| Design and Test Results of an Advanced Liquid Hydrogen Turbopump |
15 JUN 1999 |
14 pages |
| Authors:
G. Crease; R. Lyda; J. Park; A. Minick; AIR FORCE RESEARCH LAB EDWARDS AFB CA
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 | This paper discusses the design, the test facility, and the test results of an Advanced Liquid Hydrogen Turbopump for a 30,000 pound (22,679 kg) thrust Upper Stage Expander Cycle Engine being developed by Pratt & Whitney Liquid Space Propulsion under contract for the United States Air Force Research Laboratory (AFRL) to support the Integrated High Payoff Rocket Technology (IHPRPT) program. The Advanced Liquid Hydrogen Turbopump is designed to provide improved ... |
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| Molecular Control of Liquid Crystalline Orientation of Poly(p-phenylene- 2,6-benzobisoxazole) and Poly(p-phenylene-2,6-benzobisthiazole) |
30 NOV 92 |
4 pages |
| Authors:
Issifu I. Harruna; Malcom B. Polk; B. Khamvongsa; A. Thuo; J. Park; MORRIS BROWN COLL ATLANTA GA DEPT OF CHEMISTRY
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| We studied the effect of molecular orientation on the transverse mechanical properties of poly(p-phenylene-2,6 benzobisoxazole) (PBO) and poly(2, 5-benzoxazole) (ABPBO). We prepared ABPBO and PBO chains with radially shaped chain orientations with respect to the anthrone nucleus. The inherent viscosity of the ABPBO in methene-sulfonic acid at 20 deg C was 0.98 dL/g. The C-13 FT NMR spectrum of the star-like polymer showed a chemical shift at 75.0 ppm (relative ... |
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| Forming of Near Net Shapes of Titanium Alloys by Blended Elemental Powder Metallurgy |
DEC 84 |
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| Authors:
J. Park; M. W. Toaz; D. H. Ro; E. N. Aqua
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 | A new full dense blended elemental powder metallurgy (P/M) process developed for titanium alloys has been demonstrated as one approach to produce near-net-shapes, providing substantial increases in material utilization, concurrent reductions in machining costs, and satisfactory static properties. Microstructure and properties as a result of the process and applications are described and illustrated in this article. |
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| Application of the HARDMAN Methodology to the Single Channel Ground- Airborne Radio System (SINCGARS) |
DEC 1984 |
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| Authors:
J. Balcom; J. Park; L. Toomer; T. Feng; DYNAMICS RESEARCH CORP WILMINGTON MA
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| The HARDMAN methodology is designed to assess the human resource requirements early in the weapon system acquisition process. In this case, the methodology was applied to the family of radios known as SINCGARS (Single Channel Ground-Airborne Radio System). At the time of the study, SINCGARS was approaching the Full-Scale Development phase, with 2 contractors in competition. Their proposed systems were compared with a composite baseline comparison (reference) system. The systems' ... |
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| Blended Elemental Powder Metallurgy of Titanium Alloys, |
1984 |
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| Authors:
J. Park; M. W. Toaz; D. H. Ro; E. N. Aqua; IMPERIAL CLEVITE INC CLEVELAND OH
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| As a result of a new blended elemental P/M process developed for titanium alloys, a sintered density of 99%+ of theoretical was achieved in the Ti-6Al-4V alloy with as-sintered microstructures of equiaxed alpha, or a unique mixture of equiaxed alpha with occasional Widmanstatten alpha. Sintered density increased with increasing green density and sintering temperature. Tensile and fatigue properties are strongly dependent on the sintered density. Tensile properties and fatigue strength ... |
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| A COMPILATION OF OUTGASSING DATA FOR SPACECRAFT MATERIALS. |
SEP 73 |
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| Authors:
W. Campbell; R. Marriott; J. Park; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIGHT CENTER
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| Outgassing data, consisting of percentage weight loss and percentage volatile condensable materials, have been compiled from results obtained at Goddard Space Flight Center and at Stanford Research Institute. The data are assembled categorically and alphabetically to aid materials engineers, designers, and manufacturers in selecting materials with low outgassing properties. (Author-PL) ANNOTATION: A compilation of outgassing data for spacecraft materials. |
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