By Lee Davison (auth.), Yasuyuki Horie, Lee Davison, Naresh N. Thadhani (eds.)
Both experimental and theoretical investigations make it transparent that mesoscale fabrics, that's, fabrics at scales intermediate among atomic and bulk subject, don't regularly behave in methods estimated by means of traditional theories of outrage compression. At those scales, surprise waves have interaction with neighborhood fabric homes and microstructure to provide a hierarchy of dissipative constructions similar to inelastic deformation fields, randomly disbursed lattice defects, and residual stresses. A macroscopically regular planar surprise wave is neither aircraft nor regular on the mesoscale.
The chapters during this e-book study the assumptions underlying our realizing of concern phenomena and current new measurements, calculations, and theories that problem those assumptions. They tackle such questions as:
- What are the experimental facts on mesoscale results of shocks, and what are the results?
- Can one formulate new mesoscale theories of concern dynamics?
- How may new mesoscale theories have an effect on our knowing of shock-induced part transitions or fracture?
- What new computational versions could be wanted for investigating mesoscale shocks?
Read or Download High-Pressure Shock Compression of Solids VI: Old Paradigms and New Challenges PDF
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Extra resources for High-Pressure Shock Compression of Solids VI: Old Paradigms and New Challenges
Sample text
State 2, in the material between the reflected and transmitted shocks, lies at the intersection of this Hugoniot and the principal Hugoniot for the copper, as shown in Fig. 8b. It is important to note that the reflected disturbance is compressive. If the second copper plate were replaced by one of a material having an Hugoniot lying below that of the aluminum alloy, the reflected disturbance would be a decompression wave. 2. Many other cases of shock interaction Witll interfaces or other shocks arise; all are analyzed in a manner similar to tllat illustrated in tile preceding examples.
52 Lee Davison similar to that of fluids. Since the theory of compressible fluid behavior was well developed, much of the early research activity was directed toward experimental characterization of the response of solids to strong shock compression [8). The discovery of new phenomena in the course of this early experimental work motivated development of both more refined experimental observations and more comprehensive theoretical descriptions of material response. This work was very successful and continues to this day.
The diagram is drawn for the case in wrnch a copper projectile plate I-nun thick and moving at 1000 m/s impacts a stationary copper target. +=x+/Us. 121) When the receding shock encounters the stress-free back surface of the projectile plate, a centered simple decompression wave forms and propagates forward. Because the soundspeed in the compressed material behind the advancing shock exceeds the shock velocity, the smooth wave will eventually overtake the shock. 123) Because the overtaking wave is one of decompression, we expect that tIle interaction will cause a decrease in shock strength and velocity.