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  • STRUCTURAL MECHANICS  (513)
  • ASTROPHYSICS
  • Humans
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  • 1970-1974  (271)
  • 1965-1969  (274)
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  • 1
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    On the e-process - Its components and their neutron excesses (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The pattern of abundances within the iron-abundance peak of the solar system is analyzed for various Cr, Fe, and Ni abundances, and a method is developed for finding the best fit to a given set of abundances with a chosen number of zones, i.e., mass contributions characterized by differing values of eta. This material can be synthesized by a superposition of e-process compositions in a low-eta region (eta = 0.003) and a high-eta region (eta = 0.065 -0.080) with at least 85% coming from the low-eta region. Addition of a third eta zone is unproductive. The applicability of the particle-poor freeze out is discussed in the light of these abundances, and the results of employing different numbers and types of zones are interpreted as an indication of the relative abundances themselves. Ejection of the low-eta zones is of great interest in gamma-ray astronomy and for empirical testing of theories of nucleosynthesis. The distribution of high zones should give important information about the formation of collapsed remnants.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 193; Oct. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Dynamic stability and parametric resonance in cylindrical propellant tanks Final report (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Dynamic stability and parametric resonance of longitudinally excited liquid propellant tank model
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-61725
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Magnetic shielding experiences (1965)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Magnetic shields of Mumetal for magnetometer sensors of Mariner Mars spacecraft
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Component shielding (1965)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Evaluation of Mumetal shielding for reed switch relays
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Transmission characteristics of conical and cylindrical shells under lateral excitation. (1968)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Steady state frequency response of conical and cylindrical shells under lateral excitation
    Keywords: STRUCTURAL MECHANICS
    Type: ; YAL SOCIETY (
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The elastic layer with a cylindrical hole subjected to a nonuniform axisymmetric radial displacement. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A problem in the linear theory of elasticity is considered wherein a layer with a circular cylindrical hole is subjected to a nonuniform axisymmetric radial displacement. The solution utilizes Navier's equations of elasticity which are solved by means of extended Hankel transforms. A special case in which the radial displacement is a linear function of the axial coordinate is presented. Numerical results are given in graphical form for the case when hole radius and layer thickness are equal. The inversion integrals were evaluated numerically using Longman's technique for computing infinite integrals of oscillatory functions.
    Keywords: STRUCTURAL MECHANICS
    Type: Acta Mechanica; 17; 1-2,; 1973
    Format: text
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  • 7
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    A non-linear dynamic lumped-parameter model of a rectangular plate. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A lumped-parameter model of a rectangular plate is developed by assuming fundamental mode solutions and using Hamilton's Principle and the Euler equations to set up the differential equation of motion for the system. The plate theory used may be described as the dynamic analogue of the von Karman large-deflection theory. Four sets of symmetrical boundary conditions are considered with the restriction of uniform pressure dynamic loads. The model takes the form of a mass on a cubic-hardening spring with each term defined by algebraic expressions of the plate parameters. The results for some specific problems are compared with two previous solutions. This method is less accurate but simpler to develop and apply.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Sound and Vibration; 21; Apr. 8
    Format: text
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  • 8
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    Nonlinear vibrations of rectangular plates. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A finite-difference method is developed to determine the large amplitude dynamic responses of thin elastic plates subjected to uniform pressure pulse-type loads. Four different sets of boundary conditions are considered. Some specific problems are solved. The results are compared with approximate solutions obtained by Yamaki (1961). The numerical method presented provides an accurate and efficient approximate solution to the problem, and should be useful as a check on other approximate methods. The grid-size and the time-step necessary for obtaining numerical stability depend on the particular problem. For many cases the method converges rapidly and a rather large grid-size and time-step is adequate.
    Keywords: STRUCTURAL MECHANICS
    Type: American Society of Civil Engineers; Journal
    Format: text
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  • 9
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    Four-pole parameters for impedance analyses of conical and cylindrical shells under axial excitations. (1968)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Four pole parameters of truncated thin conical shell under axial excitations obtained by applying membrane shell theory
    Keywords: STRUCTURAL MECHANICS
    Type: ; L AVIV AND HAIFA, IS
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    A comparison of the capabilities of three finite element programs (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Three finite element programs are compared to assess their capabilities as an analysis tool in a structural design process. Because of the need for repetitive analyses as an integral part of a design loop, a candidate program must be capable of handling large problems, operate efficiently, and be readily adaptable for use in computer-aided design. The three programs considered in the study, ELAS,SNAP, and NASTRAN, range from a relatively small finite element program limited to static structural analysis (ELAS) to a large complex general analysis system (NASTRAN). Results are given for comparative speeds and computer resources required for each program in the analysis of sample fuselage problems representative of practical aircraft design.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 277-287
    Format: application/pdf
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