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bug-fixes for sensitivity analysis of stress evaluation. #39

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Merged
manavbhatia merged 1 commit into from
Oct 10, 2019
Merged

bug-fixes for sensitivity analysis of stress evaluation. #39

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2 changes: 1 addition & 1 deletion examples/structural/base/thermal_stress_jacobian_scaling_function.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,7 @@ MAST::Examples::ThermalJacobianScaling::operator() (Real& val) const {

if (max_res > 0.)
max_log = std::log10(max_res);
val = std::fmax(1.-std::exp(_accel_factor*(log-max_log)), low);
val = std::fmax(std::pow(1-res/max_res, _accel_factor), low);
//libMesh::out << log << " " << max_log << " " << val << std::endl;
}
}
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19 changes: 13 additions & 6 deletions src/elasticity/structural_element_1d.cpp
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Expand Up @@ -247,7 +247,9 @@ MAST::StructuralElement1D::calculate_stress(bool request_derivative,
strain_3D = RealVectorX::Zero(6),
stress_3D = RealVectorX::Zero(6),
dstrain_dp = RealVectorX::Zero(n1),
dstress_dp = RealVectorX::Zero(n1);
dstress_dp = RealVectorX::Zero(n1),
vec1 = RealVectorX::Zero(n2),
vec2 = RealVectorX::Zero(n2);

MAST::FEMOperatorMatrix
Bmat_mem,
Expand Down Expand Up @@ -433,8 +435,12 @@ MAST::StructuralElement1D::calculate_stress(bool request_derivative,
dstress_dX = material_mat * dstrain_dX;

// copy to the 3D structure
dstress_dX_3D.row(0) = dstress_dX.row(0);
dstrain_dX_3D.row(0) = dstrain_dX.row(0);
vec1 = dstress_dX.row(0);
this->transform_vector_to_global_system(vec1, vec2);
dstress_dX_3D.row(0) = vec2;
vec1 = dstrain_dX.row(0);
this->transform_vector_to_global_system(vec1, vec2);
dstrain_dX_3D.row(0) = vec2;

if (request_derivative)
data->set_derivatives(dstress_dX_3D, dstrain_dX_3D);
Expand All @@ -461,7 +467,7 @@ MAST::StructuralElement1D::calculate_stress(bool request_derivative,
temp_func->derivative(*p, xyz[qp_loc_index], _time, dtemp);
ref_temp_func->derivative(*p, xyz[qp_loc_index], _time, dref_t);
alpha_func->derivative(*p, xyz[qp_loc_index], _time, dalpha);
dstrain_dp(0) -= alpha*(dtemp-dref_t) - dalpha*(temp-ref_t);
dstrain_dp(0) -= alpha*(dtemp-dref_t) + dalpha*(temp-ref_t);
}

// include the dependence of strain on the thickness
Expand Down Expand Up @@ -2098,7 +2104,7 @@ MAST::StructuralElement1D::thermal_residual_sensitivity (const MAST::FunctionBas
&temp_func = bc.get<MAST::FieldFunction<Real> >("temperature"),
&ref_temp_func = bc.get<MAST::FieldFunction<Real> >("ref_temperature");

Real t, t0, t_sens;
Real t, t0, t_sens, t0_sens;

for (unsigned int qp=0; qp<JxW.size(); qp++) {

Expand All @@ -2112,8 +2118,9 @@ MAST::StructuralElement1D::thermal_residual_sensitivity (const MAST::FunctionBas
temp_func(xyz[qp], _time, t);
temp_func.derivative(p, xyz[qp], _time, t_sens);
ref_temp_func(xyz[qp], _time, t0);
ref_temp_func.derivative(p, xyz[qp], _time, t0_sens);
delta_t(0) = t-t0;
delta_t_sens(0) = t_sens;
delta_t_sens(0) = t_sens-t0_sens;

// now prepare the membrane force sensitivity
vec1_n1 = material_exp_A_mat * delta_t_sens; // [C]{alpha (dT/dp)} (with membrane strain)
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43 changes: 32 additions & 11 deletions src/elasticity/structural_element_2d.cpp
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Expand Up @@ -334,7 +334,9 @@ MAST::StructuralElement2D::calculate_stress(bool request_derivative,
strain_3D = RealVectorX::Zero(6),
stress_3D = RealVectorX::Zero(6),
dstrain_dp = RealVectorX::Zero(n1),
dstress_dp = RealVectorX::Zero(n1);
dstress_dp = RealVectorX::Zero(n1),
vec1 = RealVectorX::Zero(n2),
vec2 = RealVectorX::Zero(n2);


FEMOperatorMatrix
Expand Down Expand Up @@ -526,12 +528,30 @@ MAST::StructuralElement2D::calculate_stress(bool request_derivative,
dstress_dX = material_mat * dstrain_dX;

// copy to the 3D structure
dstress_dX_3D.row(0) = dstress_dX.row(0); // sigma-xx
dstress_dX_3D.row(1) = dstress_dX.row(1); // sigma-yy
dstress_dX_3D.row(3) = dstress_dX.row(2); // tau-xy
dstrain_dX_3D.row(0) = dstrain_dX.row(0); // epsilon-xx
dstrain_dX_3D.row(1) = dstrain_dX.row(1); // epsilon-yy
dstrain_dX_3D.row(3) = dstrain_dX.row(2); // gamma-xy
// sigma-xx
vec1 = dstress_dX.row(0);
this->transform_vector_to_global_system(vec1, vec2);
dstress_dX_3D.row(0) = vec2;
// sigma-yy
vec1 = dstress_dX.row(1);
this->transform_vector_to_global_system(vec1, vec2);
dstress_dX_3D.row(1) = vec2;
// tau-xy
vec1 = dstress_dX.row(2);
this->transform_vector_to_global_system(vec1, vec2);
dstress_dX_3D.row(3) = vec2;
// epsilon-xx
vec1 = dstrain_dX.row(0);
this->transform_vector_to_global_system(vec1, vec2);
dstrain_dX_3D.row(0) = vec2;
// epsilon-yy
vec1 = dstrain_dX.row(1);
this->transform_vector_to_global_system(vec1, vec2);
dstrain_dX_3D.row(1) = vec2;
// gamma-xy
vec1 = dstrain_dX.row(2);
this->transform_vector_to_global_system(vec1, vec2);
dstrain_dX_3D.row(3) = vec2;

if (request_derivative)
data->set_derivatives(dstress_dX_3D, dstrain_dX_3D);
Expand Down Expand Up @@ -559,8 +579,8 @@ MAST::StructuralElement2D::calculate_stress(bool request_derivative,
temp_func->derivative(*p, xyz[qp_loc_index], _time, dtemp);
ref_temp_func->derivative(*p, xyz[qp_loc_index], _time, dref_t);
alpha_func->derivative(*p, xyz[qp_loc_index], _time, dalpha);
dstrain_dp(0) -= alpha*(dtemp-dref_t) - dalpha*(temp-ref_t); // epsilon-xx
dstrain_dp(1) -= alpha*(dtemp-dref_t) - dalpha*(temp-ref_t); // epsilon-yy
dstrain_dp(0) -= alpha*(dtemp-dref_t) + dalpha*(temp-ref_t); // epsilon-xx
dstrain_dp(1) -= alpha*(dtemp-dref_t) + dalpha*(temp-ref_t); // epsilon-yy
}


Expand Down Expand Up @@ -2715,7 +2735,7 @@ thermal_residual_sensitivity (const MAST::FunctionBase& p,
&temp_func = bc.get<MAST::FieldFunction<Real> >("temperature"),
&ref_temp_func = bc.get<MAST::FieldFunction<Real> >("ref_temperature");

Real t, t0, t_sens;
Real t, t0, t_sens, t0_sens;

for (unsigned int qp=0; qp<JxW.size(); qp++) {

Expand All @@ -2734,8 +2754,9 @@ thermal_residual_sensitivity (const MAST::FunctionBase& p,
temp_func(xyz[qp], _time, t);
temp_func.derivative(p, xyz[qp], _time, t_sens);
ref_temp_func(xyz[qp], _time, t0);
ref_temp_func.derivative(p, xyz[qp], _time, t0_sens);
delta_t(0) = t-t0;
delta_t_sens(0) = t_sens;
delta_t_sens(0) = t_sens-t0_sens;

// now prepare the membrane force sensitivity
vec1_n1 = material_exp_A_mat * delta_t_sens; // [C]{alpha dT/dp} (with membrane strain)
Expand Down