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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkFEMElement1DStress.h,v $
Language: C++
Date: $Date: 2009-01-28 21:19:15 $
Version: $Revision: 1.7 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkFEMElement1DStress_h
#define __itkFEMElement1DStress_h
#include "itkFEMElementBase.h"
#include "itkFEMMaterialLinearElasticity.h"
namespace itk {
namespace fem {
/**
* \class Element1DStress
* \brief Class that is used to define linear elasticity problem in 1D space.
*
* This class only defines the physics of the problem. Use his class together
* with element classes that specify the geometry to fully define the element.
*
* You can specify one template parameter:
*
* TBaseClass - Class from which Element1DStress is derived. TBaseClass must
* be derived from the Element base class. This enables you
* to use this class at any level of element definition.
* If not specified, it defaults to the Element base class.
*/
template<class TBaseClass=Element>
class Element1DStress : public TBaseClass
{
FEM_ABSTRACT_CLASS(Element1DStress,TBaseClass)
public:
// Repeat the required typedefs and enums from parent class
typedef typename Superclass::Float Float;
typedef typename Superclass::MatrixType MatrixType;
typedef typename Superclass::VectorType VectorType;
/**
* Read data for this class from input stream
*/
virtual void Read( std::istream&, void* info );
/**
* Write this class to output stream
*/
virtual void Write( std::ostream& f ) const;
/**
* Default constructor only clears the internal storage
*/
Element1DStress();
//////////////////////////////////////////////////////////////////////////
/*
* Methods related to the physics of the problem.
*/
/**
* Compute the B matrix.
*/
virtual void GetStrainDisplacementMatrix(MatrixType& B, const MatrixType& shapeDgl) const;
/**
* Compute the D matrix.
*/
virtual void GetMaterialMatrix(MatrixType& D) const;
/**
* Element stiffness matrix is reimplemented here, because we want to
* be able to use this class to implement 1D stress problem in any
* number of dimensions i.e. Bar1D, Bar2D, Bar3D.
*/
virtual void GetStiffnessMatrix(MatrixType& Ke) const;
/**
* 1D stress elements have 2 DOFs per node. In reality there is
* only one, but it usually makes sense to separate it into the
* components that correspond to specific dimensions in space.
* So the number of DOFs per node is equal to the number of
* spatial dimensions.
*/
virtual unsigned int GetNumberOfDegreesOfFreedomPerNode( void ) const
{ return 2; }
public:
/**
* Pointer to material properties of the element
*/
MaterialLinearElasticity::ConstPointer m_mat;
virtual Material::ConstPointer GetMaterial(void) const { return m_mat; }
virtual void SetMaterial(Material::ConstPointer mat_ ) { m_mat=dynamic_cast<const MaterialLinearElasticity*>(&*mat_); }
}; // class Element1DStress
#ifdef _MSC_VER
// Declare a static dummy function to prevent a MSVC 6.0 SP5 from crashing.
// I have no idea why things don't work when this is not declared, but it
// looks like this declaration makes compiler forget about some of the
// troubles it has with templates.
static void Dummy( void );
#endif // #ifdef _MSC_VER
}} // end namespace itk::fem
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkFEMElement1DStress.txx"
#endif
#endif // #ifndef __itkFEMElement1DStress_h
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