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  • 1
    Publication Date: 2006-10-26
    Description: Design and performance of traveling wave maser amplifier for communications ground station
    Keywords: MASERS
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  • 2
    Publication Date: 2019-06-28
    Description: Automated low-altitude flight and landing in remote areas within a civilian environment are investigated, where initial cost, ongoing maintenance costs, and system productivity are important considerations. An approach has been taken which has: (1) utilized those technologies developed for military applications which are directly transferable to a civilian mission; (2) exploited and developed technology areas where new methods or concepts are required; and (3) undertaken research with the potential to lead to innovative methods or concepts required to achieve a manual and fully automatic remote area low-altitude and landing capability. The project has resulted in a definition of system operational concept that includes a sensor subsystem, a sensor fusion/feature extraction capability, and a guidance and control law concept. These subsystem concepts have been developed to sufficient depth to enable further exploration within the NASA simulation environment, and to support programs leading to the flight test.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-CR-177478 , NAS 1.26:177478
    Format: application/pdf
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  • 3
    Publication Date: 2019-06-27
    Description: A numerical solution to the three-dimensional equations of elasticity is presented for the problem of a semi-elliptical surface crack in the surface of a finite thickness solid. The alternating method is used to develop the numerical results which incorporate the effects on the stress intensity factor due to the presence of both the front and the back surfaces. The stress intensity factor is presented as a function of position along the crack border for a variety of crack shapes and crack depths. A comparison of the results of this study is made with previous theoretical and experimental work.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Fracture; 12; Feb. 197
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  • 4
    Publication Date: 2019-06-27
    Description: A solution to the problem of a circular crack partially embedded in a solid of finite thickness is presented. A superposition and iteration technique is used to determine the stress-intensity factor numerically. The stress-intensity factor is determined as a function of position around the crack front for a variety of crack depths. The results of this study are compared with experimental data for a semielliptical surface flaw in a brittle material.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 71-APMW-6
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  • 5
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    In:  Other Sources
    Publication Date: 2019-06-27
    Description: A solution is presented for a Griffith crack subjected to an arbitrary polynomial loading function which causes one end of the crack to remain closed. Closed form expressions are presented for the crack opening length and for the stress and displacements in the plane of the crack. The special case of pure bending is presented as an example and for this case the stress intensity factor is computed.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Fracture; 9; Mar. 197
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  • 6
    Publication Date: 2019-07-27
    Description: The equations of elasticity are solved for the problem of a flat elliptical crack which has nonuniform shear stresses applied to its surfaces. The shear stresses are prescribed independently in two directions on the crack surface and are expressed in the form of a third-degree polynomial. Mode-two and mode-three stress-intensity factors are presented in analytical and graphical form as functions of position along the crack border.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 73-APMW-42 , Applied Mechanics Western Conference; Sept. 17-19, 1973; Menlo Park, CA
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  • 7
    Publication Date: 2019-06-27
    Description: The three-dimensional equations of elasticity are solved for a flat elliptical crack which has nonuniform shear stresses applied to its surfaces. An alternating method is used to determine the mode two and mode three stress intensity factors for a semielliptical surface crack in the surface of a finite thickness solid. These stress intensity factors are presented as a function of position along the crack border for a number of crack shapes and crack depths. This same technique is followed to determine the mode one stress intensity factors for the semielliptical surface crack which has normal loading applied to its surface. Mode one stress intensity factors are presented and compared with the results obtained from previous work.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-134684
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  • 8
    Publication Date: 2019-07-13
    Description: Room-temperature static and cyclic tests were made on 21 aluminum plates in the shape of a 91.4x91.4-cm Maltese cross with 45 deg flaws to develop crack growth and fracture toughness data under mixed-mode conditions. During cyclic testing, it was impossible to maintain a high proportion of shear-mode deformation on the crack tips. Cracks either branched or turned. Under static loading, cracks remained straight if shear stress intensity exceeded normal stress intensity. Mixed-mode crack growth rate data compared reasonably well with published single-mode data, and measured crack displacements agreed with the straight and branched crack analyses. Values of critical strain energy release rate at fracture for pure shear were approximately 50% higher than for pure normal opening, and there was a large reduction in normal stress intensity at fracture in the presence of high shear stress intensity. Net section stresses were well into the inelastic range when fracture occurred under high shear on the cracks.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-135197 , MCR-77-131
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  • 9
    Publication Date: 2019-07-13
    Description: This paper summarizes and evaluates the work done on the elastic analysis of the surface flaw problem by the application of the alternating method. An attempt is made to describe the alternating method and to present the history of its application to the surface flaw problem and to related problems in fracture mechanics. Stress intensity factors obtained by this method are summarized and compared. Results are also compared to those obtained by investigators using other methods of analysis. An evaluation of the use of the alternating method is presented with the purpose of pointing out the advantages and disadvantages in the application of this technique to the surface flaw problem.
    Keywords: STRUCTURAL MECHANICS
    Type: The surface crack: Physical problems and computational solutions; Winter Annual Meeting; Nov 26, 1972 - Nov 30, 1972; New York, NY
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  • 10
    Publication Date: 2019-06-27
    Description: Stress intensity factors for surface flawed fracture specimens
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-106261
    Format: application/pdf
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