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Title	Formation and behavior of shock waves in solids
Publication Type	thesis
School or College	College of Engineering
Department	Metallurgy
Author	Clay, Robert Blaine
Date	1960
Description	Shock Propagation in Solids A mechanism is proposed which relates the roles of elastic, plastic, unstable shock and stable shock waves in elastic-plastic solids. The model is based upon extending the equation for the long-tiadinil acoustic velocity for solids into the plastic region as portrayed by the stress-strain curves for the bulk and shear moduli. The explanation is qualitative but agrees in principle with experimental results observed. A study was made concerning some of the various effects of shocks passing through transparent solids. Explosives were the primary shock source, while the resulting shocks passing through the specimens were observed photographically by either a streak camera or a high speed framing camera. Specifically the transparent specimen was placed between the camera and an intense parallel or diffuse light source, and the change in index of refraction of the specimen by the shock produced recordable images. The results were of necessity rather qualitative. Nevertheless somewhat detailed studies were made concerning explosive end impulse, explosive lateral impulse, shock behavior at a free surface, shock behavior at a solid-solid interface, shock velocity attenuation and free surface velocities. Shock Wave Initiation of Cast Explosives Through Inert Barriers Detonations in donor charges interrupted by inert barriers reformed in receptor changes in the time 1 and at distances S2 into receptor charges such that S2/t was approximately the acoustic velocity CL in the non-reacte4 explosive. But when the charge length was less than S2, no initiation occurred with unconfined receptors. However, with metals of high impedance on the terminal end of a receptor of length Lr such that 0.5 S2 < Lr < S2 the initiation occurred at the distance X = 2Lr - S2 from the donor-receptor barrier plate. Furthermore,
Type	Text
Publisher	University of Utah
Dissertation Name	Doctor of Philosophy
Language	eng
Rights Management	© Robert Blaine Clay
Format	application/pdf
Format Medium	application/pdf
ARK	ark:/87278/s6cya7pr
Setname	ir_etd
ID	2252883
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6cya7pr

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Title	Page 38
Format	application/pdf
Setname	ir_etd
ID	2252921
OCR Text	Show 26 attenuated until the intensity plastic flow of plexiglas, free surface the terminal shock as a but sufficient The purpose qf the steel 0 pressure as shown in Figure 15 reles,e a are plexiglas adjacentl plate 'which covered reflect the inttia1. to was one;""half contrasted to the free surface reflecting as wave produce spalling of the to plexiglas block surface of the the initial shock The reduced below that necessary for was tension or The results also wave!' in qualitative 'Agreement with e.quati.on' (8b) to the free surface while the high spalled, I 0 impedance plate prevented spalling. ';rhe reflected graphs while the re1Fase front appear s dark corresponding than the background which r ef'Lec red causes it to the on original photo pressure front is aPl>ear lighter ahead of the be to ... release front. The effec t of the nar-row air gap at the solid solid interface ... - 'ox Figure '14 prompted a transmitting medium It intima,te1y sandwiched between study was to observe the effect of thickness of decided that pl.exf g Las oQse,rv'ation of the shock behavior j, A a highly mismatched impe4anc blocks would allow diagram of a photographic typical "sandwich" chage is shown .in ,Figure 16.1' 3" x'l" plexiglas (sq) Brass Figure 16: a plate 3" (sq) U' (d) X X 2" plexiglas 2" pentolite of components to observe shock behavior v thi,ckness of mismatched impedance, Arrangement p;
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6cya7pr/2252921