Simulation and experimental investigation of the spall fracture of 304L stainless steel irradiated by a nanosecond relativistic high-current electron beam

S. F. Gnyusov, V. P. Rotshtein, A. E. Mayer, V. V. Rostov, A. V. Gunin, K. V. Khishchenko, P. R. Levashov

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23 Citations (Scopus)

Abstract

The results of numerical and experimental investigations of the shock-wave induced spall fracture of bulk samples with thickness up to 10 mm made of 304L stainless steel irradiated by a nanosecond relativistic high-current electron beam with duration of (Formula presented.) 45 ns, electron energy of 1.35 MeV, and peak power density of (Formula presented.) are presented. By a mathematical model developed for numerical simulation of the shock-wave dynamics, it was found that a quasi-planar shock wave with duration of (Formula presented.) , and initial amplitude of 17 GPa was formed in the irradiated samples. The effects of orientation of (Formula presented.) -ferrite interlayers in the austenitic matrix relative to the shock wave direction on the spall fracture were experimentally investigated. It was found that spallation was carried out by mixed ductile–brittle fracture. For the transversal orientation of (Formula presented.) -ferrite, the contribution of a brittle fracture mode in the spallation is higher than that for the longitudinal orientation. In both cases, the spalled layer thickness increased almost linearly with the increase of the target thickness, which was in good agreement with literature data. By the comparison of experimental data with simulation results, it was revealed that the spall strength can be estimated as 6.1 GPa at strain rate (Formula presented.) and 3.4 GPa at strain rate 0.18 (Formula presented.) , for samples with the longitudinal and transversal orientation of (Formula presented.) -ferrites, respectively. The comparison of the obtained spall strength values with literature data is considered.

Original languageEnglish
Pages (from-to)59-70
Number of pages12
JournalInternational Journal of Fracture
Volume199
Issue number1
DOIs
Publication statusPublished - 1 May 2016

Keywords

  • High-current electron beam
  • Spall fracture
  • Stainless steel
  • δ-ferrite

ASJC Scopus subject areas

  • Mechanics of Materials
  • Computational Mechanics
  • Modelling and Simulation

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