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rAKA/src/model/solid_mechanics/materials/material_finite_deformation/material_neohookean.hh
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material_neohookean.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.hh"
#include "plane_stress_toolbox.hh"
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_MATERIAL_NEOHOOKEAN_HH_
#define AKANTU_MATERIAL_NEOHOOKEAN_HH_
namespace akantu {
/**
* Material elastic isotropic
*
* parameters in the material files :
* - rho : density (default: 0)
* - 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 MaterialNeohookean : public PlaneStressToolbox<dim> {
using Parent = PlaneStressToolbox<dim>;
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
MaterialNeohookean(SolidMechanicsModel & model, const ID & id = "");
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
/// initialize the material computed parameter
void initMaterial() override;
/// constitutive law for all element of a type
void computeStress(ElementType el_type,
GhostType ghost_type = _not_ghost) override;
/// Computation of the cauchy stress for plane strain materials
void
computeCauchyStressPlaneStress(ElementType el_type,
GhostType ghost_type = _not_ghost) override;
/// Non linear computation of the third direction strain in 2D plane stress
/// case
void computeThirdAxisDeformation(ElementType el_type,
GhostType ghost_type = _not_ghost) override;
/// compute the elastic potential energy
void computePotentialEnergy(ElementType el_type) 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 p-wave speed in the material
[[nodiscard]] Real getPushWaveSpeed(const Element & element) const override;
/// compute the s-wave speed in the material
[[nodiscard]] Real getShearWaveSpeed(const Element & element) const override;
MatrixType getTangentType() override { return _symmetric; }
protected:
/// constitutive law for a given quadrature point
inline void computePiolaKirchhoffOnQuad(const Matrix<Real> & E,
Matrix<Real> & S);
/// constitutive law for a given quadrature point (first piola)
inline void computeFirstPiolaKirchhoffOnQuad(const Matrix<Real> & grad_u,
const Matrix<Real> & S,
Matrix<Real> & P);
/// constitutive law for a given quadrature point
inline void computeDeltaStressOnQuad(const Matrix<Real> & grad_u,
const Matrix<Real> & grad_delta_u,
Matrix<Real> & delta_S);
/// constitutive law for a given quadrature point
template <class Args> inline void computeStressOnQuad(Args && args);
/// constitutive law for a given quadrature point
template <class Args>
inline void computeThirdAxisDeformationOnQuad(Args && args);
/// constitutive law for a given quadrature point
// inline void updateStressOnQuad(const Matrix<Real> & sigma,
// Matrix<Real> & cauchy_sigma);
/// compute the potential energy for a quadrature point
template <class Args>
inline void computePotentialEnergyOnQuad(Args && args, Real & epot);
/// compute the tangent stiffness matrix for an element
template <class Args> void computeTangentModuliOnQuad(Args && args);
/// recompute the lame coefficient if E or nu changes
void updateInternalParameters() override;
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected:
/// the young modulus
Real E{0.};
/// Poisson coefficient
Real nu{0.};
/// First Lamé coefficient
Real lambda{0.};
/// Second Lamé coefficient (shear modulus)
Real mu{0.};
/// Bulk modulus
Real kpa{0.};
};
} // namespace akantu
/* -------------------------------------------------------------------------- */
/* inline functions */
/* -------------------------------------------------------------------------- */
#include "material_neohookean_inline_impl.hh"
#endif /* AKANTU_MATERIAL_NEOHOOKEAN_HH_ */
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