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Acta Armamentarii ›› 2022, Vol. 43 ›› Issue (9): 2399-2407.

• Paper •

### Study of Traumatic Ballistic Characteristics of Ultra-high Speed Steel Balls Striking Soap and Biological Targets

LI Guanghua， ZHANG Liangchao， WENG Changmei， ZHANG Dongdong， ZHANG Jieyuan，CHEN Kuijun， DUAN Chaoxia， KANG Jianyi， WANG Jianmin

1. (Department of Weapon Bioeffect Assessment, Army Specialty Medical Center, Chongqing 400042, China)
• Online:2022-08-21

Abstract: By comparing the traumatic ballistic performance of different velocities steel balls striking soap targets and biological targets, the similarities and differences of dynamic responses between the two under hypervelocity fragmentation strikes were explored. A 0.72 g steel ball with different velocities (1 000 m/s, 2 000 m/s, 3 000 m/s, 4 000 m/s) was used to strike the soap target and the hind limb muscle fullness of experimental animals, respectively. The ballistic manifestations of the targets were observed after the strikes, including the size of the entrance and exit, the shape and size of the wound cavity, the extent of injury and the degree of injury in the experimental animals. From 1 000 m/s to 4 000 m/s, the ballistic entrance became larger as the velocity of the steel ball increased. And the ballistic exit gradually increased from 1 000 m/s to 3 000 m/s. At 4 000 m/s velocity, the projectile failed to penetrate the soft tissue, forming a hemispherical wound cavity. The steel ball striking the soap at 1 000 m/s formed a 5 cm diameter entrance and 0.6 cm size exit cone; the steel ball striking the soap at 2 000 m/s formed a 16 cm diameter entrance and 3 cm size exit cone. 4 000 m/s speed striking the soap formed a 25 cm×25 cm×17 cm spherical crater, which did not penetrate the soap. The diameters of the profile projections on different wound depths of the animal transient cavity, animal wound cavity and soap cavity were measured from the ballistic entrance as the starting point at a spacing of 1 cm, respectively. Comparison of the profile diameter change curves under steel ball strikes at the same speed revealed that the profile diameters of the soap cavity and the animal transient cavity were similar at different wound depths of 5 cm to 10 cm at different speeds. Under the ultra-high speed steel ball strike, the cavity formed by the soap target and the transient cavity formed by the biological target at the front end of the wound channel were similar in size. The soap target can reflect the biocidal effect of the hypervelocity steel ball to some extent.

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