“Wandering” eigenfrequencies of a two-dimensional elastic body with a blunted cusp

Abstract

At the pointed cusp of a two-dimensional plate, a tip of small length h is broken off. By means of asymptotic analysis, a new effect of “wandering” of eigenfrequencies of longitudinal vibrations of the plate with the blunted cusp is found: as h → +0, the frequencies prove to be almost periodic functions in the logarithmic scale ln h; i.e., when the fragment length decreases, they chaotically move at a high speed O(h⁻¹) along the real semi-axis (κ_†, +∞), while κ_† > 0 is the cutoff point of the continuous spectrum of the problem with an ideal cusp.