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Criterion of the incubation time in the problems of pulsed fracture and electric breakdown

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Abstract

The problems of a pulsed strength of continuum media are considered in terms of the structural-time approach that is based on the concept of the incubation fracture time. This approach makes it possible to describe phenomena that arise under high-velocity external effects. A limiting condition that determines the instant of rupture or breakdown is proposed on the basis of the structural-time approach. A way to interpret and to determine the incubation time is proposed. A phenomenological model of an electric breakdown of solid dielectrics is formulated. Examples are considered where the structural-time approach is applied to problems of spall fracture, crack initiation, and a pulsed breakdown of dielectrics. A procedure for describing the time dependence of the electric strength (volt-second characteristic) is described in detail. The results of the calculations are found to be in good agreement with experimental data.

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Authors and Affiliations

  1. St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 198904, Russia

    Yu. V. Petrov & P. A. Glebovskii

Authors
  1. Yu. V. Petrov
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  2. P. A. Glebovskii
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__________

Translated from Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 74, No. 11, 2004, pp. 53–57.

Original Russian Text Copyright © 2004 by Petrov, Glebovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \).

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Petrov, Y.V., Glebovskii, P.A. Criterion of the incubation time in the problems of pulsed fracture and electric breakdown. Tech. Phys. 49, 1447–1451 (2004). https://doi.org/10.1134/1.1826188

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  • DOI: https://doi.org/10.1134/1.1826188

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