Dear delii members
While modifying the material model in the step-44.cc, implementation of the
function *get_Jc_vol(). *I found the implementation in the code is
different than the formula provided. The worse part is that the solution
stops converging after correcting the implementation. I will be really
grateful if some one can hint me as, I am stuck between convergence and
divergence of material models from quite some time.
The given implementation is:
SymmetricTensor<4, dim>
<https://www.dealii.org/current/doxygen/deal.II/classSymmetricTensor.html>
get_Jc_vol() const
{
return p_tilde * det_F *
(Physics::Elasticity::StandardTensors<dim>::IxI
<https://www.dealii.org/current/doxygen/deal.II/classPhysics_1_1Elasticity_1_1StandardTensors.html>
-
(2.0 * Physics::Elasticity::StandardTensors<dim>::S
<https://www.dealii.org/current/doxygen/deal.II/classPhysics_1_1Elasticity_1_1StandardTensors.html>
))
}
The implementation as per formula, should have been:
SymmetricTensor<4, dim> get_Jc_vol() const
{
return det_F * ( (get_dPsi_vol_dJ() +
det_F*get_d2Psi_vol_dJ2() )
*Physics::Elasticity::StandardTensors<dim>::IxI
- (2.0 * get_dPsi_vol_dJ() *
Physics::Elasticity::StandardTensors<dim>::S) );
}
Thank you,
Regards,
Navneet R
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