ElasticTangentStiffnessModel.cpp

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#include "ElasticTangentStiffnessModel.h"
 
#include "MaterialLib/MPL/Utils/FormEigenTensor.h"
 
namespace ProcessLib::TH2M
{
namespace ConstitutiveRelations
{
template <int DisplacementDim>
void ElasticTangentStiffnessModel<DisplacementDim>::eval(
    SpaceTimeData const& x_t, TemperatureData const& T_data,
    ElasticTangentStiffnessData<DisplacementDim>& out) const
{
    namespace MPL = MaterialPropertyLib;
 
    MPL::VariableArray variable_array;
    MPL::VariableArray variable_array_prev;
 
    auto const null_state = solid_material_.createMaterialStateVariables();
    solid_material_.initializeInternalStateVariables(x_t.t, x_t.x, *null_state);
 
    using KV = KelvinVector<DisplacementDim>;
 
    variable_array.stress.emplace<KV>(KV::Zero());
    variable_array.mechanical_strain.emplace<KV>(KV::Zero());
    variable_array.temperature = T_data.T;
 
    variable_array_prev.stress.emplace<KV>(KV::Zero());
    variable_array_prev.mechanical_strain.emplace<KV>(KV::Zero());
    variable_array_prev.temperature = T_data.T_prev;
 
    auto&& solution = solid_material_.integrateStress(
        variable_array_prev, variable_array, x_t.t, x_t.x, x_t.dt, *null_state);
 
    if (!solution)
    {
        OGS_FATAL("Computation of elastic tangent stiffness failed.");
    }
 
    out.stiffness_tensor = std::move(std::get<2>(*solution));
}
 
template struct ElasticTangentStiffnessModel<2>;
template struct ElasticTangentStiffnessModel<3>;
}  // namespace ConstitutiveRelations
}  // namespace ProcessLib::TH2M