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  • 1
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    Analysis and correlation of thermodynamic cycles for space applications (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Analysis and correlation of thermodynamic cycles for spacecraft power systems using maximum cycle irreversibility concept and second law of thermodynamics
    Keywords: THERMODYNAMICS AND COMBUSTION
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  • 2
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    The radiobiological consequences of dose distributions produced by solar-flare-type spectra (1965)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Radiobiological results of dose distribution from solar flare radiation - radiation effects
    Keywords: BIOSCIENCES
    Format: text
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  • 3
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    Analytical/experimental correlations of failure modes in composites (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: During the past decade, significant progress has been made in the development and refinement of finite element micromechanics analyses of unidirectional composite materials. The current status is summarized here, and example results are presented. These are correlated with available experimental data, and with scanning electron microscope observations.
    Keywords: COMPOSITE MATERIALS
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  • 4
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    Micromechanical predictions of crack initiation, propagation and crack growth resistance in boron/aluminum composites (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An elastoplastic, axisymmetric finite element model has been used to predict the initiation and propagation of a crack in a composite model consisting of a single broken boron fiber embedded in an annular sheath of aluminum matrix. The accuracy of the axisymmetric finite element model for crack problems has been established by solving the classical problem of a penny-shaped crack in a thick cylindrical rod under axial tension. Also, the stress intensity factors predicted by the present numerical model are compared with continuum results. A constant displacement boundary condition applied during an increment of crack growth permits a substantial amount of stable crack growth in the matrix material. The concept of Crack Growth Resistance Curves (KR-curves) has been used to determine the point of crack instability
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Composite Materials; 16; Nov. 198
    Format: text
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  • 5
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    Design and testing of high-pressure railguns and projectiles (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Attention is given to the results of high-pressure tests involving four railgun designs and four projectile types. Explosive magnetic-flux compression generators were employed to power the railguns. On the basis of the experimental data, it appears that the high-strength projectiles have lower resistance to acceleration than low-strength projectiles, which expand against the bore during acceleration. While confined in the bore, polycarbonate projectiles can be subjected to pressures as high as 1.3 GPa without shattering. In multishot railguns, it is important to prevent an accumulation of sooty material from the plasma armature in railgun seams.
    Keywords: ENGINEERING (GENERAL)
    Type: IEEE Transactions on Magnetics (ISSN 0018-9464); MAG-20; 252-255
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  • 6
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    Evaluation of a stall-flutter spring-damper pushrod in the rotating control system of a CH-54B helicopter (1974)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Results of a design and flight test program conducted to define the effect of rotating pushrod damping on stall-flutter induced control loads are presented. The CH-54B helicopter was chosen as the test aircraft because it exhibited stall induced control loads. Damping was introduced into the CH-54B control system by replacing the standard pushrod with spring-damper assemblies. Design features of the spring-damper are described and the results of a dynamic analysis are shown which define the pushrod stiffness and damping requirements. Flight test measurements taken at 47,000 lb gross weight with and without the damper are presented. The results indicate that the spring-damper pushrods reduced high frequency, stall-induced rotating control loads by almost 50%. Fixed system control loads were reduced by 40%. Handling qualities in stall were unchanged, as expected.
    Keywords: AIRCRAFT
    Type: NASA. Ames Res. Center Rotorcraft Dyn.; p 223-232
    Format: application/pdf
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  • 7
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    Mission: PHH2O (1989)
    In:  CASI
    Details
    Publication Date: 2017-03-17
    Description: The purpose of this project was to design a mission and a spacecraft capable of retrieving 120,000 kg of water from Phobos, a martian moon. There were no restrictions on the types of propulsion or power systems used. The duration of the mission was not defined, but a factor influencing the length of the mission was the statement that it would be cyclic in nature and the spacecraft could be manned or unmanned. The only assumptions provided were that a pumping and refueling station existed on Phobos and that a base existed on the Moon. The technology used for this mission was to be of the year 2007 and beyond.
    Keywords: SYSTEMS ANALYSIS
    Type: USRA, NASA(USRA University Advanced Design Program Fifth Annual Summer Conference; p 179-186
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  • 8
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    Customizing the JPL Multimission Ground Data System for Improved Productivity (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The Multimission Ground Data System was designed as a generic data system to meet the needs of multiple missions and avoid re-inventing capabilities for each new mission and thus reduce costs.
    Type: SpaceOps '94; Greenbelt, MD; United States
    Format: text
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  • 9
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    Combining materials and structures research on composite materials. (1965)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Materials structures research within framework of mechanical constitutive equation, reviewing fiber reinforced composites from microscopic to macroscopic viewpoints
    Keywords: STRUCTURAL MECHANICS
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  • 10
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    A finite element overlay technique for modeling pinned composite joints (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A finite element technique using overlaid plane stress elements is presented for modeling a pinned composite joint. The technique allows for discrete modeling of the pin and web regions of the joint in a two-dimensional (2-D) finite element analysis. Thus, predictive capability is substantially increased without the added complexity of a three-dimensional (3-D) analysis. The overlay technique requires a thorough evaluation of the model constraints between the joint components. Bearing panels are used to account for a reduced compressive modulus under bearing loads. Application of the plane stress overlay technique to the Filament Wound Case (FWC) Program is discussed. The experimental approach to determine bearing panel moduli using a double lap shear test is detailed, and finite element results are correlated with full-scale FWC joint test results.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 86-1420
    Format: text
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