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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 itkFEMElement2DMembrane_h
#define itkFEMElement2DMembrane_h
#include "itkFEMElementBase.h"
#include "itkFEMMaterialLinearElasticity.h"
namespace itk
{
namespace fem
{
/**
* \class Element2DMembrane
* \brief Class that is used to define a membrane energy problem in 2D 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.
*
* A membrane element a two dimensional flat extensional element.
* There are two in plane displacement DOF's at each node of the element.
* The elements can be used to model two dimensional elasticity problems, plane
* strain and plane stress. The membrane element has no rotational stiffness or
* stiffness normal to the plane of the element. It can be situated arbitrarily
* in space but the resultant forces must lie in the plane of the element.
*
*
* You can specify one template parameter:
*
* TBaseClass - Class from which Element2DMembrane 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 Element2DMembrane : public TBaseClass
{
public:
/** Standard class type aliases. */
using Self = Element2DMembrane;
using Superclass = TBaseClass;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(Element2DMembrane);
// 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
*/
Element2DMembrane();
// ////////////////////////////////////////////////////////////////////////
/**
* 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;
/**
* Compute the mass matrix specific for 2D stress problems.
*/
void
GetMassMatrix(MatrixType & Me) const override;
/**
* 2D stress elements have 2 DOFs per node.
*/
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 for the element
*/
const MaterialLinearElasticity * m_mat{ nullptr };
}; // class Element2DMembrane
} // end namespace fem
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkFEMElement2DMembrane.hxx"
#endif
#endif // itkFEMElement2DMembrane_h
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