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aka_voigthelper_tmpl.hh
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/**
* @file aka_voigthelper_tmpl.hh
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Fri Dec 20 2013
* @date last modification: Wed Dec 06 2017
*
* @brief implementation of the voight helper
*
*
* Copyright (©) 2014-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_voigthelper.hh"
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_AKA_VOIGTHELPER_TMPL_HH_
#define AKANTU_AKA_VOIGTHELPER_TMPL_HH_
namespace akantu {
template <UInt dim> constexpr UInt VoigtHelper<dim>::size;
/* -------------------------------------------------------------------------- */
template <UInt dim>
template <class M, class V>
inline void VoigtHelper<dim>::matrixToVoigt(M && matrix, V && vector) {
for (UInt I = 0; I < size; ++I) {
auto i = vec[I][0];
auto j = vec[I][1];
vector(I) = matrix(i, j);
}
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
template <class M>
inline decltype(auto) VoigtHelper<dim>::matrixToVoigt(M && matrix) {
Vector<Real> vector(size);
matrixToVoigt(std::forward<M>(matrix), vector);
return vector;
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
template <class M, class V>
inline void VoigtHelper<dim>::matrixToVoigtWithFactors(M && matrix,
V && vector) {
for (UInt I = 0; I < size; ++I) {
auto i = vec[I][0];
auto j = vec[I][1];
vector(I) = factors[I] * matrix(i, j);
}
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
template <class M>
inline decltype(auto) VoigtHelper<dim>::matrixToVoigtWithFactors(M && matrix) {
Vector<Real> vector(size);
matrixToVoigtWithFactors(std::forward<M>(matrix), vector);
return vector;
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
template <class M, class V>
inline void VoigtHelper<dim>::voigtToMatrix(V && vector, M && matrix) {
for (UInt I = 0; I < size; ++I) {
auto i = vec[I][0];
auto j = vec[I][1];
matrix(i, j) = matrix(j, i) = vector(I);
}
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
template <class V>
inline decltype(auto) VoigtHelper<dim>::voigtToMatrix(V && vector) {
Matrix<Real> matrix(dim, dim);
voigtToMatrix(std::forward<V>(vector), matrix);
return matrix;
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
inline void VoigtHelper<dim>::transferBMatrixToSymVoigtBMatrix(
const Matrix<Real> & B, Matrix<Real> & Bvoigt, UInt nb_nodes_per_element) {
Bvoigt.zero();
for (UInt i = 0; i < dim; ++i) {
for (UInt n = 0; n < nb_nodes_per_element; ++n) {
Bvoigt(i, i + n * dim) = B(i, n);
}
}
if (dim == 2) {
/// in 2D, fill the @f$ [\frac{\partial N_i}{\partial x}, \frac{\partial
/// N_i}{\partial y}]@f$ row
for (UInt n = 0; n < nb_nodes_per_element; ++n) {
Bvoigt(2, 1 + n * 2) = B(0, n);
Bvoigt(2, 0 + n * 2) = B(1, n);
}
}
if (dim == 3) {
for (UInt n = 0; n < nb_nodes_per_element; ++n) {
Real dndx = B(0, n);
Real dndy = B(1, n);
Real dndz = B(2, n);
/// in 3D, fill the @f$ [0, \frac{\partial N_i}{\partial y},
/// \frac{N_i}{\partial z}]@f$ row
Bvoigt(3, 1 + n * 3) = dndz;
Bvoigt(3, 2 + n * 3) = dndy;
/// in 3D, fill the @f$ [\frac{\partial N_i}{\partial x}, 0,
/// \frac{N_i}{\partial z}]@f$ row
Bvoigt(4, 0 + n * 3) = dndz;
Bvoigt(4, 2 + n * 3) = dndx;
/// in 3D, fill the @f$ [\frac{\partial N_i}{\partial x},
/// \frac{N_i}{\partial y}, 0]@f$ row
Bvoigt(5, 0 + n * 3) = dndy;
Bvoigt(5, 1 + n * 3) = dndx;
}
}
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
inline void VoigtHelper<dim>::transferBMatrixToBNL(const Matrix<Real> & B,
Matrix<Real> & Bvoigt,
UInt nb_nodes_per_element) {
Bvoigt.zero();
// see Finite element formulations for large deformation dynamic analysis,
// Bathe et al. IJNME vol 9, 1975, page 364 B_{NL}
for (UInt i = 0; i < dim; ++i) {
for (UInt m = 0; m < nb_nodes_per_element; ++m) {
for (UInt n = 0; n < dim; ++n) {
// std::cout << B(n, m) << std::endl;
Bvoigt(i * dim + n, m * dim + i) = B(n, m);
}
}
}
// TODO: Verify the 2D and 1D case
}
/* -------------------------------------------------------------------------- */
template <>
inline void VoigtHelper<1>::transferBMatrixToBL2(const Matrix<Real> & B,
const Matrix<Real> & grad_u,
Matrix<Real> & Bvoigt,
UInt nb_nodes_per_element) {
Bvoigt.zero();
for (UInt j = 0; j < nb_nodes_per_element; ++j) {
Bvoigt(0, j) = grad_u(0, 0) * B(0, j);
}
}
/* -------------------------------------------------------------------------- */
template <>
inline void VoigtHelper<3>::transferBMatrixToBL2(const Matrix<Real> & dNdX,
const Matrix<Real> & grad_u,
Matrix<Real> & Bvoigt,
UInt nb_nodes_per_element) {
Bvoigt.zero();
for (UInt I = 0; I < 3; ++I) {
for (UInt a = 0; a < nb_nodes_per_element; ++a) {
for (UInt i = 0; i < 3; ++i) {
Bvoigt(I, a * 3 + i) = grad_u(i, I) * dNdX(I, a);
}
}
}
for (UInt Iv = 3; Iv < 6; ++Iv) {
for (UInt a = 0; a < nb_nodes_per_element; ++a) {
for (UInt k = 0; k < 3; ++k) {
UInt aux = Iv - 3;
for (UInt m = 0; m < 3; ++m) {
if (m != aux) {
UInt index1 = m;
UInt index2 = 3 - m - aux;
Bvoigt(Iv, a * 3 + k) += grad_u(k, index1) * dNdX(index2, a);
}
}
}
}
}
}
/* -------------------------------------------------------------------------- */
template <>
inline void VoigtHelper<2>::transferBMatrixToBL2(const Matrix<Real> & B,
const Matrix<Real> & grad_u,
Matrix<Real> & Bvoigt,
UInt nb_nodes_per_element) {
Bvoigt.zero();
for (UInt i = 0; i < 2; ++i) {
for (UInt j = 0; j < nb_nodes_per_element; ++j) {
for (UInt k = 0; k < 2; ++k) {
Bvoigt(i, j * 2 + k) = grad_u(k, i) * B(i, j);
}
}
}
for (UInt j = 0; j < nb_nodes_per_element; ++j) {
for (UInt k = 0; k < 2; ++k) {
for (UInt m = 0; m < 2; ++m) {
UInt index1 = m;
UInt index2 = (2 - 1) - m;
Bvoigt(2, j * 2 + k) += grad_u(k, index1) * B(index2, j);
}
}
}
}
} // namespace akantu
#endif /* AKANTU_AKA_VOIGTHELPER_TMPL_HH_ */

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