EXPERIMENTAL INVESTIGATION ON GENERATION MECHANISM OF EXPLOSIVE STRESS WAVES

１ＩＮＴＲＯＤＵＣＴＩＯＮＥｘｐｌｏｓｉｖｅｓｔｒｅｓｓｗａｖｅｓａｒｅｑｕｉｔｅｉｍｐｏｒｔａｎｔｉｎｒｏｃｋｆｒａｇｍｅｎｔａｔｉｏｎｐｒｏｃｅｓ．Ｍａｎｙｓｃｈｏｌａｒｓｈａｖｅｉｎｖｅｓｔｉｇａｔｅｄｔｈｅｇｅｎｅｒａｔｉｏｎａｎｄｐｒｏｐａ...

In order to investigate how shock energy (Es) and bubble energy (Eb) 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 radius r=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 Es and Eb 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 of Es and the latter is generated from dynamical loading of Eb against media surrounding a charge.