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material_elastic.hh
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/**
* Copyright (©) 2010-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This file is part of Akantu
*
* 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/>.
*/
/* -------------------------------------------------------------------------- */
#include "material_thermal.hh"
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_MATERIAL_ELASTIC_HH_
#define AKANTU_MATERIAL_ELASTIC_HH_
namespace akantu {
/**
* Material elastic isotropic
*
* parameters in the material files :
* - E : Young's modulus (default: 0)
* - nu : Poisson's ratio (default: 1/2)
* - Plane_Stress : if 0: plane strain, else: plane stress (default: 0)
*/
template <Int dim> class MaterialElastic : public MaterialThermal<dim> {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
private:
using Parent = MaterialThermal<dim>;
public:
MaterialElastic(SolidMechanicsModel & model, const ID & id = "",
const ID & fe_engine_id = "");
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
void initMaterial() override;
/// constitutive law for all element of a type
void computeStress(ElementType el_type,
GhostType ghost_type = _not_ghost) override;
/// compute the tangent stiffness matrix for an element type
void computeTangentModuli(ElementType el_type, Array<Real> & tangent_matrix,
GhostType ghost_type = _not_ghost) override;
/// compute the elastic potential energy
void computePotentialEnergy(ElementType el_type) override;
[[deprecated("Use the interface with an Element")]] void
computePotentialEnergyByElement(ElementType type, Int index,
Vector<Real> & epot_on_quad_points) override {
computePotentialEnergyByElement({type, index, _not_ghost},
epot_on_quad_points);
}
void
computePotentialEnergyByElement(const Element & element,
Vector<Real> & epot_on_quad_points) override;
/// compute the p-wave speed in the material
[[nodiscard]] auto getPushWaveSpeed(const Element & element) const
-> Real override;
/// compute the s-wave speed in the material
[[nodiscard]] auto getShearWaveSpeed(const Element & element) const
-> Real override;
protected:
/// constitutive law for a given quadrature point
template <typename Args> inline void computeStressOnQuad(Args && args) const;
/// compute the tangent stiffness matrix for an element
template <typename Args>
inline void computeTangentModuliOnQuad(Args && args) const;
/// recompute the lame coefficient if E or nu changes
void updateInternalParameters() override;
template <class Args>
static inline void computePotentialEnergyOnQuad(Args && args, Real & epot);
auto hasStiffnessMatrixChanged() -> bool override {
return (not was_stiffness_assembled);
}
auto getTangentType() -> MatrixType override { return _symmetric; }
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/// get first Lame constant
AKANTU_GET_MACRO(Lambda, lambda, Real);
/// get second Lame constant
AKANTU_GET_MACRO(Mu, mu, Real);
/// get bulk modulus
AKANTU_GET_MACRO(Kappa, kpa, Real);
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected:
/// First Lamé coefficient
Real lambda{0.};
/// Second Lamé coefficient (shear modulus)
Real mu{0.};
/// Bulk modulus
Real kpa{0.};
/// defines if the stiffness was computed
bool was_stiffness_assembled{false};
};
} // namespace akantu
#include "material_elastic_inline_impl.hh"
#endif /* AKANTU_MATERIAL_ELASTIC_HH_ */

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