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rAKA/src/model/solid_mechanics/materials/material_plastic/material_viscoplasticity.hh
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material_viscoplasticity.hh
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/**
* @file material_plasticityinc.hh
*
* @author Ramin Aghababaei <ramin.aghababaei@epfl.ch>
*
* @date Tue Jul 09 18:15:37 20130
*
* @brief Specialization of the material class for isotropic finite deformation linear hardening plasticityviscoplastic (small deformation)
*
* @section LICENSE
*
* Copyright (©) 2010-2011 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 "aka_common.hh"
#include "material_elastic.hh"
#include "aka_voigthelper.hh"
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_MATERIAL_VISCOPLASTICITY_HH__
#define __AKANTU_MATERIAL_VISCOPLASTICITY_HH__
__BEGIN_AKANTU__
/**
* Material plastic isotropic
*
* parameters in the material files :
* - h : Hardening parameter (default: 0)
* - sigmay : Yield stress
* - rate : Rate sensitivity
* - edot0 : Reference strain rate
*
* - ts: Time step
*/
template <UInt spatial_dimension>
class MaterialViscoPlasticity : public MaterialElastic<spatial_dimension> {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
MaterialViscoPlasticity(SolidMechanicsModel & model, const ID & id = "");
virtual ~MaterialViscoPlasticity() {};
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
/// constitutive law for all element of a type
virtual void computeStress(ElementType el_type, GhostType ghost_type = _not_ghost);
/// compute the tangent stiffness matrix for an element type
void computeTangentModuli(const ElementType & el_type,
Array<Real> & tangent_matrix,
GhostType ghost_type = _not_ghost);
protected:
inline void computeStressOnQuad(Matrix<Real> & grad_u,
Matrix<Real> & grad_delta_u,
Matrix<Real> & sigma,
Matrix<Real> & inelas_strain,
Real & iso_hardening);
void computeTangentModuliOnQuad(Matrix<Real> & tangent,
Matrix<Real> & grad_delta_u,
Matrix<Real> & sigma_tensor,
Matrix<Real> & previous_sigma_tensor,
Real & iso_hardening);
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
private:
/// Yield stresss
Real sigmay;
/// Hardening modulus
Real h;
/// Rate sensitivity component (rate)
Real rate;
/// Reference strain rate (edot0)
Real edot0;
/// Isotropic hardening (r)
InternalField<Real> iso_hardening;
/// Time step (ts)
Real ts;
};
/* -------------------------------------------------------------------------- */
/* inline functions */
/* -------------------------------------------------------------------------- */
#include "material_viscoplasticity_inline_impl.cc"
__END_AKANTU__
#endif /* __AKANTU_MATERIAL_VISCOPLASTICITY_HH__ */
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