Experimental investigation of the mechanical properties of brain simulants used for cranial gunshot simulation

Milad Soltanipour Lazarjan, Patrick Henry Geoghegan, Mark Christopher Jermy*, Michael Taylor

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The mechanical properties of the human brain at high strain rate were investigated to analyse the mechanisms that cause backspatter when a cranial gunshot wound occurs. Different concentrations of gelatine and a new material (M1) developed in this work were tested and compared to bovine brain samples. Kinetic energy absorption and expansion rate of the samples caused by the impact of a bullet from .22 air rifle (AR) (average velocity (uav) of 290m/s) and .22 long rifle (LR) (average velocity (uav) of 330m/s) were analysed using a high speed camera (24,000fps). The AR projectile had, in the region of interest, an average kinetic energy (Ek) of 42±1.3J. On average, the bovine brain absorbed 50±5% of Ek, and the simulants 46-58±5%. The Ek of the .22 LR was 141±3.7J. The bovine brain absorbed 27% of the .22LR Ek and the simulants 15-29%. The expansion of the sample, after penetration, was measured. The bovine brain experienced significant plastic deformation whereas the gelatine solution exhibited a principally elastic response. The permanent damage patterns in the M1 material were much closer to those in brain tissue, than were the damage patterns in the gelatine. The results provide a first step to developing a realistic experimental simulant for the human brain which can produce the same blood backspatter patterns as a human brain during a cranial gunshot. These results can also be used to improve the 3D models of human heads used in car crash and blast trauma injury research.

Original languageEnglish
Pages (from-to)73-78
Number of pages6
JournalForensic Science International
Volume239
DOIs
Publication statusPublished - Jun 2014

Keywords

  • Backspatter
  • Bloodstain pattern analysis
  • Brain simulant
  • Cranial gunshot
  • Kinetic energy loss

Fingerprint Dive into the research topics of 'Experimental investigation of the mechanical properties of brain simulants used for cranial gunshot simulation'. Together they form a unique fingerprint.

  • Research Output

    • 3 Article
    • 2 Conference contribution

    Experimental measurement of breath exit velocity and expirated bloodstain patterns produced under different exhalation mechanisms

    Geoghegan, P. H., Laffra, A. M., Hoogendorp, N. K., Taylor, M. C. & Jermy, M. C., 1 Sep 2017, In : International Journal of Legal Medicine. 131, 5, p. 1193-1201 9 p.

    Research output: Contribution to journalArticle

    Open Access
    File
  • Experimental and computational investigation of the trajectories of blood drops ejected from the nose

    Geoghegan, P. H., Spence, C. J. T., Wilhelm, J., Kabaliuk, N., Taylor, M. C. & Jermy, M. C., 1 Mar 2016, In : International Journal of Legal Medicine. 130, 2, p. 563-568 6 p.

    Research output: Contribution to journalArticle

  • Visualization of the air ejected from the temporary cavity in brain and tissue simulants during gunshot wounding

    Lazarjan, M. S., Geoghegan, P. H., Taylor, M. C. & Jermy, M. C., 1 Jan 2015, In : Forensic Science International. 246, p. 104-109 6 p.

    Research output: Contribution to journalArticle

  • Cite this