Hi
I have a solid mechanics problem comprising a hyperelastic material (Mooney-Rivlin(2 params) that is placed under compression resulting in large deformation. The construction is such that contact takes place resulting in a change in compressive stiffness as load is applied.
To date I have had very limited success using an auxillary sweep load with Lagrangian contacts in 2d axisymmetric and as soon as I consider 3D the success in terms of convergence if further reduced.
I'm thinking that perhaps I need to consider using an explicit time-dependent solver (no previous experience), Runge-Kutta, but when I attempt to set this up I getting the following error "singular explicit time stepping matrix" ...obviously I have something not quite correct but I am unsure where to start looking. I have also set 'linear solver to lumped'.
CG
I have a solid mechanics problem comprising a hyperelastic material (Mooney-Rivlin(2 params) that is placed under compression resulting in large deformation. The construction is such that contact takes place resulting in a change in compressive stiffness as load is applied.
To date I have had very limited success using an auxillary sweep load with Lagrangian contacts in 2d axisymmetric and as soon as I consider 3D the success in terms of convergence if further reduced.
I'm thinking that perhaps I need to consider using an explicit time-dependent solver (no previous experience), Runge-Kutta, but when I attempt to set this up I getting the following error "singular explicit time stepping matrix" ...obviously I have something not quite correct but I am unsure where to start looking. I have also set 'linear solver to lumped'.
CG