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  • 1
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    Characterization of path effects on the properties of balloon films (1994)
    Elsevier
    Details
    Publication Date: 1994-02-01
    Print ISSN: 0273-1177
    Electronic ISSN: 1879-1948
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 2
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    Morphological characterization of selected balloon films and its effects on balloon performances (1994)
    Elsevier
    Details
    Publication Date: 1994-02-01
    Print ISSN: 0273-1177
    Electronic ISSN: 1879-1948
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 3
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    Overview of the development of the pathfinder ultra-long duration balloon system (2004)
    Elsevier
    Details
    Publication Date: 2004-01-01
    Print ISSN: 0273-1177
    Electronic ISSN: 1879-1948
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 4
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    Special considerations for qualifying thin films for super pressure pumpkin ultra long duration balloon missions (2004)
    Elsevier
    Details
    Publication Date: 2004-01-01
    Print ISSN: 0273-1177
    Electronic ISSN: 1879-1948
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 5
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    Morphological characterization of selected balloon films and its effects on balloon performances (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Morphological characterization of several polyethylene balloon films have been studied using various techniques. The objective is to determine, if any, differentiating structural or morphological features that can be related to the performance of these balloon film materials. The results of the study indicate that the films are composed of either linear low denstiy polyethylene (LLDPE) or low density polyethylene (LDPE). A selective examination of these data imply that films limited degree of branching and larger crystallites size (same % crystallinity) showed good mechanical properties that appear to correlate with their high level of success in balloon flights.
    Keywords: NONMETALLIC MATERIALS
    Type: Advances in Space Research (ISSN 0273-1177); 14; 2; p. (2)31-(2)34
    Format: text
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  • 6
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    Characterization of path effects on the properties of balloon films (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The effect of stress and temperature path on the mechanical properties of a balloon film material (Astrofilm E2) have been studied using two techniques. The first technique is based on uniaxial tensile measurements of prestrained strips of the film as a function of temperature. Data are analyzed in terms of two temperature coefficients, defined here as a stiffness coefficient and a strength coefficient; and by comparing the areas under the stress-strain curves. The second technique investigated the effect of stress and temperature path on inflated cylinders of the same material. The changes in the mechanical properties due to preconditioning in the biaxial stress state were evaluated using the ball burst test. Preliminary findings indicate that the material is stress and temperature path dependent. Changes in stiffness coefficient, draw strength and toughness were measured and discussed. The above techniques may be suitable to document path dependent changes, and to discriminate among films of different manufacture.
    Keywords: NONMETALLIC MATERIALS
    Type: Advances in Space Research (ISSN 0273-1177); 14; 2; p. (2)27-(2)30
    Format: text
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  • 7
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    Giant Vehicles (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: Science and technology development from balloon-borne telescopes and experiments is a rich return on a relatively modest involvement of NASA resources. For the past three decades, the development of increasingly competitive and complex science payloads and observational programs from high altitude balloon-borne platforms has yielded significant scientific discoveries. The success and capabilities of scientific balloons are closely related to advancements in the textile and plastic industries. This paper will present an overview of scientific balloons as a viable and economical platform for transporting large telescopes and scientific instruments to the upper atmosphere to conduct scientific missions. Additionally, the paper sheds the light on the problems associated with UV degradation of high performance textile components that are used to support the payload of the balloon and proposes future research to reduce/eliminate Ultra Violet (UV) degradation in order to conduct long-term scientific missions.
    Keywords: Engineering (General)
    Format: application/pdf
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  • 8
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    Recent Progress in Materials Selection and Characterizations for Ultra Long Duration Balloon (ULDB) Missions (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The development and characterization of materials suitable for ultra long duration balloon flights has recently been the focus of the materials R&D efforts for the NASA balloon program. Although basic materials selection criteria is similar to those used for conventional balloon missions, additional considerations related to balloon design, fabrication, durability, environmental effects, and cost must also be considered. Among these, the highest impact on material selection is, related to the design shape of the balloon. Work done by independent researchers indicate that for pumpkin type balloons, the load-carrying member is the tendon rather than the structural envelope. This in turn lowers the strength requirements on the envelope material to a large extent. Several materials and material combinations were explored for both design systems. This paper will present the progress made to date in the selection and characterization of these materials and the technical challenges remaining to be overcome,
    Keywords: Chemistry and Materials (General)
    Type: COSPAR2000; Jan 01, 2000; Warsaw,; Poland
    Format: text
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  • 9
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    Mechanical Behavior of Fabric-Film Laminates (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Inflatable structures are gaining wide support in planetary scientific missions as well as commercial applications. For such applications a new class of materials made of laminating thin homogenous films to lightweight fabrics are being considered us structura1 gas envelops. The emerging composite materials are a result of recent advances in the manufacturing cf 1ightweight, high strength fibers, fabrics and scrims. The lamination of these load-carrying members with the proper gas barrier film results in wide range of materials suitable for various loading and environmental conditions. Polyester - based woven fabrics laminated to thin homogeneus film of polyester (Maylar) is an example of this class. This fabric/ film laminate is being considered for the development a material suitable for building large gas envelopes for use in the NASA Ultra Long Duration Balloon Program (ULDB). Compared to commercial homogeneus films, the material provides relatively high strength to weight ratio as well as better resistance to crack and tear propagation. The purpose of this papers is to introduce the mechanical behavior of this class of multi-layers composite and to highlight some of the concerns observed during the characterization of these laminate composites.
    Keywords: Composite Materials
    Type: ANTEC99; May 02, 1999 - May 06, 1999; New York, NY; United States
    Format: application/pdf
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  • 10
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    Mechanical and Tear Properties of Fabric/Film Laminates (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Films reinforced with woven fabrics are being considered for the development of a material suitable for long duration scientific balloons under a program managed by the National Aeronautics and Space Administration (NASA). Recently developed woven fabrics provide a relatively high strength to weight ratio compared to standard homogenous films. Woven fabrics also have better crack propagation resistance and rip stop capabilities when compared to homogenous lightweight, high strength polymeric films such as polyester and nylon. If joining is required, such as in the case of scientific balloons, woven fabrics have the advantage over polymeric thin films to utilize traditional textile methods as well as other techniques including hot sealing, adhesion, and ultrasonic means. Woven fabrics, however, lack the barrier properties required for helium filled scientific balloons, therefore lamination with homogenous films is required to provide the gas barrier capabilities required in these applications.
    Keywords: Composite Materials
    Type: Composite Materials; Jul 05, 1998 - Jul 11, 1998; Las Vegas, NV; United States
    Format: application/pdf
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