Hi every one. I am using Catia to perform a stress analysis on a metal frame. However, I heard that the analysis in catia is not sufficiently good for engineering. so I wonder the following things: 1. the calculation model between catia and other structural analysis software (e.g. Ansys) 2. how can i know the stress error value from "energy" (the catia gives me accuracy in "Jole" =0= ) 3. Which values should I read or what do they means? (Vos misses VS principle stresses) Thanks alot for your kind help.