SHEAR PROPERTIES OF BRAIN TISSUE OVER A FREQUENCY RANGE RELEVANT FOR AUTOMOTIVE IMPACT SITUATIONS: NEW EXPERIMENTAL RESULTS

A comparison between porcine and human white and gray matter samples was conducted over a new large frequency range associated with both non-penetrating ballistic and road traffic impacts. The goal of the research is to improve the definition of the shear linear material properties of brain tissue. Oscillatory experiments were carried out by using an original custom-designed oscillatory shear testing device. The findings indicate that there was no significant difference between the linear viscoelastic behavior of the human and porcine brain tissues. The white and gray matters seem to be similar at small strains too. The robustness of the experimental protocol and the reliability of the data were checked utilizing a standard rheometer. A good agreement was found between the data obtained in the frequency and time field. The linear relaxation modulus was ascertained over an extensive time range. The nonlinear behavior of brain tissue was studied using stress relaxation tests, in the first approach. The time relaxation behavior was independent of the applied stain, and brain tissue showed significant shear softening for strains above 1%. A visco-hyperelastic model was proposed using the Ogden hyperelastic model and the generalized Maxwell model. These models describe the strain dependence of the shear stress and the linear relaxation modulus, respectively.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/1640206
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Nicolle, S
  • Lounis, M
  • Willinger, R
• Publication Date: 2004-11

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 239-258
• Serial:
  • Stapp Car Crash Journal
  • Volume: 48
  • Publisher: Society of Automotive Engineers (SAE)
  • ISSN: 1532-8546
  • Serial URL: http://www.stapp.org/pubs.shtml

Subject/Index Terms

• TRT Terms: Brain; Crash injuries; Crash injury research; Experiments; Head; Human beings; Mechanical relaxation; Oscillation; Shear properties; Shear stress; Shear tests; Traffic crashes; Viscoelasticity
• Uncontrolled Terms: Hyperelasticity; Linear relaxation modulus; Swine
• Subject Areas: Highways; Research; Safety and Human Factors; I84: Personal Injuries;

Filing Info

• Accession Number: 00988816
• Record Type: Publication
• ISBN: 0768014468
• Report/Paper Numbers: 2004-22-0011
• Files: TRIS
• Created Date: Apr 12 2005 12:00AM