From ca9780d4f7e5ea428ed6cbb57fdd7fba4c85ed52 Mon Sep 17 00:00:00 2001
From: Dmitri Naumov <github@naumov.de>
Date: Tue, 21 Jan 2020 10:13:46 +0100
Subject: [PATCH] [MatL] MFront; Add back and forth rotations.
The tensors are rotated before being passed to MFront.
The results of MFront including the stiffness tensor.
---
MaterialLib/SolidModels/MFront/MFront.cpp | 44 ++++++++++++++++++++---
1 file changed, 39 insertions(+), 5 deletions(-)
diff --git a/MaterialLib/SolidModels/MFront/MFront.cpp b/MaterialLib/SolidModels/MFront/MFront.cpp
index cb81b3c82ed..dd5dbeb5181 100644
--- a/MaterialLib/SolidModels/MFront/MFront.cpp
+++ b/MaterialLib/SolidModels/MFront/MFront.cpp
@@ -258,6 +258,8 @@ MFront<DisplacementDim>::integrateStress(
material_state_variables,
double const T) const
{
+ using namespace MathLib::KelvinVector;
+
assert(
dynamic_cast<MaterialStateVariables const*>(&material_state_variables));
// New state, copy of current one, packed in unique_ptr for return.
@@ -290,19 +292,44 @@ MFront<DisplacementDim>::integrateStress(
auto v = mgis::behaviour::make_view(behaviour_data);
- auto const eps_prev_MFront = OGSToMFront(eps_prev);
+ // rotation tensor
+ auto const Q = [this, &x]() -> KelvinMatrixType<DisplacementDim> {
+ if (!_local_coordinate_system)
+ {
+ return KelvinMatrixType<DisplacementDim>::Identity();
+ }
+ return fourthOrderRotationMatrix(
+ _local_coordinate_system->transformation<DisplacementDim>(x));
+ }();
+
+ auto const eps_prev_MFront =
+ OGSToMFront(Q.transpose()
+ .template topLeftCorner<
+ KelvinVectorDimensions<DisplacementDim>::value,
+ KelvinVectorDimensions<DisplacementDim>::value>() *
+ eps_prev);
for (auto i = 0; i < KelvinVector::SizeAtCompileTime; ++i)
{
v.s0.gradients[i] = eps_prev_MFront[i];
}
- auto const eps_MFront = OGSToMFront(eps);
+ auto const eps_MFront =
+ OGSToMFront(Q.transpose()
+ .template topLeftCorner<
+ KelvinVectorDimensions<DisplacementDim>::value,
+ KelvinVectorDimensions<DisplacementDim>::value>() *
+ eps);
for (auto i = 0; i < KelvinVector::SizeAtCompileTime; ++i)
{
v.s1.gradients[i] = eps_MFront[i];
}
- auto const sigma_prev_MFront = OGSToMFront(sigma_prev);
+ auto const sigma_prev_MFront =
+ OGSToMFront(Q.transpose()
+ .template topLeftCorner<
+ KelvinVectorDimensions<DisplacementDim>::value,
+ KelvinVectorDimensions<DisplacementDim>::value>() *
+ sigma_prev);
for (auto i = 0; i < KelvinVector::SizeAtCompileTime; ++i)
{
v.s0.thermodynamic_forces[i] = sigma_prev_MFront[i];
@@ -321,7 +348,10 @@ MFront<DisplacementDim>::integrateStress(
{
sigma[i] = behaviour_data.s1.thermodynamic_forces[i];
}
- sigma = MFrontToOGS(sigma);
+ sigma = Q.template topLeftCorner<
+ KelvinVectorDimensions<DisplacementDim>::value,
+ KelvinVectorDimensions<DisplacementDim>::value>() *
+ MFrontToOGS(sigma);
// TODO row- vs. column-major storage order. This should only matter for
// anisotropic materials.
@@ -330,7 +360,11 @@ MFront<DisplacementDim>::integrateStress(
OGS_FATAL("Stiffness matrix has wrong size.");
KelvinMatrix C =
- MFrontToOGS(Eigen::Map<KelvinMatrix>(behaviour_data.K.data()));
+ Q * MFrontToOGS(Eigen::Map<KelvinMatrix>(behaviour_data.K.data())) *
+ Q.transpose()
+ .template topLeftCorner<
+ KelvinVectorDimensions<DisplacementDim>::value,
+ KelvinVectorDimensions<DisplacementDim>::value>();
return std::make_optional(
std::make_tuple<typename MFront<DisplacementDim>::KelvinVector,
--
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