High-speed video analysis of crown formation dynamics of controlled weapon-head impacts on to three surface types.



This work explores the crown formation on a thin film of sheep's blood. Three weapons - a hammer head, a simulating baseball bat, and a metal bar - were used to impact blood on fibreboard, cloth, and sponge. Impact velocity was controlled by a custom impact device. High-speed videos were collected and analyzed with motion tracking and computing software. Interestingly, we have seen that the bloodied sponge is the only one of its kind. The widths and heights where observable crowns were measured and ranged between 0 to 105 mm and -0.4 to 36 mm, respectively. Bloodied material type was observed to influence the size and shape of the crown; However, the weapon heads used in this study did not. Three unusual cases of rim instability were observed in the opposite direction of the expanding crown. This work supports the idea of ​​the formation of dynamics of the mechanisms. Observable crowns can form with a range of geometries and subsequently produce droplets that originate at points from the contact interface between the weapon head and blood.











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