Abstract:In order to investigate how shock energy (E_s) and bubble energy (E_b) play role in the generation of explosive stress waves, instrumented tests were conducted in concrete models with explosion loading of different column charges containing RDX. Experimental results showed that, as a coupling charge was exploded, the transducer, embedded in model at a relative radiusr=20, sequentially recorded two different radial stress waves; the former consisted of a compressive phase and a tensile phase, and the latter had only a compressive phase; the lasting time of the former was much less than that of the latter, but the compressive stress peak of the former was greater than that of the latter. The relation between the loading of both E_s and E_b against media surrounding a charge and the generation of explosive stress waves have been investigated. It was pointed out that the former is generated from impact ofEsand the latter is generated from dynamical loading of Ebagainst media surrounding a charge.

Key words: generation mechanism of explosive stress waves　shock energy　bubble energy