Abstract
Assumption concerning violation of the regime of continuous hydrodynamic penetration is justified using experimental data on the cumulative jet (CJ) penetration into a glass obstacle. It is established that the CJ penetration into glass has a jumplike character and consists of a primary hydrodynamic penetration stage, cavity collapse, and secondary penetration into the collapsed material. In the case of continuous CJ supply, this process is repeated over the penetration depth. Necessary conditions for the secondary penetration are (i) a high strength of the glass target and (ii) a high rate of fracture, which ensure spalling of the material and collapse of the cavity walls. The jumplike penetration ceases when a pressure release wave arrives at the primary penetration zone.
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Original Russian Text © B.V. Rumyantsev, 2008, published in Pis’ma v Zhurnal Tekhnicheskoĭ Fiziki, 2008, Vol. 34, No. 23, pp. 1–8.