Fusion's automatic quasi-static analysis uses explicit dynamics algorithms to solve highly nonlinear simulations. These nonlinear simulations often do not run successfully with an implicit solver using Newton’s method.
The automatic quasi-static analysis uses a multi-trial algorithm to converge the problem in four iterations or fewer. Most models converge within two trials, some require three, or rarely, four. If the models do not converge in four trials, they are likely unstable and are buckling during the large deformation motion.
The solution at each step is a transient solution in pseudo-time. Since the results are typically highly nonlinear and path-dependent, intermediate results are written at specified points during the pseudo-time of each step. You can specify how many intermediate results you want per step; the default number is 10.