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 language | English |
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Pages (from-to) | 4004-4011 |
Number of pages | 8 |
Journal | Journal of Applied Physics |
Volume | 83 |
Issue number | 8 |
DOIs | |
State | Published - 15 Apr 1998 |
ASJC Scopus subject areas
- General Physics and Astronomy