I am using bone model in finite element analysis. There are not many references that emphasize on how their mesh convergence analysis was done in detail. What I assume is by finding the max Von Mises stress on one simulation having element size of X, and redo the simulation with element size of X/2 and get another max Von Mises stress. I'd do it repeatedly until X/16.
But is my assumption already correct? Or should I use something like root mean square calculation?
There is no fixed amount like X/16. Optimal mesh size depends on the model geometry. It must assures that stress gradients are captured adequately
try to plot and evaluate the variation of your parameter ( which is here Max von Mises stress) with number of elements in your model, or in the location/region of your interest, both plot will provide you converged value of your studied parameter for a specific mesh with reasonably accuracy, taking into account the analysis running time of your problem.
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