Remember Me
Or use your Academic/Social account:


Or use your Academic/Social account:


You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.


Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message


Verify Password:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Mihaly, Jonathan M.; Tandy, Jonathan D.; Rosakis, A. J.; Adams, M. A.; Pullin, D.
Publisher: American Society Mechanical Engineers
Languages: English
Types: Article
Subjects: dewey620, dewey530
A series of hypervelocity impact experiments were conducted with variable target chamber atmospheric pressure ranging from 0.9 to 21.5 Torr. Using a two-stage light-gas gun, 5.7 mg nylon 6/6 right-cylinders were accelerated to speeds ranging between 6.0 and 6.3 km/s to impact 1.5 mm thick 6061-T6 aluminum plates. Full-field images of near-IR emission (0.9 to 1.7 μm) were measured using a high-speed spectrograph system with image exposure times of 1 μs. The radial expansion of an IR-emitting impact-generated phenomenon was observed to be dependent upon the ambient target chamber atmospheric pressures. Higher chamber pressures demonstrated lower radial expansions of the subsequently measured IR-emitting region uprange of the target. Dimensional analysis, originally presented by Taylor to describe the expansion of a hemispherical blast wave, is applied to describe the observed pressure-dependence of the IR-emitting cloud expansion. Experimental results are used to empirically determine two dimensionless constants for the analysis. The maximum radial expansion of the observed IR-emitting cloud is described by the Taylor blast-wave theory, with experimental results demonstrating the characteristic nonlinear dependence on atmospheric pressure. Furthermore, the edges of the measured IR-emitting clouds are observed to expand at extreme speeds ranging from approximately 13 to 39 km/s. In each experiment, impact ejecta and debris are simultaneously observed in the visible range using an ultrahigh-speed laser shadowgraph system. For the considered experiments, ejecta and debris speeds are measured between 0.6 and 5.1 km/s. Such a disparity in observed phenomena velocities suggests the IR-emitting cloud is a distinctly different phenomenon to both the uprange ejecta and downrange debris generated during a hypervelocity impact.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • [1] Mihaly, J. M., Tandy, J. D., Adams, M. A., and Rosakis, A. J., 2013, “In Situ Diagnostics for a Small-Bore Hypervelocity Impact Facility,” Int. J. Impact Eng., 62, pp. 13-26.
    • [2] Christiansen, E., 2009, Handbook for Designing MMOD Protection, NASA, Washington, DC, Technical Memorandum No. TM-2009-214785.
    • [3] Taylor, G. I., 1950, “The Formation of a Blast Wave by a Very Intense Explosion. I. Theoretical Discussion,” Proc. R. Soc. Lond. Ser. A, 201(1065), pp. 159-174.
    • [4] Piekutowski, A. J., and Poorman, K. L., 2013, “Effects of Scale on the Performance of Whipple Shields for Impact Velocities Ranging From 7 to 10 km/s,” Procedia Engin., 58, pp. 642-652.
    • [5] Schultz, P. H., Adams, M. A., Perry, J. W., Goguen, J. D., and Sugita, S., 1996, “Impact Flash Spectroscopy,” 27th Lunar and Planetary Science Conference (LPSC 96), Houston, TX, Mar. 18-22, Paper No. 1575.
    • [6] Sugita, S., Schultz, P., and Adams, M., 1997, “In Situ Temperature Measurements of Impact-Induced Vapor Clouds With a Spectroscopic Method,” 28th Lunar and Planetary Science Conference (LPSC 97), Houston, TX, Mar. 17-21, pp. 1149-1150, Paper No. 1306, available at: http://www.lpi.usra.edu/meetings/ lpsc97/pdf/1306.PDF
    • [7] Sugita, S., and Schultz, P., 1998, “Spectroscopic Observation of Atmospheric Interaction of Impact Vapor Clouds,” 29th Lunar and Planetary Science Conference (LPSC 98), Houston, TX, Mar. 16-20, Paper No. 1751, available at: http:// www.lpi.usra.edu/meetings/LPSC98/pdf/1751.pdf
    • [8] Sugita, S., and Schultz, P., 2000, “Spectroscopic Observation of Chemical Interaction Between Impact-Induced Vapor Clouds and the Ambient Atmosphere,” 31st Lunar and Planetary Science Conference (LPSC 2000), Houston, TX, Mar. 13-17, Paper No. 2029, available at: http://www.lpi.usra.edu/meetings/lpsc2000/pdf/2029.pdf
    • [9] Sugita, S., and Schultz, P. H., 2003, “Interactions Between Impact-Induced Vapor Clouds and the Ambient Atmosphere: 1. Spectroscopic Observations Using Diatomic Molecular Emission,” J. Geophys. Res., 108(E6), p. 5051.
    • [10] Adams, M., Lashgari, A., Li, B., McKerns, M., Mihaly, J., Ortiz, M., Owhadi, H., Rosakis, A., Stalzer, M., and Sullivan, T., 2012, “Rigorous Model-Based Uncertainty Quantification With Application to Terminal Ballistics, Part II. Systems With Uncontrollable Inputs and Large Scatter,” J. Mech. Phys. Solids, 60(5), pp. 1002-1019.
    • [11] Kamga, P. H. T., Li, B., McKerns, M., Nguyen, L. H., Ortiz, M., Owhadi, H., and Sullivan, T. J., 2014, “Optimal Uncertainty Quantification With Model Uncertainty and Legacy Data,” J. Mech. Phys. Solids, 72, pp. 1-19.
    • [12] Mihaly, J. M., Rosakis, A. J., Adams, M., and Tandy, J., 2013, “Imaging Ejecta and Debris Cloud Behavior Using Laser Side-Lighting,” Procedia Engineering, 58, pp. 363-368.
    • [13] Whitham, G. B., 1974, Linear and Nonlinear Waves, Wiley, New York.
    • [14] Liepmann, H. W., and Roshko, A., 1957, Elements of Gas Dynamics, Courier Dover Publications, Mineola, NY.
    • [15] Tandy, J. D., Mihaly, J. M., Adams, M. A., and Rosakis, A. J., 2014, “Examining the Temporal Evolution of Hypervelocity Impact Phenomena Via High-Speed Imaging and Ultraviolet-Visible Emission Spectroscopy,” J. Appl. Phys., 116(3), p. 034901.
    • [16] Sugita, S., and Schultz, P. H., 2003, “Interactions Between Impact-Induced Vapor Clouds and the Ambient Atmosphere: 2. Theoretical Modeling,” J. Geophys. Res., 108(E6), p, 5052.
    • [17] Lee, N., Close, S., Lauben, D., Linscott, I., Goel, A., Johnson, T., Yee, J., Fletcher, A., Srama, R., Bugiel, S., Mocker, A., Colestock, P., and Green, S., 2012, “Measurements of Freely-Expanding Plasma From Hypervelocity Impacts,” Int. J. Impact Eng., 44, pp. 40-49.
  • No related research data.
  • Discovered through pilot similarity algorithms. Send us your feedback.

Share - Bookmark

Cite this article