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Dynamic Optical Investigations Of Hypervelocity Impact Damage
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Book Synopsis Dynamic Optical Investigations of Hypervelocity Impact Damage by : Leslie Elise Lamberson
Download or read book Dynamic Optical Investigations of Hypervelocity Impact Damage written by Leslie Elise Lamberson and published by . This book was released on 2010 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the prominent threats in the endeavor to develop next-generation space assets is the risk of space debris impact in earth's orbit and micrometeoroid impact damage in near-earth orbit and deep space. To date, there is no study available which concentrates on the analysis of dynamic crack growth from hypervelocity impacts on such structures, resulting in their eventual catastrophic degradation. Experiments conducted using a unique two-stage light-gas gun facility have examined the in situ dynamic fracture of brittle polymers subjected to this high-energy-density event. Optical techniques of caustics and photoelasticity, combined with high-speed photography up to 100 million frames per second, analyze crack growth behavior of Mylar and Homalite 100 thin plates after impact by a 1.8 mm diameter nylon 6-6 right cylindrical slug at velocities ranging from 3 to 7 km/s (7000-15500 mph). Crack speeds in both polymers averaged between 0.2 and 0.47 cR, the Rayleigh wave speed (450-1000 mph). Shadow spots and surrounding caustics reveal time histories of the dynamic stress intensity factor, as well as the energy release rate ahead of the mode-I, or opening, crack tips. Results indicate that even under extreme impact conditions of out of-plane loading, highly localized heating, and energetic impact phenomena involving plasma formation and ejecta, the dynamic fracture process occurs during a deformation regime dominated by in-plane loading. These findings imply that the reliability of impacted, thin-walled, plate and shell space structures, idealized by the experimental configuration investigated, can be predicted by the well defined principles of classical dynamic fracture mechanics.
Book Synopsis Dynamic Behavior of Materials, Volume 1 by : Tom Proulx
Download or read book Dynamic Behavior of Materials, Volume 1 written by Tom Proulx and published by Springer Science & Business Media. This book was released on 2011-03-31 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Behavior of Materials, Volume 1: Proceedings of the 2010 Annual Conference on Experimental and Applied Mechanics, the first volume of six from the Conference, brings together 71 contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Materials Science, including papers on Composite Materials, Dynamic Failure and Fracture, Dynamic Materials Response, Novel Testing Techniques, Low Impedance Materials, Metallic Materials, Response of Brittle Materials, Time Dependent Materials, High Strain Rate Testing of Biological and Soft Materials, Shock and High Pressure Response, Energetic Materials, Optical Techniques for Imaging High Strain Rate Material Response, and Modeling of Dynamic Response.
Book Synopsis Investigation of Optical Damage, Energy Partitioning and Scaling Laws at Extremely High Velocities by :
Download or read book Investigation of Optical Damage, Energy Partitioning and Scaling Laws at Extremely High Velocities written by and published by . This book was released on 1994 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical damage assessment is presented from analysis of retrieved space damaged material (solar cell arrays); results, show a peak in the space environment damage effects in millimetre region and a dominance by meteoroids in this region. Impact damage features on glass will be folded with the results of the energy partitioning which derive from the unique 2 MV Van de Graaff facility achieving (in this report) velocities of up to 42 km sec-1. Results from experimental campaigns incorporating simultaneous measurement of impact plasma, impact light flash and momentum enhancement provide new data on the fundamental features of energy partitioning in hypervelocity impacts phenomena such as ejecta momentum and kinetic energy, plasma and vapour production, and light flash energies. Hydrocode simulations are also described, which give insight into energy partitioning. Results from a study of the impact light flash are presented which have proven principles of the prototype chamber design. Results which complement the energy partitioning data obtained from the plasma studies show readily the sensitivity of this technique as a study tool on the Van de Graaff facility. (AN).
Book Synopsis Investigation of Hypervelocity Impact Phenomena Using Real-time Concurrent Diagnostics by : Jonathan Michael Mihaly
Download or read book Investigation of Hypervelocity Impact Phenomena Using Real-time Concurrent Diagnostics written by Jonathan Michael Mihaly and published by . This book was released on 2013 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hypervelocity impact of meteoroids and orbital debris poses a serious and growing threat to spacecraft. To study hypervelocity impact phenomena, a comprehensive ensemble of real-time concurrently operated diagnostics has been developed and implemented in the Small Particle Hypervelocity Impact Range (SPHIR) facility. This suite of simultaneously operated instrumentation provides multiple complementary measurements that facilitate the characterization of many impact phenomena in a single experiment. The investigation of hypervelocity impact phenomena described in this work focuses on normal impacts of 1.8 mm nylon 6/6 cylinder projectiles and variable thickness aluminum targets. The SPHIR facility two-stage light-gas gun is capable of routinely launching 5.5 mg nylon impactors to speeds of 5 to 7 km/s. Refinement of legacy SPHIR operation procedures and the investigation of first-stage pressure have improved the velocity performance of the facility, resulting in an increase in average impact velocity of at least 0.57 km/s. Results for the perforation area indicate the considered range of target thicknesses represent multiple regimes describing the non-monotonic scaling of target perforation with decreasing target thickness. The laser side-lighting (LSL) system has been developed to provide ultra-high-speed shadowgraph images of the impact event. This novel optical technique is demonstrated to characterize the propagation velocity and two-dimensional optical density of impact-generated debris clouds. Additionally, a debris capture system is located behind the target during every experiment to provide complementary information regarding the trajectory distribution and penetration depth of individual debris particles. The utilization of a coherent, collimated illumination source in the LSL system facilitates the simultaneous measurement of impact phenomena with near-IR and UV-vis spectrograph systems. Comparison of LSL images to concurrent IR results indicates two distinctly different phenomena. A high-speed, pressure-dependent IR-emitting cloud is observed in experiments to expand at velocities much higher than the debris and ejecta phenomena observed using the LSL system. In double-plate target configurations, this phenomena is observed to interact with the rear-wall several micro-seconds before the subsequent arrival of the debris cloud. Additionally, dimensional analysis presented by Whitham for blast waves is shown to describe the pressure-dependent radial expansion of the observed IR-emitting phenomena. Although this work focuses on a single hypervelocity impact configuration, the diagnostic capabilities and techniques described can be used with a wide variety of impactors, materials, and geometries to investigate any number of engineering and scientific problems.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1975 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
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Download or read book Impact Dynamics written by Jonas A. Zukas and published by . This book was released on 1982 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Brings together the various analytical and experimental aspects of impact dynamics, presenting a broad overview of the response of material and structures subjected to intense short-duration loading under conditions varying from low-speed to hypervelocity. Provides a fundamental approach to the methods and techniques of a number of engineering and applied physical disciplines, demonstrating their application to ballistics, high strain rate materials behavior, safe design of materials and structures, and intense, short-duration loading and dynamic failure.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781724243058 Total Pages :338 pages Book Rating :4.2/5 (43 download)
Book Synopsis Hypervelocity Impact Physics by : National Aeronautics and Space Administration (NASA)
Download or read book Hypervelocity Impact Physics written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-25 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: All large spacecraft are susceptible to impacts by meteoroids and orbiting space debris. These impacts occur at extremely high speed and can damage flight-critical systems, which can in turn lead to a catastrophic failure of the spacecraft. Therefore, the design of a spacecraft for a long-duration mission must take into account the possibility of such impacts and their effects on the spacecraft structure and on all of its exposed subsystems components. The work performed under the contract consisted of applied research on the effects of meteoroid/space debris impacts on candidate materials, design configurations, and support mechanisms of long term space vehicles. Hypervelocity impact mechanics was used to analyze the damage that occurs when a space vehicle is impacted by a micrometeoroid or a space debris particle. An impact analysis of over 500 test specimens was performed to generate by a hypervelocity impact damage database. Schonberg, William P. and Bean, Alan J. and Darzi, Kent Unspecified Center NASA-CR-4343, NAS 1.26:4343 NAS8-36955...
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Book Synopsis Research and Technology Program Digest by : United States. National Aeronautics and Space Administration
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Book Synopsis Government Reports Announcements & Index by :
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Book Synopsis Large Space Structures & Systems in the Space Station Era by :
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Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
