An increase of the spall strength in aluminum, copper, and Metglas at strain rates larger than 107 s-1

E. Moshe, S. Eliezer, E. Dekel, A. Ludmirsky, Z. Henis, M. Werdiger, I. B. Goldberg, N. Eliaz, D. Eliezer

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120 Scopus citations

Abstract

Measurements of the dynamic spall strength in aluminum, copper, and Metglas shocked by a high-power laser to hundreds of kilobars pressure are reported. The strain rates in these experiments are of the order of 107 s-1, which cannot be reached in impact experiments. The free-surface velocity behavior associated with spallation is characterized by oscillations caused by the reverberations of the spall layer. An optically recording velocity interferometer system was developed to measure the free-surface velocity time history. This diagnostic method has the advantages of being a noninterfering system and produces a highly accurate continuous measurement in time. The spall strength was calculated from the free-surface velocity as a function of the strain rate. The results show a rapid increase in the spall strength, suggesting that a critical phenomenon occurs at strain rates ∼ 107 s-1, expressed by the sudden approach to the theoretical value of the spall strength.

Original languageEnglish
Pages (from-to)4004-4011
Number of pages8
JournalJournal of Applied Physics
Volume83
Issue number8
DOIs
StatePublished - 15 Apr 1998

ASJC Scopus subject areas

  • General Physics and Astronomy

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