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Global bifurcations and multipulse chaotic dynamics for a simply supported functionally graded materials (FGMs) rectangular plate are studied using the energy-phase method for the first time.The FGMs rectangular plate is subjected to the transversal and in-plane excitations.Material properties are assumed to be temperature-dependent.Based on the Reddys third-order plate theory, the nonlinear governing equations of motion for the FGMs plate are derived using the Hamiltons principle.The Galerkins method is utilized to discretize the governing partial equations to a two-degree-of-freedom nonlinear system including the quadratic and cubic nonlinear terms under combined parametric and external excitations.