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  • LUNAR AND PLANETARY EXPLORATION  (2)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (2)
  • 1985-1989  (4)
  • 1
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    Experimental investigation of crater growth dynamics (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This work is a continuation of an ongoing program whose objective is to perform experiments and to develop scaling relationships for large-body impacts onto planetary surfaces. The centrifuge technique is used to provide experimental data for actual target materials of interest. With both power and gas guns mounted on the rotor arm, it is possible to match various dimensionless similarity parameters, which have been shown to govern the behavior of large-scale impacts. The development of the centrifuge technique has been poineered by the present investigators and is documented by numerous publications, the most recent of which are listed below. Understanding the dependence of crater size upon gravity has been shown to be key to the complete determination of the dynamic and kinematic behavior of crater formation as well as ejecta phenomena. Three unique time regimes in the formation of an impact crater have been identified.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-176392 , NAS 1.26:176392
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Space station integrated wall design and penetration damage control. Task 3: Theoretical analysis of penetration mechanics (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The efforts to provide a penetration code called PEN4 version 10 is documented for calculation of projectile and target states for the impact of 2024-T3 aluminum, R sub B 90 1018 steel projectiles and icy meteoroids onto 2024-T3 aluminum plates at impact velocities from 0 to 16 km/s. PEN4 determines whether a plate is perforated by calculating the state of fragmentation of projectile and first plate. Depth of penetration into the second to n sup th plate by fragments resulting from first plate perforation is determined by multiple cratering. The results from applications are given.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-179166 , NAS 1.26:179166 , D180-30550-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Centrifuge Impact Cratering Experiments (1985)
    In:  CASI
    Details
    Publication Date: 2014-10-08
    Description: The kinematics of crater growth, impact induced target flow fields and the generation of impact melt were determined. The feasibility of using scaling relationships for impact melt and crater dimensions to determine impactor size and velocity was studied. It is concluded that a coupling parameter determines both the quantity of melt and the crater dimensions for impact velocities greater than 10km/s. As a result impactor radius, a, or velocity, U cannot be determined individually, but only as a product in the form of a coupling parameter, delta U micron. The melt volume and crater volume scaling relations were applied to Brent crater. The transport of melt and the validity of the melt volume scaling relations are examined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984; p 167-169
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Simulation of the effects of the orbital debris environment on spacecraft (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: A remedy for the lack of a technique for testing the effects of orbital debris impacts has been sought along two paths at Boeing and elsewhere, firstly through the development of new launcher techniques capable of impact velocities between 8 and 16 km/s and secondly through the development of similitude techniques for modeling 8 to 16 km/s impacts using the present capabilities of projectile launchers. These two approaches are briefly discussed.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA, Goddard Space Flight Center, 15th Space Simulation Conference: Support the Highway to Space Through Testing; p 311
    Format: text
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    NASA TECHNICAL REPORTS
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