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  • Other Sources  (6)
  • 1
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    Fracture mechanics of cellular glass (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The fracture mechanics of cellular glasses (for the structural substrate of mirrored glass for solar concentrator reflecting panels) are discussed. Commercial and developmental cellular glasses were tested and analyzed using standard testing techniques and models developed from linear fracture mechanics. Two models describing the fracture behavior of these materials were developed. Slow crack growth behavior in cellular glass was found to be more complex than that encountered in dense glasses or ceramics. The crack velocity was found to be strongly dependent upon water vapor transport to the tip of the moving crack. The existence of a static fatigue limit was not conclusively established, however, it is speculated that slow crack growth behavior in Region 1 may be slower, by orders of magnitude, than that found in dense glasses. Previously announced in STAR as N82-11209
    Keywords: NONMETALLIC MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Detection of strength limiting defects in cellular glasses by dielectric measurements (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The foamed glasses that are being considered for structural support in solar thermal energy system silvered glass concentrator mirrors are assessed for strength-limiting defects by a nondestructive technique which measures the capacitance of well defined regions. The feasibility of locating large defects is demonstrated for the case of one type of cellular mass. Observed capacitance variations are believed to be due to small voids or other irregularities in the material. If the defects are equal to or greater than approximately 20 times the glass matrix pore size, they can be resolved with sufficient accuracy to delineate their spatial extent.
    Keywords: NONMETALLIC MATERIALS
    Type: Journal of Nondestructive Evaluation; 2; June 198
    Format: text
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  • 3
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    Impact damage resistance of flat glass/cellular glass solar mirror experimental panels (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An attempt is made to characterize the hail-impact behavior of a solar concentrator structural material which consists of thin, second-surface silvered glass sheets bonded to structural support panels of cellular glass. The resulting glass/cellular glass panel can be described as a thin, brittle plate supported by an elastic foundation, with the adhesive bonding the two as a third component. The plate will bend during impact. Attention is experimentally given to how variations in the characteristics or geometry of the flat glass, adhesive and cellular glass affect hail-impact damage resistance. The critical energy needed to cause impact damage is calculated from the critical velocity of the iceball by means of the kinetic energy formula. The complexity of this structural system and the variability of the specimens render it impossible to completely develop an analytical treatment for the prediction of impact damage resistance.
    Keywords: COMPOSITE MATERIALS
    Format: text
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  • 4
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    Evaluation of Structural Cellular Glass (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Preliminary design information presented. First report discusses state of structural-cellular-glass programs as of June 1979. Second report gives further details of program to develop improved cellular glasses and to characterize properties of glasses and commercially available materials.
    Keywords: MATERIALS
    Type: NPO-15680 , NASA Tech Briefs (ISSN 0145-319X); 8; 1; P. 61
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  • 5
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    Fracture mechanics of cellular glass (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The fracture mechanics of cellular glasses (for the structural substrate of mirrored glass for solr concentrator reflecting panels) are discussed. Commercial and developmental cellular glasses were tested and analyzed using standard testing techniques and models developed from linear fracture mechanics. Two models describing the fracture behavior of these materials were developed. Slow crack growth behavior in cellular glass was found to be more complex than that encountered in dense glasses or ceramics. The crack velocity was found to be strongly dependent upon water vapor transport to the tip of the moving crack. The existence of a static fatigue limit was not conclusively established, however, it is speculated that slow crack growth behavior in Region 1 may be slower, by orders of magnitude, than that found in dense glasses.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-164959 , JPL-PUB-81-16
    Format: application/pdf
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  • 6
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    An investigation of the strength of aluminum wire used in integrated circuits (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Microloop pull test is developed to stress wire loops in situ until failure. The applied loads, the nature of the fracture, and its location are recorded. This test also stresses the wire bonds.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-11219
    Format: application/pdf
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