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Experimental study of the expansion dynamic of 9 mm Parabellum hollow point projectiles in ballistic gelatin.

Abstract：

:We study in this paper the expanding behaviour of hollow point 9 mm Parabellum projectiles (Hornady XTP(®) and Speer Gold Dot(®)). We defined a deformation rate that takes into account both the diameter increase and the length reduction. We plotted the behaviour of this parameter versus impact velocity (we refer to this curve as the expanding law). This expanding law has been plotted for different gelatin weight ratios and different gelatin block lengths. We completed our experiments with a set of high speed movies in order to correlate the deceleration to the state of expansion and size of the temporary cavity. Our results pointed out that full expansion is reached shortly after the projectile fully penetrates the gelatin. This result shows that the key point to accurately simulate human body interaction with a hollow point projectile is to accurately simulate the interface (skin, skull, clothes thoracic walls). Simulating accurately organs is only an issue if a quantitative comparison between penetration depths is required, but not if we only focus on the state of expansion of the projectile. By varying the gelatin parameters, we discovered that the expanding law exhibits a velocity threshold below which no expansion occurs, followed by a rather linear curve. The parameters of that expanding law (velocity threshold and line slope) vary with the gelatin parameters, but our quantitative results demonstrate that these parameters are not extremely critical. Finally, our experiments demonstrate that the knowledge of the expansion law can be a useful tool to investigate a gunshot in a human body with a semi-jacketed projectile, giving an estimation of the impact velocity and thus the shooting distance.

journal_name

Forensic Sci Int

journal_title

Forensic science international

authors

Bresson F,Ducouret J,Peyré J,Maréchal C,Delille R,Colard T,Demondion X

doi

10.1016/j.forsciint.2011.12.007

subject

Has Abstract

pub_date

2012-06-10 00:00:00

pages

113-8

issue

1-3

eissn

0379-0738

issn

1872-6283

pii

S0379-0738(11)00599-8

journal_volume

219

pub_type

杂志文章

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