ABSTRACT:

This paper deals with the linear two-dimensional task concerning the effect of the impulsive loads on a viscoelastic ice plate on the water surface. The three-dimensional experimental investigation of unsteady behavior of polymer plate due to successive and simultaneous shots is presented also. Analysis is made of the following factors: the variable depth of the basin, the time interval and the sequence of impulses activation on the amplitude of the plate deflection. There was derived that the maximum plate deflections occur at a sequential-applied in pairs regime of impulses(from the ends to the center, the central impulse is the last). Good agreement of theoretical and experimental results is obtained.

INTRODUCTION

Ice blasting is known to be one of the ways of ice cover destruction. A number of charging devices are very often used to do it, they being located at a certain distance from one another and actuated either simultaneously or successively. The effect of a singular shock impulse on an ice sheet has been investigated well enough by Kerr (1976), Fox (1993), and their other works. An extensive bibliography on ice cover destruction is presented by Squire et al (1996). In the works by Kozin and Pogorelova (2004) and Kozin and Pogorelova (2006) the problem was further developed for viscoelastic plate in axial-symmetric and two-dimensional tasks. The paper by Kozin and Zhyostkaya (2008) is devoted to a numeric solution of the problem on the effect of a shock pulse on the ice plate. The asymptotic investigations by Lu and Dai (2006) are dedicated to detecting the icecovered and free-surface waves at a distance from the impulse point load or from the initial ice-plate deflection. The work by Lu and Dai (2008) continues these investigations for the dynamic responses of icecover fluid to a submerged point mass source.

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