By Y. Horie
This booklet is the 1st of numerous volumes on solids within the surprise Wave technological know-how and know-how Reference Library. this can be a particular assortment, and the library as an entire units out to comprehensively and authoritatively disguise and overview at learn point the subject material with all its ramifications. the entire chapters are self-contained and will be learn independently of one another, although they're after all thematically interrelated.
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Sample text
These data agreed with existing theoretical models, which extrapolated to density compression ratios of about four at higher pressures [48]. However, Hugoniot data obtained with a laser-shock technique disagreed with these theoretical estimates and indicated substantially higher compressibility of ∼6-fold at pressures of 100–300 GPa [20, 21]. To help resolve this controversy, the magnetically accelerated flyer plate technique was used to obtain Hugoniot data for liquid deuterium using an impedance matching method [48, 52].
26. (a) Typical data obtained during a deuterium shock experiment, including VISAR (solid black line), FOSBO (solid gray line), and self-emission (dashed black line). (b) P – density compression Hugoniot data for deuterium (black diamonds). Also shown are data obtained from gas guns (open circles), lasers (open squares), and multi-stage explosive devices (gray circles) and theoretical models of Kerley (solid line), Ross (dot-dot-dashed line), and Desjarlais (dashed line) 34 Marcus D. Knudson the laser Hugoniot results, good agreement is achieved with data from the other experimental approaches and with the theories for deuterium mentioned above, with the exception of the Ross model.
The initial velocity increase (black line protion), over the first ∼75–100 ns of the launch, is the result of the driving pressure pulse reaching the free surface (impact surface) of the flyer plate. This wave interaction results in acceleration of the free surface and the propagation of a rarefaction wave back into the flyer plate. Thus, the peak velocity at the end of this stage of the launch provides a measure of the magnitude of the driving pressure pulse, and therefore the magnitude of the peak current at the load.
