By J. Cinnamon
Whilst fabrics have interaction at hypervelocity - at the order of Mach 8.5 and above - unforeseen effects can ensue. This e-book addresses the results of hypervelocity impression, summarizing earlier and current study efforts in addition to taking off the theoretical beginning for figuring out fabric interactions at such pace. It makes a speciality of examine carried out on the Holloman Air strength Base excessive pace attempt song (HHSTT), that is operating towards a try out automobile velocity above March 10. Researchers have discovered that because the sled's velocity has elevated to Mach 8.5, a fabric interplay has constructed that motives 'gouging' within the rails and the sled's 'shoes' - which can result in catastrophic failure. the writer evaluates the HHSTT gouging phenomenon and gives ideas to mitigate the incidence of hypervelocity gouging. His insights and suggestions also will locate broad applicability in different parts, comparable to railguns, orbital particles, and weapon layout.
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Additional resources for Hypervelocity Gouging Impacts (Progress in Astronautics and Aeronautics)
The exact definition of hypervelocity and therefore the exact description of when this gouging phenomenon might occur is not a precise endeavor. However, as Laird reports, a widely accepted estimate is as the impact velocity approaches the order of magnitude of the elastic wave speed of the specific material gouging becomes more probable. 1) where E is the elastic modulus [which is the linear elastic slope of the equivalent uniaxial stress-strain (σ -ε) curve of the material] and ρ is the density of the material.
This indicates that extreme heating will be present in this analysis, whether the shoe is in contact with the rail or not. Based on the conduction analysis presented in Chapter 4, however, there is insufficient time for this generated heat to conduct into the rail. The shoe, on the other hand, can heat over the duration of a test run and can experience elevated temperatures. An examination of the effect of a heat shoe on a hypervelocity impact is examined in Chaper 9. Korkegi and Briggs developed an expression for gap pressure p as a function of the distance from the slipper leading edge x (see Fig.
They postulated that once this interaction began it could become self-sustaining and would continue until the back end of the shoe past the interacting region. (This matches the description proposed from the experimental work in Secs. ) They also noted the importance of the shock interaction within the gouging event. Barker et al. performed a parametric study on his model results to better quantify the contributions to gouging from various variables and to offer suggestions on gouge mitigation.