MSS05: A STUDY OF MATHEMATICAL MODELING FOR IDENTIFICATION OF SPECIFIC FEATURES OF THE TERMINAL BALLISTICS FOR THE GUNSHOT BULLET AND SHRAPNEL WOUNDS
Igor Lurin, MD, PhD, Professor, MajorGeneral1; Oleksiy Larin, Professor2; Oleksandr Kolomiitsev, Professor3; Eduard Khoroshun, Colonel4; Volodymyr Nehoduiko, Prfessor, Colonel4; Andriy Zuev, Professor5; Andriy Grabovskyi, Professor5; Oleksii Vodka, Professor5; Serhii Larkov, Professor6; Andrii Dinets, PhD, Associate Professor1; 1National Academy of Medical Sciences of Ukraine, Kyiv, Ukraine; 2Kharkiv Polytechnical University; 3National Scientific Center «Hon. Prof. M. S. Bokarius Forensic Science Institute» the Ministry of Justice of Ukraine, Kharkiv, Ukraine; 4Military Medical Clinical Center of the Northern Region of Ministry of Defense of Ukraine, Kharkiv, Ukraine; 5Kharkiv Polytechnical University, Kharkiv, Ukraine; 6National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Ministry of Education and Science of Ukraine, Kyiv, Ukraine
Objectives: War of Russia against Ukraine is ongoing and showing various clinical courses of gunshot wounds. Experimental data from mathematical modeling expand the understanding of tissue changes in gunshot wounds.
The aim of the study was to demonstrate and evaluate specific features of terminal ballistics of gunshot bullets in ballistic plastilene with similar density properties with biological soft tissues of by using mathematical modeling.
Methods: The following two samples of cylindrical elements were use as ready-made elements (diameter 10 mm, length 10 mm), which were equipped with high-explosive warheads "9M55" 122 mm and «9M28F» from GRAD MLRS system and ready to use elements from land-mine «O3M-72». Documentation of the contact speed of the element before hitting the target was carried out using an optoelectronic measuring complex «IBH-731.4». Shots were made at blocks of Weible Ballistics Plastilene 250×200 mm in distance of 1.5 m. The control measurements were performed by using shooting data from bullets 7.62×25TT (57-H-134C) and 5,45×39 (7H6). A mathematical model was created by using computer simulation. A viscoelastic plastic material was chosen according to the Cover-Symonds model.
Results: The velocity of the elements in the ready-to-use elements and bullets was from 53.8 to 369.3 m/s, the depth of the damage channel was from 24.8 to 149.6 mm, the volume of the damage channel varied from 2.6 to 80.4 cm3.
A 7.62 mm caliber bullet (speed of 300 m/s) penetrated to a depth of 350 mm +/- 50 mm, forming a complex wound channel. In computational studies, a penetration depth 372 mm was obtained.
A cylindrical steel fragment measuring 10x10 mm (speed 350 m/s) penetrated to a depth 131 mm +/- 20 mm and formed a distinct wound channel of almost conical shape. In computational studies, a depth of 155 mm was obtained. Thus, the size and nature of material damage from a shrapnel wound are, on average, 2.6 times less than from a bullet wound. The major damage was detected in the area of the first third of the damage channel, where the element gave the adjacent layers most of its kinetic energy, resuting in destruction and deformations at significant distances from the point of impact in the radial direction. Similar findings of the dependence of accelerations in time were also obtained during computer simulation.
Conclusions: Mathematical modeling in ballistic plastiline might be useful to predict the volume of damage caused by gunshot projectiles with different ballistic characteristics in biological soft tissues.