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  • 1
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    Borehole probes: Summary of previous work (1971)
    In:  CASI
    Details
    Publication Date: 2009-11-16
    Description: Previous research explored the applicability of some devices to lunar borehold testing and, in particular, examined the use of such instruments to assess the strength of soils and rocks. Special attention was given to borehole jacks, which essentially conduct a plate bearing test across opposing wall areas. Analytical work employed finite element analysis, the theory of plasticity, and the theory of elasticity using the complex variable method. A number of solutions were reached for tractable subproblems in the set of problems posed when a jack is used to expand sectors of a borehole. In addition, an investigation with physical models was made to explore the modes of behavior for varying boundary conditions and materials, including both elastic and plastic media.
    Keywords: SPACE SCIENCES
    Type: Lunar Surface Eng. Properties Expt. Definition, Vol. 3; 14 p
    Format: text
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  • 2
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    A borehole jack for deformability, strength, and stress measurements in a 2-inch borehole (1971)
    In:  CASI
    Details
    Publication Date: 2006-05-25
    Description: A borehole jack devised for lunar exploration is described and results of its use in simulated lunar solids are presented. A hydraulic cylinder mounted between two stiff plates acts to spread the plates apart against the borehole walls when pressured. The spreading is measured by a displacement transducer and the load is measured hydraulically. The main improvement over previous instruments is the increased stroke, which allows large deformations of the borehole. Twenty-eight pistons are used to obtain a high hydraulic efficiency, and three return pistons are also provided. Pressure-deformation curves were obtained for each test on Lunar Soil Simulant No. 2, a light gray silty basalt powder.
    Keywords: GEOPHYSICS
    Type: Lunar Surface Eng. Properties Expt. Definition, Vol. 3; 28 p
    Format: text
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  • 3
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    An experimental study of the mechanism of failure of rocks under borehole jack loading (1971)
    In:  CASI
    Details
    Publication Date: 2006-05-25
    Description: Laboratory and field tests with an experimental jack and an NX-borehole jack are reported. The following conclusions were made: Under borehole jack loading, a circular opening in a brittle solid fails by tensile fracturing when the bearing plate width is not too small. Two proposed contact stress distributions can explain the mechanism of tensile fracturing. The contact stress distribution factor is a material property which can be determined experimentally. The borehole tensile strength is larger than the rupture flexural strength. Knowing the magnitude and orientation of the in situ stress field, borehole jack test results can be used to determine the borehole tensile strength. Knowing the orientation of the in situ stress field and the flexural strength of the rock substance, the magnitude of the in situ stress components can be calculated. The detection of very small cracks is essential for the accurate determination of the failure loads which are used in the calculation of strengths and stress components.
    Keywords: GEOPHYSICS
    Type: Lunar Surface Eng. Properties Expt. Definition, Vol. 3; 36 p
    Format: text
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  • 4
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    Test results from a dynamic model dynaflex rotor (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A one-fifth scale dynamic model of the Sikorsky Dynaflex rotor was tested in hover and in forward flight conditions in a wind tunnel. The Dynaflex rotor features an advanced composite structure which flexes to provide a constant speed universal joint action. Testing concentrated on confirming that the stability and dynamic response of the rotor were satisfactory. Lift conditions of up to .11 Ct/sigma and advance ratios as high as .46 were reached. Vibratory loads were compared to those of articulated rotors. The Dynaflex rotor concept appears to be a practical concept from the standpoint of dynamic response and stability.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Ames Research Center Rotorcraft Dynamics 1984; p 57-68
    Format: application/pdf
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  • 5
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    Instrumentation for Biological Research, Volume I, Sections 1 to 3 Final Report, Nov. 9, 1964 - Mar. 31, 1966 (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Bioinstrumentation for controlling and measuring parameters interacting with biological system
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-74367 , F-B2299, VOL. I
    Format: application/pdf
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  • 6
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    Subminiature micropower digital recorder (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: High-density digital data, collected periodically or randomly from multiplicity of sensors, are recorded by subminiature recorder. Magnetic recording head is energized with suitable pulsatile signals to reverse polarization on magnetically-sensitive tape while tape is immobilized at recording head. Prior to next recording, set tape so new area of tape is at recording head.
    Keywords: ELECTRONIC SYSTEMS
    Type: ARC-10746
    Format: application/pdf
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  • 7
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    Workshop on dimensional analysis for design, development, and research executives (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The proceedings of a conference of research and development executives are presented. The purpose of the meeting was to develop an understanding of the conditions which are appropriate for the use of certain general management tools and those conditions which render these tools inappropriate. The verbatim statements of the participants are included to show the direction taken initially by the conference. Formal presentations of management techniques for research and development are developed.
    Keywords: GENERAL
    Type: NASA-CR-127060
    Format: application/pdf
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  • 8
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    Techniques and instrumentation effort for whale migration tracking (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The following aspects of a research program concerned with tracking gray whales were documented: (1) design, fabrication and testing of a girdle-type harness and associated gear (release mechanism, tracking transmitter, xenon flasher), (2) design, fabrication and testing of instrumentation packs (subminiature recorder, sensor, electronics), (3) field preparations for the January-February 1974 expedition off Mexico, (4) travel arrangements, (5) preliminary field report (capture and handling of juvenile whales, instrumentation and housing tests, harness abrasion and chafing, respiration measurements, sea tracking, distribution, number, and behavior of whales at Lopez Mateos), (6) review, data reduction, and analysis of results.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-137903 , F-C3799
    Format: application/pdf
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  • 9
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    Numerical analyses of deformability tests in jointed rock: Joint perturbation and no tension finite element solutions (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Res. in the Space Sci., v. 2; 12 p
    Format: text
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  • 10
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    Research in life sciences instrumentation pertinent to studies in space biology Quarterly report, 1 Jul. - 30 Sep. 1967 (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Bioinstrumentation research related to aerospace medicine
    Keywords: BIOTECHNOLOGY
    Type: NASA-CR-89600 , Q-B2299
    Format: application/pdf
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