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material_viscoplastic.hh
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Tue, May 7, 16:11

material_viscoplastic.hh
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/**
* @file material_viscoplastic.hh
*
* @author Ramin Aghababaei <ramin.aghababaei@epfl.ch>
*
*
* @brief Specialization of the material class for
* MaterialLinearIsotropicHardening to include viscous effects (small
* deformation)
*
* @section LICENSE
*
* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "material_plastic.hh"
#include "aka_voigthelper.hh"
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_MATERIAL_VISCOPLASTIC_HH__
#define __AKANTU_MATERIAL_VISCOPLASTIC_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 MaterialViscoPlastic : public MaterialPlastic<spatial_dimension> {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
MaterialViscoPlastic(SolidMechanicsModel & model, const ID & id = "");
/* ------------------------------------------------------------------------ */
/* 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(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,
Real & iso_hardening) const;
inline void computeTangentModuliOnQuad(Matrix<Real> & tangent,
const Matrix<Real> & grad_u,
const Matrix<Real> & previous_grad_u,
const Matrix<Real> & sigma_tensor,
const Matrix<Real> & previous_sigma_tensor,
const Real & iso_hardening) const;
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
private:
/// Rate sensitivity component (rate)
Real rate;
/// Reference strain rate (edot0)
Real edot0;
/// Time step (ts)
Real ts;
};
/* -------------------------------------------------------------------------- */
/* inline functions */
/* -------------------------------------------------------------------------- */
#include "material_viscoplastic_inline_impl.cc"
__END_AKANTU__
#endif /* __AKANTU_MATERIAL_VISCOPLASTIC_HH__ */

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