Study on Behind Helmet Blunt Trauma Caused by High-Speed Bullet

Table 1

Bullet material parameters.

Projectile type	(kg/m^3)	(GPa)		Yield stress (GPa)	Tangent modulus (GPa)
Handgun bullet [20]	8110	210	0.3	0.792	21
Fragmentation bullet [23]	7830	206.8	0.3
Rifle bullet armor [24]	8960	124	0.3
Rifle bullet steel core [24]	7850	206	0.3