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ABSTRACT
In this paper we demonstrate an unexpected type of dynamic contact phenomenon which arises when a large object impacts a thin flexible structure. It is shown that the contact pressure distribution is singular at the edges of the contact region when the region is expanding with a speed which is higher than the wave speed in the structure. This type of phenomenon will occur in a number of structural collision problems in which one of the objects such as a cable or a thin plate is much more flexible than the other. Head injury problems represent a typical example
The solution for a very simple model of such a system, namely that of a rigid cylindrical impaclor striking an infinitely long string, is given in detail to illustrate the phenomenon.