REVIEWED BY WILLIAM PRAGER 1THIS IS AN excellent exposition of the mathematical theory of plasticity and its applications to engineering problems in which the plastic strains may be treated as infinitesimal. Accordingly, it is exclusively concerned with the mechanical behavior of structures and machine parts just beyond the elastic range; no applications of plasticity theory to technological forming processes are discussed.

A shock tube with an implosive jet driver has been investigated both theoretically and experimentally. The implosive driver consists of a cylinder of high explosive that progressively implodes the glass walls of a shock tube and projects a diffuse jet of glass particles into the shock tube. A tentative theory of the implosion process and jet formation is presented and compared with experimental data. It is shown that the jet of glass particles has an initial velocity equal to twice the detonation velocity of the explosive, and that the diffuse jet acts like a solid piston when the Reynolds number of the glass particles is less than unity.

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