator=(const MaterialMuSpectre &other) = delete;
//! Move assignment operator
MaterialMuSpectre& operator=(MaterialMuSpectre &&other) noexcept = delete;
//! computes stress
virtual void compute_stresses(const StrainField_t & F,
StressField_t & P,
Formulation form) override final;
//! computes stress and tangent modulus
virtual void compute_stresses_tangent(const StrainField_t & F,
StressField_t & P,
TangentField_t & K,
Formulation form) override final;
protected:
//! computes stress with the formulation available at compile time
template <Formulation Form>
inline void compute_stresses_worker(const StrainField_t & F,
StressField_t & P);
//! computes stress with the formulation available at compile time
template <Formulation Form>
inline void compute_stresses_worker(const StrainField_t & F,
StressField_t & P,
TangentField_t & K);
//! this iterable class is a default for simple laws that just take a strain
//! the iterable is just a templated wrapper to provide a range to iterate over
//! that does or does not include tangent moduli
template<NeedTangent need_tgt = NeedTangent::no>
class iterable_proxy;
private:
};
/* ---------------------------------------------------------------------- */
template <class Material, Dim_t DimS, Dim_t DimM>
void MaterialMuSpectre<Material, DimS, DimM>::
compute_stresses(const StrainField_t &F, StressField_t &P,
muSpectre::Formulation form) {
switch (form) {
case Formulation::finite_strain: {
this->template compute_stresses_worker<Formulation::finite_strain>(F, P);
break;
}
case Formulation::small_strain: {
this->template compute_stresses_worker<Formulation::small_strain>(F, P);
break;
}
default:
throw std::runtime_error("Unknown formulation");
break;
}
}
/* ---------------------------------------------------------------------- */
template <class Material, Dim_t DimS, Dim_t DimM>
void MaterialMuSpectre<Material, DimS, DimM>::
compute_stresses_tangent(const StrainField_t & F, StressField_t & P,
TangentField_t & K,
muSpectre::Formulation form) {
switch (form) {
case Formulation::finite_strain: {
this->template compute_stresses_worker<Formulation::finite_strain>(F, P, K);
break;
}
case Formulation::small_strain: {
this->template compute_stresses_worker<Formulation::small_strain>(F, P, K);
break;
}
default:
throw std::runtime_error("Unknown formulation");
break;
}
}
/* ---------------------------------------------------------------------- */
template <class Material, Dim_t DimS, Dim_t DimM>
template <Formulation Form>
void MaterialMuSpectre<Material, DimS, DimM>::
compute_stresses_worker(const StrainField_t & F,
StressField_t & P,
TangentField_t & K){
//! in small strain problems, we always want Cauchy stress as a function
//! of the infinitesimal strain tensor
using IterableSmallStrain_t = iterable_proxy<NeedTangent::yes>;
using IterableFiniteStrain_t = iterable_proxy<NeedTangent::yes>;
using iterable =
std::conditional_t
<(Form==Formulation::small_strain),
IterableSmallStrain_t,
IterableFiniteStrain_t>;
constexpr auto stored_strain_m = get_stored_strain_type(Form);
constexpr auto expected_strain_m = get_formulation_strain_type(Form, Material::strain_measure);
/* This lambda is executed for every integration point.
F contains the transformation gradient for finite strain calculations and
the infinitesimal strain tensor in small strain problems
The internal_variables tuple contains whatever internal variables
Material declared (e.g., eigenstrain, strain rate, etc.)
*/
auto constitutive_law = [this](auto && F, auto && ... internal_variables) {
auto && strain = MatTB::convert_strain<stored_strain_m, expected_strain_m>(F);
// return value contains a tuple of rvalue_refs to both stress and tangent moduli
auto && stress_tgt = static_cast<Material&>(*this).evaluate_stress_tangent(std::move(strain), internal_variables...);
if (Form == Formulation::small_strain) {
return std::move(stress_tgt);
} else {
auto && stress = std::get<0>(stress_tgt);
auto && tangent = std::get<1>(stress_tgt);
return MatTB::PK1_stress<Material::stress_measure, Material::strain_measure>
(F, stress, tangent);
}
};
iterable it{*this};
for (auto && tuples: it) {
// the iterator yields a pair of tuples. this first tuple contains
// references to stress and stiffness in the global arrays, the second
// contains references to the deformation gradient and internal variables
// (some of them are const).
auto && stress_tgt = std::get<0>(tuples);
auto && inputs = std::get<1>(tuples);
stress_tgt = std::apply(constitutive_law, std::move(inputs));
}
}
/* ---------------------------------------------------------------------- */
//! this iterator class is a default for simple laws that just take a strain
template<class Material, Dim_t DimS, Dim_t DimM>
template<typename MaterialMuSpectre<Material, DimS, DimM>::NeedTangent NeedTgt>
class MaterialMuSpectre<Material, DimS, DimM>::iterable_proxy {
public:
//! Default constructor
iterable_proxy() = delete;
/** Iterator uses the material's internal variables field
collection to iterate selectively over the global fields
(such as the transformation gradient F and first
Piola-Kirchhoff stress P.
**/
iterable_proxy(const MaterialMuSpectre & mat);
using Strain_t = typename Material::Strain_t;
using Stress_t = typename Material::Stress_t;
using Tangent_t = typename Material::Tangent_t;
//! Copy constructor
iterable_proxy(const iterable_proxy &other) = default;
//! Move constructor
iterable_proxy(iterable_proxy &&other) noexcept = default;
//! Destructor
virtual ~iterable_proxy() noexcept = default;
//! Copy assignment operator
iterable_proxy& operator=(const iterable_proxy &other) = default;
//! Move assignment operator
iterable_proxy& operator=(iterable_proxy &&other) noexcept = default;
class iterator
{
public:
using value_type =
std::conditional_t
<(NeedTgt == NeedTangent::yes),
std::tuple<std::tuple<Stress_t, Tangent_t>, std::tuple<Strain_t>>,
std::tuple<std::tuple<Stress_t>, std::tuple<Strain_t>>>;
using iterator_category = std::forward_iterator_tag;
//! Default constructor
iterator() = delete;
/** Iterator uses the material's internal variables field
collection to iterate selectively over the global fields
(such as the transformation gradient F and first
Piola-Kirchhoff stress P.
**/
iterator(const MaterialMuSpectre & mat, bool begin = true);
//! Copy constructor
iterator(const iterator &other) = default;
//! Move constructor
iterator(iterator &&other) noexcept = default;
//! Destructor
virtual ~iterator() noexcept = default;
//! Copy assignment operator
iterator& operator=(const iterator &other) = default;
//! Move assignment operator
iterator& operator=(iterator &&other) noexcept = default;
//! pre-increment
inline iterator & operator++();
//! dereference
inline value_type operator*();
//! inequality
inline bool operator!=(const iterator & other) const;
protected:
const MaterialMuSpectre & material;
size_t index;
private:
};
iterator begin() {return iterator(*this);}
iterator end() {return iterator(*this, false);}
protected:
const MaterialMuSpectre & material;
private:
};
/* ---------------------------------------------------------------------- */
template<class Material, Dim_t DimS, Dim_t DimM>
template<typename MaterialMuSpectre<Material, DimS, DimM>::NeedTangent Tangent>
MaterialMuSpectre<Material, DimS, DimM>::iterable_proxy<Tangent>::
iterable_proxy(const MaterialMuSpectre<Material, DimS, DimM> & mat)
: material{mat}
{}
/* ---------------------------------------------------------------------- */
template<class Material, Dim_t DimS, Dim_t DimM>
template<typename MaterialMuSpectre<Material, DimS, DimM>::NeedTangent Tangent>
MaterialMuSpectre<Material, DimS, DimM>::iterable_proxy<Tangent>::
iterator::iterator(const MaterialMuSpectre<Material, DimS, DimM> & mat, bool begin)
: material{mat}, index{begin ? 0:mat.internal_fields.size()}
{}
/* ---------------------------------------------------------------------- */
//! pre-increment
template<class Material, Dim_t DimS, Dim_t DimM>
template<typename MaterialMuSpectre<Material, DimS, DimM>::NeedTangent Tangent>
typename MaterialMuSpectre<Material, DimS, DimM>::
template iterable_proxy<Tangent>::iterator &
MaterialMuSpectre<Material, DimS, DimM>::
template iterable_proxy<Tangent>::iterator::
operator++() {
++this->index;
return *this;
}
/* ---------------------------------------------------------------------- */
//! dereference
template<class Material, Dim_t DimS, Dim_t DimM>
template<typename MaterialMuSpectre<Material, DimS, DimM>::NeedTangent Tangent>
typename MaterialMuSpectre<Material, DimS, DimM>::
template iterable_proxy<Tangent>::iterator::value_type
MaterialMuSpectre<Material, DimS, DimM>::
template iterable_proxy<Tangent>::iterator::
operator*() {
static_assert(Tangent, "Template specialisation failed");
return std::make_tuple
(this->material.internal_fields);
}
} // muSpectre
#endif /* MATERIAL_MUSPECTRE_BASE_H */
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