/usr/include/ITK-4.9/itkFEMElement3DMembrane.hxx is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | /*=========================================================================
*
* 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 itkFEMElement3DMembrane_hxx
#define itkFEMElement3DMembrane_hxx
#include "itkFEMElement3DMembrane.h"
namespace itk
{
namespace fem
{
template <typename TBaseClass>
Element3DMembrane<TBaseClass>
::Element3DMembrane() : Superclass(), m_mat(ITK_NULLPTR)
{
}
// ////////////////////////////////////////////////////////////////////////
/**
* Methods related to the physics of the problem.
*/
template <typename TBaseClass>
void
Element3DMembrane<TBaseClass>
::GetStrainDisplacementMatrix(MatrixType & B, const MatrixType & shapeDgl) const
{
unsigned int p;
unsigned int Nn = this->GetNumberOfNodes();
B.set_size(9, 3 * Nn); // note minor difference from 2D membrane
// Copy the shape function derivatives to the B matrix.
for( unsigned int i = 0; i < Nn; i++ )
{
// Compute B index
p = i * 3;
// Compute B elements
// below are the dN/dx entries
B[0][p] = shapeDgl[0][i];
B[0][p + 1] = 0.0;
B[0][p + 2] = 0.0;
B[1][p] = 0.0;
B[1][p + 1] = shapeDgl[0][i];
B[1][p + 2] = 0.0;
B[2][p] = 0.0;
B[2][p + 1] = 0.0;
B[2][p + 2] = shapeDgl[0][i];
// below are the dN/dy entries
B[3][p] = shapeDgl[1][i];
B[3][p + 1] = 0.0;
B[3][p + 2] = 0.0;
B[4][p] = 0.0;
B[4][p + 1] = shapeDgl[1][i];
B[4][p + 2] = 0.0;
B[5][p] = 0.0;
B[5][p + 1] = 0.0;
B[5][p + 2] = shapeDgl[1][i];
// below are the dN/dz entries
B[6][p] = shapeDgl[2][i];
B[6][p + 1] = 0.0;
B[6][p + 2] = 0.0;
B[7][p] = 0.0;
B[7][p + 1] = shapeDgl[2][i];
B[7][p + 2] = 0.0;
B[8][p] = 0.0;
B[8][p + 1] = 0.0;
B[8][p + 2] = shapeDgl[2][i];
}
}
template <typename TBaseClass>
void
Element3DMembrane<TBaseClass>
::GetMassMatrix(MatrixType & Me) const
{
// Call the parent's get matrix function
Superclass::GetMassMatrix(Me);
// Since parent class doesn't have the material properties,
// we need to adjust Me matrix here for the density of the element.
Me = Me * m_mat->GetDensityHeatProduct();
}
template <typename TBaseClass>
void
Element3DMembrane<TBaseClass>
::GetMaterialMatrix(MatrixType & D) const
{
unsigned int d = 9;
D.set_size(d, d);
D.fill(0.0);
// This is the main difference from the linear elasticity problem.
/* Material properties matrix. Simpler than linear elasticity. */
Float disot = m_mat->GetYoungsModulus();
for( unsigned int i = 0; i < d; i++ )
{
D[i][i] = disot;
}
}
template <typename TBaseClass>
void
Element3DMembrane<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 itkFEMElement3DMembrane_hxx
|