Application of the tolerance averaging method to analysis of dynamical stability of thin periodic plates

Some problems of a dynamical stability of thin periodic plates are considered. As a tool to derive the governing equations of an averaged non-asymptotic plate model the tolerance averaging is applied, proposed for periodic composites and structures by Woźniak and Wierzbicki (2000). This method applied to the known Kirchhoff-type plate equation leads to averaged models taking into account the effect of the period lengths on the overall plate behaviour (Jędrysiak, 2001). Here, a non-asymptotic model describing the problems of a dynamical stability of periodic plates is formulated. Moreover, it is shown that the effect of the period lengths plays a crucial role in some special cases of dynamical stability of such plates, i.e. for higher oscillation frequencies of compressive forces in the plate midplane.