Is the progression of the simulated forces smooth and the trend according to the engineering exceptions? Is the sum of all forces equal to 0 (are the absolute forces on upper and lower die the same)? How is the convergence behavior? See the convergence monitor and / or the status file? Is the mesh fine enough to capture the stress and strain gradients?
Is the simulated shape matching the engineering exception? Is the mesh suitable for the shape? How stable are the results if the mesh is modified?
Is the influence of different friction parameters in a reasonable range? Same for the heat transfer parameters?
What about the temperatures?
But these are all only simulation internal quality checks, which should be done, but which are not a real validation. You can and you should check the results with external references:
Take the yield strength of the material for a given temperature and strain rate matching the initial condition of the simulation. This may not be the yield strength on the data sheet (which is typically for room temperature and slow motion only), but the initial point of the relevant flow curve. Multiply it with the cross section of your specimen. The resulting force should be more or less equal to the initial force in the simulation. Note: This will not capture any errors made when collecting the material data.
Compare with experimental results.
Compare with literature.
Ask a forming expert to judge the results, they frequently have some rule of thumb to estimate the forces needed.
Ask a 2nd person to repeat your study (or some parts of it). Starting from the scratch with collecting the material data and potentially using an other software.
Is the progression of the simulated forces smooth and the trend according to the engineering exceptions? Is the sum of all forces equal to 0 (are the absolute forces on upper and lower die the same)? How is the convergence behavior? See the convergence monitor and / or the status file? Is the mesh fine enough to capture the stress and strain gradients?
Is the simulated shape matching the engineering exception? Is the mesh suitable for the shape? How stable are the results if the mesh is modified?
Is the influence of different friction parameters in a reasonable range? Same for the heat transfer parameters?
What about the temperatures?
But these are all only simulation internal quality checks, which should be done, but which are not a real validation. You can and you should check the results with external references:
Take the yield strength of the material for a given temperature and strain rate matching the initial condition of the simulation. This may not be the yield strength on the data sheet (which is typically for room temperature and slow motion only), but the initial point of the relevant flow curve. Multiply it with the cross section of your specimen. The resulting force should be more or less equal to the initial force in the simulation. Note: This will not capture any errors made when collecting the material data.
Compare with experimental results.
Compare with literature.
Ask a forming expert to judge the results, they frequently have some rule of thumb to estimate the forces needed.
Ask a 2nd person to repeat your study (or some parts of it). Starting from the scratch with collecting the material data and potentially using an other software.
