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  • STRUCTURAL MECHANICS  (2)
  • METEOROLOGY AND CLIMATOLOGY  (1)
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  • 1
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    Unknown
    Stress-intensity factors for a surface crack in a finite solid. (1972)
    In:  Other Sources
    Details
    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
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    The partially closed Griffith crack (1973)
    In:  Other Sources
    Details
    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
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Atmospheric turbulence parameters for modeling wind turbine dynamics (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A model which can be used to predict the response of wind turbines to atmospheric turbulence is given. The model was developed using linearized aerodynamics for a three-bladed rotor and accounts for three turbulent velocity components as well as velocity gradients across the rotor disk. Typical response power spectral densities are shown. The system response depends critically on three wind and turbulence parameters, and models are presented to predict desired response statistics. An equation error method, which can be used to estimate the required parameters from field data, is also presented.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Lewis Research Center Large Horizontal-Axis Wind Turbines; p 391-409
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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