Dynamic Plastic Deformation of Thin Cylindrical Shells under Internal Impulsive Pressure : 2nd Report, Experimental Investigation

概要

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This paper is concerned with an experimental investigation of plastic deformation of thin cylindrical shells under an internal impulsive pressure. The analytical [results developed in the 1st report are examined by the experiments in deformation of copper shells. By using a technique of exploding wires an axially uniform and symmetrical pressure pulse is generated which propagates radially through the water within the shell. In cases where the pressure pulse strikes the inner surface of shell wall must be taken into account the reflected pressure pulse due to the mismatch of the mass of shell with the mass of pressure pulse in water. In order to satisfy] the presuppositions used in the previous analyses, it is necessary that the magnitude of the reflected pressure pulse be made sufficiently small in comparison with that of the pressure pulse. The influences of the mass of shells on the reflected pressure pulse are discussed. The displacements of the shell walls are observed with an accuracy of the order of 10μsec by using an electronic camera. Reasonable agreements between the experimental results and the analytical results are obtained except near the reinforcing rings in the early stage of deformation.
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