ANGULAR ACCELERATION OF VISCOELASTIC (KELVIN) MATERIAL IN A RIGID SPHERICAL SHELL-A ROTATIONAL HEAD INJURY MODEL

A finite difference technique was employed to obtain the response of viscoelastic material contained in rigid spherical shells when subjected to a step angular acceleration about a diametrical axis. Keeping the input acceleration impulse as unity, the temporal and spatial responses of the visco-elastic material were compared for various combinations of rectangular pulse magnitude and duration. The results for a single simusoidal pulse input were also compared with the infinite series solution obtained by Bycroft (1973). The finite-difference results for the special case of an elastic material agreed very well with the exact. closed-form solution previously obtained by Liu and Chandran (1973). The primary importance of damping in the brain material is elucidated. A parametric study showed that slight variations of the assumed values of the nondimensional viscoelastic parameter shifted the tolerance curves considerably. Because of this sensitivity, due caution should be exercised in placing too much confidence in arbitarily constructed tolerance curves pending the accurate determination of the viscoelastic properties of the brain over the frequency range of interest to trauma.

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  • Supplemental Notes:
    • Sponsored by the National Institutes of Health and the National Science Foundation.
  • Corporate Authors:

    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  USA  10523
  • Authors:
    • Liu, Y K
    • Chandran, K B
    • Von Rosenberg, D U
  • Publication Date: 1975-9

Media Info

  • Features: Figures; References;
  • Pagination: 8 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00131844
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Contract Numbers: GM 40723-02, GM 19107-01, GK 32047
  • Files: TRIS
  • Created Date: Sep 4 1976 12:00AM