THE TOLERANCE OF BRIDGING VEINS AND THE BRAIN FOR ANGULAR ACCELERATION

BRYGGVENERNAS OCH HJAERNANS TOLERANS GENTEMOT VINKELACCELARATION SAMT KROCKFOERSOEK MED LEVANDE OCH DOEDADJUR. SLUTRAPPORT

Disruptions of parasagittal bridging veins and gliding contusions occur in 40% of car crash victims. Those injuries are caused by angular acceleration of the head. Analysis of high-speed films taken during simulated head-on collisions with human cadavers give the tolerance levels as 4500 rad/sq sec for angular acceleration and 50 rad/sec for change in angular velocity. Ultimate strain in bridging veins under static loading conditions is about 100% but decreases to about 20% at a strain rate of 100/sec. Using material properties of g=1700 Pa and n=0.009 sq m/sec for the brain and blood vessels, gliding contusions were mathematically simulated. Tolerance levels obtained are 4500 radlsa sec for angular acceleration and 60-70 rad/sec for change in angular velocity. For validation purposes, experiments were performed on live and dead pigs. Wearing three-point belts, these were subjected to simulated head-on collisions at 16 and 20 m/sec. Results indicate that tolerance to rib fractures and deformation of rib cage was lower in dead pigs; injuries to big blood vessels were more often seen in dead pigs, and isolated heart lesions only in live ones. Caution is therefore necessary in evaluating tests on cadavers. /TRRL/

  • Corporate Authors:

    Lund University of Technology, Sweden

    Fack S-22007
    Lind 7,   Sweden 
  • Authors:
    • Ljung, CBA
    • Loewenheilm, CGP
    • Wihlborg, B G
    • Voight, G E
  • Publication Date: 1976

Language

  • Swedish

Media Info

  • Features: References;
  • Pagination: 22 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00153316
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Report/Paper Numbers: Monograph
  • Files: ITRD, TRIS
  • Created Date: Sep 20 1977 12:00AM