Evolution of the elastoplastic bending of whisker crystals of NaCl due to nanosecond exposure to a high-density electron beam

Autor: A. A. Petrova, D. I. Vaisburd
Rok vydání: 1998
Předmět:
Zdroj: Russian Physics Journal. 41:1193-1197
ISSN: 1573-9228
1064-8887
Popis: High-speed photography is used to study the evolution of the plastic bending of whisker crystals (WCs) of NaCL caused by nanosecond exposure to a pulsed high-density electron beam. The total time of irreversible bending of a WC, reckoned from the radiation pulse to attainment of the quasisteady state, is equal to 1.5–2.5 msec and nearly coincides with the characteristic relaxation time of the quasistatic thermoelastic mechanical stresses that develop due to the nonuniform distribution of the dose and the corresponding temperature through the thickness of the specimen. These stresses relax when the temperature distribution is equalized by heat conduction. There is an induction period of 0.3–0.6 msec between the radiation pulse and the beginning of intensive bending, this period being much longer than the period of the thermoelastic bending vibrations. One interesting result of the study is that the bending is nonmonotonic.
Databáze: OpenAIRE
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