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  • STRUCTURAL MECHANICS  (2)
  • 2020-2024
  • 1990-1994
  • 1980-1984  (2)
  • 1
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    Propagation of crazing in viscoelastic media (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In response to a tensile stress glassy polymers exhibit crazing (surface cracks) which is a phenomenon of considerable practical and theoretical importance in the use of many plastics. An attempt is made to demonstrate how craze growth behavior is affected by the craze density (which is defined as the total number of crazes per unit surface area) surrounding the craze.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-173244 , NAS 1.26:173244
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    On the three-dimensional vibrations of the cantilevered rectangular parallelepiped (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A solution is presented for the three-dimensional problem of determining the free vibration frequencies and mode shapes for a rectangular parallelepiped which is completely fixed on one face and free on the other five faces. This problem apparently is previously unsolved in the published literature. The Ritz method is used, with displacements assumed in the form of algebraic polynomials. Convergence is studied. Numerical results are given for the first five frequencies of each of the four symmetry classes of vibration, for five thick parallelepiped configurations, including the cube. Contour plots are exhibited for the modal displacements of the cube. The effects of varying Poisson's ratio are also observed.
    Keywords: STRUCTURAL MECHANICS
    Type: Acoustical Society of America, Journal (ISSN 0001-4966); 73; June 198
    Format: text
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    NASA TECHNICAL REPORTS
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