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material_plastic.hh
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/**
* @file material_plastic.hh
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
* @author Daniel Pino Muñoz <daniel.pinomunoz@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Fri Jun 18 2010
* @date last modification: Thu Dec 07 2017
*
* @brief Common interface for plastic materials
*
*
* Copyright (©) 2010-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* 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_elastic.hh"
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_MATERIAL_PLASTIC_HH_
#define AKANTU_MATERIAL_PLASTIC_HH_
namespace akantu {
/**
* Parent class for the plastic constitutive laws
* parameters in the material files :
* - h : Hardening parameter (default: 0)
* - sigmay : Yield stress
*/
template <UInt dim> class MaterialPlastic : public MaterialElastic<dim> {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
MaterialPlastic(SolidMechanicsModel & model, const ID & id = "");
MaterialPlastic(SolidMechanicsModel & model, UInt a_dim, const Mesh & mesh,
FEEngine & fe_engine, const ID & id = "");
protected:
void initialize();
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
/**
* @brief Return potential or plastic energy
*
* Plastic dissipated energy is integrated over time.
*/
Real getEnergy(const std::string & type) override;
/// Update the plastic energy for the current timestep
void updateEnergies(ElementType el_type) override;
/// Compute the true potential energy (w/ elastic strain)
void computePotentialEnergy(ElementType el_type) override;
protected:
/// compute the stress and inelastic strain for the quadrature point
inline void computeStressAndInelasticStrainOnQuad(
const Matrix<Real> & grad_u, const Matrix<Real> & previous_grad_u,
Matrix<Real> & sigma, const Matrix<Real> & previous_sigma,
Matrix<Real> & inelastic_strain,
const Matrix<Real> & previous_inelastic_strain,
const Matrix<Real> & delta_inelastic_strain) const;
inline void computeStressAndInelasticStrainOnQuad(
const Matrix<Real> & delta_grad_u, Matrix<Real> & sigma,
const Matrix<Real> & previous_sigma, Matrix<Real> & inelastic_strain,
const Matrix<Real> & previous_inelastic_strain,
const Matrix<Real> & delta_inelastic_strain) const;
/// Get the integrated plastic energy for the time step
Real getPlasticEnergy();
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected:
/// Yield stresss
Real sigma_y;
/// hardening modulus
Real h;
/// isotropic hardening, r
InternalField<Real> iso_hardening;
/// inelastic strain arrays ordered by element types (inelastic deformation)
InternalField<Real> inelastic_strain;
/// Plastic energy
InternalField<Real> plastic_energy;
/// @todo : add a coefficient beta that will multiply the plastic energy
/// increment
/// to compute the energy converted to heat
/// Plastic energy increment
InternalField<Real> d_plastic_energy;
};
/* -------------------------------------------------------------------------- */
/* inline functions */
/* -------------------------------------------------------------------------- */
} // namespace akantu
#include "material_plastic_inline_impl.hh"
#endif /* AKANTU_MATERIAL_PLASTIC_HH_ */

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