Hi, I want to understand how stress concentration factor or notch factor is considered in FEA method. Lets assume a case of stepped shaft which has got the left end of the shaft fixed with rigid wall and the other end being pulled by an axial load. In the case of conventional calculation method, stress is given by load over area. At the location of the step, the stress found is multiplied by a stress concentration or a notch factor based on some guideline. If it is done using any 3D FEA package, the software, by its own, shows the highest stress at the step. How does FEA find out a suitable stress concentration factor? Can someone help? Thanks.