INITIAL MESH SIZE FOR AUTOMATIC CONVERGENCE MESHING

[joseiochoam]

Dear John and All, if you could help me,

I´m trying to apply automatic local refinement to my model, and I have a question. I start with default mesh size (55 mm for my model) and the maximum stress (von Misses) that I obtain is about 84 MPa. But if I start with a smaller mesh of 30 mm (for general mesh is the result that I obtained by manual mesh convergence), and that apparently it seems a tighter and "nicer" mesh, then the stress value I get is higher (more than 100 MPa). What is the correct option? May I always start with the default mesh or I have to use other size mesh to start?

I´m using 10 interations and 5% as stop criteria . Thank you! (please find below enclosed both results).