Abstract: This paper gives the exact solution of large deflection of circular sandwich plate under the action of uniform lateral load by the method of power series. Making use of this solution, we can judge the accuracy of Liu Ren-huai’s⁽⁴⁾ analytic solution obtained by means of the modified iteration method. This indicates that the previous solution has very satisfactory accuracy.

Key words: strongly nonlinear system, subharmonic and ultraharmonic resonance, parameter transformation