The following input files were used for this problem:
linear_non_prestressed.dat -- Linear non-prestressed modal solve input file
partial_prestressed.dat -- Partial prestressed modal solve input file
full_non_linear.dat -- Full nonlinear prestressed modal solve input file
linear_non_prestressed_par.dat -- Parametric studies with increasing coefficient of friction
disc_pad_model.cdb -- Common database file used for the linear non-prestressed modal analysis, the partial prestressed modal analysis, and the full nonlinear prestressed modal analysis (called by the linear_non_prestressed.dat, partial_prestressed.dat, full_non_linear.dat and linear_non_prestressed_par.dat files, respectively).