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Jet ejecta mass upon oblique impactTheoretical models in the jetting regime for symmetric and asymmetric impact of thin plates predict the mass and velocity of jetted material upon oblique impact. However, experimental constraints on the amount of material which form jets upon oblique impact are not known. A series of preliminary experiments were conducted in which tungsten (W) flyer plates at speeds of 1.5 to 2.0 km/s were obliquely impacted into carbon targets at 30 deg in the regime of jetting, yielding radiation temperatures in the about 3200 K range. Both framing-camera and flash X-ray imaging were conducted. Broad cm-sized craters induced by jet ejecta on 2024 Al witness plates were used to infer jet mass. We infer, from measured witness plate crater volumes, that jet masses in the range of 0.01 to 0.06 g are produced by a 32 mm diameter, 6 mm thick W impactor. This is about one to two orders of magnitude less than those calculated from present theoretical models. In contrast, in refractory material experiments, the mass of gabbro ejecta trapped in styrofoam is 0.52 g, which is similar to that calculated.
Document ID
19930071608
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Yang, W.
(NASA Headquarters Washington, DC United States)
Ahrens, T. J.
(NASA Headquarters Washington, DC United States)
Miller, G. H.
(California Inst. of Technology Pasadena, United States)
Petach, M. B.
(TRW, Inc. Redondo Beach, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publisher: Elsevier Science Publishers
Subject Category
Lunar And Planetary Exploration
Accession Number
93A55605
Distribution Limits
Public
Copyright
Other

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