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/*=========================================================================
*
* Copyright NumFOCUS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#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 this 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.
* \ingroup ITKFEM
*/
template <typename TBaseClass = Element>
class ITK_TEMPLATE_EXPORT Element1DStress : public TBaseClass
{
public:
/** Standard class type aliases. */
using Self = Element1DStress;
using Superclass = TBaseClass;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(Element1DStress);
// Repeat the required type alias and enums from parent class
using typename Superclass::Float;
using typename Superclass::MatrixType;
using typename Superclass::VectorType;
/**
* Default constructor only clears the internal storage
*/
Element1DStress();
// ////////////////////////////////////////////////////////////////////////
/*
* Methods related to the physics of the problem.
*/
/**
* Compute the B matrix.
*/
void
GetStrainDisplacementMatrix(MatrixType & B, const MatrixType & shapeDgl) const override;
/**
* Compute the D matrix.
*/
void
GetMaterialMatrix(MatrixType & D) const override;
/**
* 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.
*/
void
GetStiffnessMatrix(MatrixType & Ke) const override;
/**
* 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.
*/
unsigned int
GetNumberOfDegreesOfFreedomPerNode() const override
{
return 2;
}
/**
* Get/Set the material properties for the element
*/
Material::ConstPointer
GetMaterial() const override
{
return m_mat;
}
void
SetMaterial(Material::ConstPointer mat_) override
{
m_mat = dynamic_cast<const MaterialLinearElasticity *>(mat_.GetPointer());
}
protected:
void
PrintSelf(std::ostream & os, Indent indent) const override;
/**
* Pointer to material properties of the element
*/
const MaterialLinearElasticity * m_mat{ nullptr };
}; // class Element1DStress
} // end namespace fem
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkFEMElement1DStress.hxx"
#endif
#endif // itkFEMElement1DStress_h
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