The object of the present paper is to investigate the dynamic stability of bimodulus thick circular and annular plates subjected to a combination of a pure dynamic bending and a uniform dynamic extensional stress in the plane of the plate. The Mindlin plate finite element model is established to solve the dynamic stability problems of an axisymmetric circular plate. A ring type element is chosen to approach the axisymmetric problem. The obtained results of the dynamic stability region are shown to be very good when compared with the closed form solutions for ordinary plates. The influences of various parameters on the dynamic stability boundary are studied.
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