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  • 1
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    On the elastic properties of fiber composite laminates with statistically dispersed ply orientations (1972)
    In:  CASI
    Details
    Publication Date: 2006-02-22
    Description: Structural application of advanced composite filamentary materials requires lamination of the basic orthotropic plies into angle-ply laminates. The resulting elastic and strength properties depend on the pattern of orientation and are influenced by inevitable errors and inaccuracy in placement of the angle plies. Reviewed is the effect on elastic properties of orientation dispersion. The conventional constitutive relations are recast in a homologous form to account for orientation dispersion by addition of a single parameter. Graphical results are presented to show the behavior of the most important advanced composite materials. The results are directly useful for estimating effects of manufacturing inaccuracy and for design of partially oriented reinforced structures.
    Keywords: MATERIALS, NONMETALLIC
    Type: JPL Quart. Tech. Rev., Vol. 2, No. 2; p 48-60
    Format: text
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  • 2
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    A basic model for acoustic emission from fiber-reinforced material (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The first-order model of acoustic emission from fiber composites, based on filament breaking rates, is cast into a normalized form useful for correlating experimental data. The general features of the normalized model are shown.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-CR-128344 , JPL-TM-33-564
    Format: application/pdf
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  • 3
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    Analysis of stress-rupture data from S-glass composites. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Both composite and free strands have been tested to study matrix effectiveness. Glass from different lots were used, and processing parameters were varied to demonstrate the effects of material variability. The statistical patterns that emerge from these experiments show that lifetime distributions are characteristically skewed. As a class, the lifetime distributions are well approximated by the reduced form of the Weibull distribution. The strength retention data display little early degradation. The retained-strength distributions can also be classed as Weibull distributions. A statistical model applied to the data gives predictions of progressive failure, strength retention path, and expected life for two basic types of internal fracture processes.
    Keywords: MATERIALS, NONMETALLIC
    Type: Society of the Plastics Industry, Annual Conference; Feb 08, 1972 - Feb 11, 1972; Washington, DC
    Format: text
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  • 4
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    Estimating Weibull parameters for materials (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The statistical analysis of strength and fracture of materials in general, with application to fiber composites are discussed. The weakest link model is considered in a fairly general form, and the resulting equations are demonstrated by using a Weibull distribution for flaws. This distribution appears naturally in a variety of problems, and therefore additional attention is devoted to analysis and statistical estimation connected with this distribution. Special working charts are included to facilitate interpretation of observed data and estimation of parameters. Implications of the size effect are considered for various kinds of flaw distributions. Failure and damage in a fiber-reinforced system are described. Some useful graphs are included for predicting the strength of such a system. Recent data on organic-fiber (PRD 49) composite material is analyzed by the Weibull distribution with the methods presented.
    Keywords: MATERIALS, NONMETALLIC
    Type: JPL-TM-33-580 , NASA-CR-130725
    Format: application/pdf
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  • 5
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    A brief survey of carbon/carbon refractory composites at the Jet Propulsion Laboratory (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Refractory composites of carbon-carbon material are considered for application in: (a) rocket motor nozzles and skirts, (b) a unique integrated propulsion structure, and (c) planetary atmospheric entry shells. Technical developments and plans in each of these areas are described.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-CR-131745 , JPL-TM-33-579
    Format: application/pdf
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  • 6
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    Parameter Estimation for Compact Binary Coalescence Signals with the First Generation Gravitational-Wave Detector Network (2013)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Compact binary systems with neutron stars or black holes are one of the most promising sources for ground-based gravitational-wave detectors. Gravitational radiation encodes rich information about source physics; thus parameter estimation and model selection are crucial analysis steps for any detection candidate events. Detailed models of the anticipated waveforms enable inference on several parameters, such as component masses, spins, sky location and distance, that are essential for new astrophysical studies of these sources. However, accurate measurements of these parameters and discrimination of models describing the underlying physics are complicated by artifacts in the data, uncertainties in the waveform models and in the calibration of the detectors. Here we report such measurements on a selection of simulated signals added either in hardware or software to the data collected by the two LIGO instruments and the Virgo detector during their most recent joint science run, including a blind injection where the signal was not initially revealed to the collaboration. We exemplify the ability to extract information about the source physics on signals that cover the neutron-star and black-hole binary parameter space over the component mass range 1M25M and the full range of spin parameters. The cases reported in this study provide a snapshot of the status of parameter estimation in preparation for the operation of advanced detectors.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN12729 , Physical Review D (ISSN 2470-0010) (e-ISSN 2470-0029); 88; 062001
    Format: text
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  • 7
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    Developments of a unique graphite/epoxy antenna subreflector (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Advanced concepts for large, furlable space antennas have led to an extensive development program at the Jet Propulsion Laboratory (JPL) with configurations utilizing conical main reflectors. The antenna subreflectors for these conical configurations have unusual geometries and new structural requirements. Structural efficiency of the conical antennas is improved through the use of fiber composites. A subreflector was designed and fabricated with graphite/epoxy material. The subreflector is a cylindrical paraboloid with demanding criteria for contour surface precision, high thermal stability, and sufficient structural capacity for inertial launch loads in axial and transverse directions. The paper describes the design, analysis, and fabrication of the subreflector.
    Keywords: MATERIALS, NONMETALLIC
    Type: Conference on Composite materials: Testing and design; Mar 21, 1973 - Mar 22, 1973; Williamsburg, VA
    Format: text
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  • 8
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    Estimating Weibull parameters for composite materials. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper deals with the statistical analysis of strength and fracture of materials in general, with application to fiber composites. The 'weakest link' model is considered in a fairly general form, and the resulting equations are demonstrated by using a Weibull distribution for flaws. This distribution appears naturally in a variety of problems, and therefore additional attention is devoted to analysis and statistical estimation connected with this distribution. Special working charts are included to facilitate interpretation of observed data and estimation of parameters. Implications of the size effect are considered for various kinds of flaw distributions. The paper describes failure and damage in a fiber-reinforced systems.
    Keywords: MATERIALS, NONMETALLIC
    Type: Colloquium on Structural Reliability: The Impact of Advanced Materials on Engineering Design; Oct 09, 1972 - Oct 12, 1972; Pittsburgh, PA
    Format: text
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