Nonlinear Dynamics of Stiffened Flat Panels under Thermomechanical Loads

This paper investigates the effects of geometrical nonlinearities on dynamics of orthogonally stiffened flat panels featuring initial geometric imperfections and subjected to a temperature and a lateral pressure field. To this end, the equations governing the small finite deflection theory of stiffened flat panels incorporating the dynamic effects are established. Numerical simulations involving simply supported square panels with movable in-plane edge conditions highlighting the frequency-temperature interaction for prescribed lateral load amplitudes are presented, and implications played by stiffening parameters in conjunction with initial geometric imperfections are outlined.