Study on damage law of pressed explosives under different impact velocities

DOI:	10.11809/bqzbgcxb2023.08.002
Keywords:	hyper velocity penetration; impact load; pressed explosive; crack; microscopic damage
Abstract:	In order to study the damage evolution law and failure form of compact explosives under different impact speeds, this paper designs a reduced scale experimental projectile, and carries out an experiment of projectile high speed oblique penetration into a single layer steel target by using a 125 mm caliber smooth bore gun. The experimental projectile after the penetration is recovered, and the damage characteristics of the charge are observed at macro and micro scales by using CT scanning/SEM nondestructive testing technology. Then, the penetration process of the single layer steel plate is numerically simulated by LS DYNA software to analyze the internal force of the charge during penetration at different impact speeds. The results show that, when the projectile penetrates the steel target at a high speed, the force on the upper side of the charge is harsh and prone to damage. With the increase of the speed, the force on the shell and the head is intensified, and the force on the charge head under the protection of inert buffer is still harsh, with serious charge damage on the head. Macroscopic observation shows that the charge mainly breaks and forms crack damage, while microscopic observation shows that the main failure form of the charge is transgranular fracture.
Published:	2023-08-28
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