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  • 1
    Electronic Resource
    Electronic Resource
    Nitroureas 1. Synthesis, scale-up and characterization of K-6 (1994)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 19 (1994), S. 232-239 
    Details
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The synthesis and characterization of 2-oxo-1,3,5-trinitro-1,3,5-triazacyclohexane (K-6), a cyclic dinitrourea, is described. The laboratory synthesis was scaled-up to provide 1.6 kilograms of crystalline K-6 which was used for performance testing. K-6 was formulated with 5% Viton A and pressed to 96.5% theoretical maximum density (TMD). Performance measurements in the form of front surface velocity measurements (tantalum plate push) and 1-inch cylinder expansion experiments indicate K-6 will out-perform HMX by 4% at early volume expansions. Thermal response and shock sensitivity experiments on K-6 are also described.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19940190504
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    Paper (German National Licenses)
    Fulltext
  • 2
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    High-performance fiber/epoxy composite pressure vessels (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Activities described include: (1) determining the applicability of an ultrahigh-strength graphite fiber to composite pressure vessels; (2) defining the fatigue performance of thin-titanium-lined, high-strength graphite/epoxy pressure vessel; (3) selecting epoxy resin systems suitable for filament winding; (4) studying the fatigue life potential of Kevlar 49/epoxy pressure vessels; and (5) developing polymer liners for composite pressure vessels. Kevlar 49/epoxy and graphite fiber/epoxy pressure vessels, 10.2 cm in diameter, some with aluminum liners and some with alternation layers of rubber and polymer were fabricated. To determine liner performance, vessels were subjected to gas permeation tests, fatigue cycling, and burst tests, measuring composite performance, fatigue life, and leak rates. Both the metal and the rubber/polymer liner performed well. Proportionately larger pressure vessels (20.3 and 38 cm in diameter) were made and subjected to the same tests. In these larger vessels, line leakage problems with both liners developed the causes of the leaks were identified and some solutions to such liner problems are recommended.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-CR-159512 , UCRL-52533
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Performance of filament-wound vessels from an organic fiber in several epoxy matrices (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A study was carried out to select a state-of-the-art epoxy for wet filament winding. Ten epoxy systems were used to filament wind pressure vessels with a high-modulus, high-strength organic fiber. Data are reported on vessel performance, fiber strand strengths, and shear strengths for the different systems. Using our criteria (processibility, neat resin properties, and vessel performance), we find that an epoxy system based on the rubber-modified bis-phenol-F resin, diluted with vinyl cyclohexane dioxide and cured with mixed aromatic amines, can easily replace bis-phenol-A epoxies diluted with bis-(2, 3-epoxycyclopentyl) ether (such as ERL 2256 epoxy of Union Carbide) with comparable overall performance.
    Keywords: NONMETALLIC MATERIALS
    Type: Materials review ''75; Oct 14, 1975 - Oct 16, 1975; Albuquerque, NM
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Polymer-lined filament-wound pressure vessels for nitrogen containment (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A program has been started to develop fatigue-resistant polymeric liners for a filament-wound pressure vessel to contain nitrogen gas at room temperature. First, nitrogen permeation of butyl rubber sheet coated with Saran and Parylene C was studied in flat specimens. Then four 10-cm-diam cylindrical pressure vessels were prepared with chlorobutyl rubber liners coated with the same materials. These vessels were valved off after nitrogen gas pressurization to approximately 65% of their expected failure pressure. One vessel leaked. The other three vessels showed an average pressure loss of less than 1% per month. These pressure vessels have an average performance factor of about 370 kPa x cu m/kg based on composite mass.
    Keywords: COMPOSITE MATERIALS
    Type: Failure modes in composites II; Symposium; May 19, 1974 - May 23, 1974; Pittsburgh, PA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Tensile properties of an ultrahigh-strength graphite fiber in an epoxy matrix (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The fiber performance and reinforcement potential for fiber composites of a special PAN-based graphite fiber were evaluated by testing the fiber's tensile properties in an epoxy matrix. Representative strand samples were taken from 30 spools of single-end, 1500-filament fiber to make over 5000 fiber/epoxy strand specimens using the filament-winding process. Characteristics studied were fiber uniformity, strength and modulus distributions at room and liquid-nitrogen temperatures, stress-strain behavior, the effect of strain rate on fiber strength, and acoustic emission during tensile loading to failure. The fiber was found to have a 3570-MPa failure stress, a 1.7% failure strain, a 206-GPa modulus, and a density of 1.77 Mg/cu m at 23 C. Liquid-nitrogen temperature and various strain rates had no significant effect on fiber tensile properties.
    Keywords: COMPOSITE MATERIALS
    Type: American Society for Testing and Materials, Composite Reliability Conference, Las Vegas; Apr 15, 1974 - Apr 16, 1974; Las vegas, NV
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Advanced technology for minimum weight pressure vessel system (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Bosses were made of fiber/resin composite materials to evaluate their potential in lightweight pressure vessels. An approximate 25% weight savings over the standard aluminum boss was achieved without boss failures during burst tests. Polymer liners and metal liners are used in fiber composite pressure vessels for containment of gases. The internal support of these liners required during the filament winding process has previously been provided by dissolvable salt mandrels. An internal pressurization technique has been developed which allows overwinding the liner without other means of support and without collapse. Study was made of several additional concepts including styrene/Saran, styrene/flexible epoxy.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-154833 , UCID-17399
    Format: application/pdf
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  • 7
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    Polymer-lined filament-wound pressure vessels for nitrogen containment (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A program has been started to develop fatigue-resistant polymeric liners for a filament-wound pressure vessel to contain nitrogen gas at room temperature. First, nitrogen permeation of butyl rubber sheet coated with Saran and Parylene C was studied in flat specimens. Then four 10-cm-diam cylindrical pressure vessels were prepared with chlorobutyl rubber liners coated with the same materials. These vessels were valved off after nitrogen gas pressurization to approximately 65% (approximately 11.7 MPa or 1700 psig) of their expected failure pressure. One vessel leaked. The other three vessels showed an average pressure loss of less than 1% per month. These pressure vessels have an average performance factor of approximately 370 kPa-cu m/kg (1,500,000 in.) based on composite mass.
    Keywords: STRUCTURAL MECHANICS
    Type: Spring Meeting; May 21, 1974 - May 22, 1974; Pittsburgh, PA
    Format: text
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  • 8
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    Screening of epoxy systems for high performance filament winding applications (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Several promising epoxy systems for high performance filament winding applications are described. Viscosities, gel times, and cast resin tensile behavior are given, as well as heat deflection under load and water absorption measurements.
    Keywords: NONMETALLIC MATERIALS
    Type: Materials review ''75; Oct 14, 1975 - Oct 16, 1975; Albuquerque, NM
    Format: text
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    NASA TECHNICAL REPORTS
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