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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
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.
=========================================================================*/
// disable debug warnings in MS compiler
#ifdef _MSC_VER
# pragma warning(disable : 4786)
#endif
#include <cmath>
#include "itkFEMElement3DC0LinearTriangularMembrane.h"
namespace itk
{
namespace fem
{
Element3DC0LinearTriangularMembrane ::Element3DC0LinearTriangularMembrane()
: Superclass()
{}
Element3DC0LinearTriangularMembrane ::Element3DC0LinearTriangularMembrane(NodeIDType n1_,
NodeIDType n2_,
NodeIDType n3_,
Material::ConstPointer m_)
: Superclass()
{
// Set the geometrical points
this->SetNode(0, n1_);
this->SetNode(1, n2_);
this->SetNode(2, n3_);
/*
* Initialize the pointer to material object and check that
* we were given the pointer to the right class.
* If the material class was incorrect an exception is thrown.
*/
if ((m_mat = dynamic_cast<const MaterialLinearElasticity *>(&*m_)) == 0)
{
throw FEMExceptionWrongClass(
__FILE__, __LINE__, "Element3DC0LinearTriangularMembrane::Element3DC0LinearTriangularMembrane()");
}
}
/*
void Element3DC0LinearTriangularMembrane::GetStiffnessMatrix(MatrixType& Ke) const
{
MatrixType D;
unsigned int Nip=this->GetNumberOfIntegrationPoints(0);
VectorType ip;
Float w;
this->GetIntegrationPointAndWeight(0,ip,w,0);
//
//::std::cout<< " Nip " << Nip << " w " << w << std::endl;
this->GetMaterialMatrix(D);
Ke.set_size(3,3);
int na=0;
int nb=1;
int nc=2;
{
VectorType A=this->GetNode(na)->GetCoordinates();
VectorType B=this->GetNode(nb)->GetCoordinates();
VectorType C=this->GetNode(nc)->GetCoordinates();
VectorType BA =B-A;
VectorType AC =A-C;
VectorType CB =C-B;
float bamag=BA.magnitude();
float cbmag=CB.magnitude();
float acmag=AC.magnitude();
if (bamag > cbmag && bamag > acmag) { na=0; nb=1; nc=2; }
if (cbmag > bamag && cbmag > acmag) { na=1; nb=2; nc=0; }
if (acmag > bamag && acmag > cbmag) { na=2; nb=0; nc=1; }
}
VectorType A=this->GetNode(na)->GetCoordinates();
VectorType B=this->GetNode(nb)->GetCoordinates();
VectorType C=this->GetNode(nc)->GetCoordinates();
VectorType BA =B-A;
VectorType CA =C-A;
VectorType CB =C-B;
float bamag=BA.magnitude();
float cbmag=CB.magnitude();
float acmag=CA.magnitude();
float t=(CA[0]*BA[0]+CA[1]*BA[1]+CA[2]*BA[2])/bamag*bamag;
VectorType E = A+BA*t;
VectorType CE =C-E;
VectorType BE =B-E;
VectorType AE =A-E;
float cemag=CE.magnitude();
float bemag=CE.magnitude();
float aemag=AE.magnitude();
float h1;
if (acmag > aemag) h1=acmag; else h1=aemag;
float theta1=asin(cemag/h1);
float h2;
if (cbmag > bemag) h2=cbmag; else h2=bemag;
float theta2=asin(cemag/h2);
float theta3=acos(-1.0)-theta1-theta2;
float cottheta1=atan(theta1);
float cottheta2=atan(theta2);
float cottheta3=atan(theta3);
Ke[0][0]=(cottheta3+cottheta2)*D[0][0];
Ke[1][1]=(cottheta3+cottheta1)*D[0][0];
Ke[2][2]=(cottheta1+cottheta2)*D[0][0];
Ke[0][1]=-cottheta3*D[0][0];
Ke[0][2]=-cottheta2*D[0][0];
Ke[1][2]=-cottheta1*D[0][0];
Ke[2][1]=Ke[1][2]*D[0][0];
Ke[2][0]=Ke[0][2]*D[0][0];
Ke[1][0]=Ke[0][1]*D[0][0];
// ::std::cout << " lapl belt " << std::endl;
// ::std::cout << Ke << std::endl;
}
*/
FEM_CLASS_REGISTER(Element3DC0LinearTriangularMembrane)
} // namespace fem
} // namespace itk
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