/usr/include/ITK-4.9/itkFEMElement3DStrain.hxx is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.
This file is owned by root:root, with mode 0o644.
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*
* Copyright Insight Software Consortium
*
* 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
*
* http://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 itkFEMElement3DStrain_hxx
#define itkFEMElement3DStrain_hxx
#include "itkFEMElement3DStrain.h"
namespace itk
{
namespace fem
{
template <typename TBaseClass>
Element3DStrain<TBaseClass>
::Element3DStrain() : Superclass(), m_mat(ITK_NULLPTR)
{
}
// ////////////////////////////////////////////////////////////////////////
/**
* Methods related to the physics of the problem.
*/
template <typename TBaseClass>
void Element3DStrain<TBaseClass>
::GetStrainDisplacementMatrix(MatrixType & B, const MatrixType & shapeDgl) const
{
unsigned int p;
unsigned int Nn = 3 * this->GetNumberOfNodes();
B.set_size(6, Nn);
// Initialize the B matrix to zero - subsequently, only the nonzero
// terms will be filled in
B.fill(0.0);
// Copy the shape function derivatives wrt global coordinates
// in right position in B matrix.
for( unsigned int i = 0; i < Nn; i++ )
{
p = i / 3;
switch( i % 3 )
{
// case 0: /** Columns 1, 4, 7, ..., 22 */
// B[0][i] = shapeDgl[0][p];
// B[3][i] = shapeDgl[1][p];
// B[5][i] = shapeDgl[2][p];
// break;
// case 1: /** Columns 2, 5, 8, ..., 23 */
// B[1][i] = shapeDgl[1][p];
// B[3][i] = shapeDgl[0][p];
// B[4][i] = shapeDgl[2][p];
// break;
// case 2: /** Columns 3, 6, 9, ..., 24 */
// B[2][i] = shapeDgl[2][p];
// B[4][i] = shapeDgl[1][p];
// B[5][i] = shapeDgl[0][p];
// break;
case 0: /** Columns 1, 4, 7, ..., 22 */
B[0][i] = shapeDgl[0][p];
B[4][i] = shapeDgl[2][p];
B[5][i] = shapeDgl[1][p];
break;
case 1: /** Columns 2, 5, 8, ..., 23 */
B[1][i] = shapeDgl[1][p];
B[3][i] = shapeDgl[2][p];
B[5][i] = shapeDgl[0][p];
break;
case 2: /** Columns 3, 6, 9, ..., 24 */
B[2][i] = shapeDgl[2][p];
B[3][i] = shapeDgl[1][p];
B[4][i] = shapeDgl[0][p];
break;
}
}
}
template <typename TBaseClass>
void
Element3DStrain<TBaseClass>
::GetMaterialMatrix(MatrixType & D) const
{
D.set_size(6, 6);
D.fill(0.0);
/* Material properties matrix */
Float fac = ( m_mat->GetThickness() * m_mat->GetYoungsModulus() )
/ ( ( 1 + m_mat->GetPoissonsRatio() ) * ( 1 - 2 * m_mat->GetPoissonsRatio() ) );
/** Set the elements in the top left quadrant */
for( int j = 0; j < 3; j++ )
{
for( int k = 0; k < 3; k++ )
{
D[j][k] = m_mat->GetPoissonsRatio();
}
}
/** Set the diagonal elements */
for( int k = 0; k < 3; k++ )
{
D[k][k] = 1 - m_mat->GetPoissonsRatio();
}
for( int k = 3; k < 6; k++ )
{
D[k][k] = ( 1 - ( 2 * m_mat->GetPoissonsRatio() ) ) * 0.5;
}
/** Multiply by the factor */
D = D * fac;
}
template <typename TBaseClass>
void
Element3DStrain<TBaseClass>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Materials: " << this->m_mat << std::endl;
}
}
} // end namespace itk::fem
#endif // #ifndef itkFEMElement3DStrain_hxx
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