Physical components of soft-tissue ballistic wounding and their involvement in the generation of blood backspatter.

Abstract:

:Gunshot backspatter comprises biological material expelled backward through bullet entry holes. Crime scene investigators analyze backspatter patterns to infer wounding circumstances. An understanding of the mechanism of backspatter generation, and the relationship between spatter patterns and bullet and tissue characteristics, would enhance the predictive value of such analysis. We examined soft-tissue ballistic wounding responses to determine the underlying components and how these might be relevant to the generation of backspatter. We identified five mechanistic components to ballistic wounding (elastic, viscous, crushing, cutting, and thermal), each related to mechanical disciplines (respectively, solid mechanics, fluid mechanics, fracture mechanics, rheology, and thermodynamics). We identified potential roles for these five components in backspatter formation and provide a scenario whereby a sequence of events incorporating these components could lead to backspatter generation and expulsion. This research provides a framework for the mathematical representation, and subsequent computational predictive modeling, of backspatter generation and pattern formation.

journal_name

J Forensic Sci

authors

Davidson PL,Taylor MC,Wilson SJ,Walsh KA,Kieser JA

doi

10.1111/j.1556-4029.2012.02143.x

subject

Has Abstract

pub_date

2012-09-01 00:00:00

pages

1339-42

issue

5

eissn

0022-1198

issn

1556-4029

journal_volume

57

pub_type

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