The attachment also includes a time trace of the axial stress, bending stress, shear stress and von Mises stress in the worst case bolt. The stresses seem to match the general behavior of the panel - initially several ripples form, which then coalesce into one concave "dish". This occurs around 0.035 sec, where you see the peak axial stress (green), due to bolt prying (contact is modeled at the interface between the plate and fixture bolting flange). The plate then rebounds and dishes outward. Peak displacement in this mode occurs at about 0.13 sec, where you see the peak bending stress (red).
My question is this: would you post-process the beam moments in the same way I did? Or am I overstating the bending stress?
I have found that at my company, the methods used to model fasteners, and the methods used to post-process fastener results vary widely. I am still trying to get a handle on when different methods should be used, and I also am very interested in getting input from analysts outside my company. Hence the forum post! Thank you for your time.