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Sun, Dec 22, 16:40

material_brittle.hh
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/**
* @file material_brittle.hh
*
* @author Aranda Ruiz Josue <josue.arandaruiz@epfl.ch>
* @author Daniel Pino Muñoz <daniel.pinomunoz@epfl.ch>
*
*
* @brief Brittle damage law
*
* @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_damage.hh"
#include "material.hh"
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_MATERIAL_BRITTLE_HH__
#define __AKANTU_MATERIAL_BRITTLE_HH__
__BEGIN_AKANTU__
/**
* Material brittle
*
* parameters in the material files :
* - S_0 : Critical stress at low strain rate (default: 157e6)
* - E_0 : Low strain rate threshold (default: 27e3)
* - A,B,C,D : Fitting parameters for the critical stress at high strain rates
* (default: 1.622e-11, -1.3274e-6, 3.6544e-2, -181.38)
*/
template<UInt spatial_dimension>
class MaterialBrittle : public MaterialDamage<spatial_dimension> {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
MaterialBrittle(SolidMechanicsModel & model, const ID & id = "");
virtual ~MaterialBrittle() {};
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
void initMaterial();
virtual void updateInternalParameters();
/// constitutive law for all element of a type
void computeStress(ElementType el_type, GhostType ghost_type = _not_ghost);
protected:
/// constitutive law for a given quadrature point
inline void computeStressOnQuad(Matrix<Real> & grad_u,
Matrix<Real> & grad_v,
Matrix<Real> & sigma,
Real & dam,
Real & sigma_equivalent,
Real & fracture_stress);
inline void computeDamageAndStressOnQuad(Matrix<Real> & sigma,
Real & dam,
Real & sigma_c,
Real & fracture_stress);
/* ------------------------------------------------------------------------ */
/* DataAccessor inherited members */
/* ------------------------------------------------------------------------ */
public:
inline virtual UInt getNbDataForElements(const Array<Element> & elements,
SynchronizationTag tag) const;
inline virtual void packElementData(CommunicationBuffer & buffer,
const Array<Element> & elements,
SynchronizationTag tag) const;
inline virtual void unpackElementData(CommunicationBuffer & buffer,
const Array<Element> & elements,
SynchronizationTag tag);
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected:
/// strain rate arrays ordered by element types
InternalField<Real> strain_rate_brittle;
//polynome constants for critical stress value
Real A;
Real B;
Real C;
Real D;
//minimum strain rate
Real E_0;
//Critical stress at low strain rates
Real S_0;
};
/* -------------------------------------------------------------------------- */
/* inline functions */
/* -------------------------------------------------------------------------- */
#include "material_brittle_inline_impl.cc"
__END_AKANTU__
#endif /* __AKANTU_MATERIAL_brittle_HH__ */

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