Low velocity ballistic characterization of steel armour plates by drop-weight test

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2002
Şimşir, Caner
The primary aim of this study was to investigate the parameters that affect the low velocity ballistic performance of thin steel armour. Investigated parameters include armour plate related parameters (Hardness, UTS, Yield Strength etc.) and projectile related parameters (Hardness, Nose geometry). The relationships between the low velocity ballistic performance of steel armour plates and the static mechanical properties and mechanisms of ballistic failure are also investigated. For this purpose, a drop-weight setup was used. The test includes the free fall and the impact of a 8 kg hammer with a 8 mm punching rod from 0.5 m to 4 m. Tested material is Ck67 steel, which is heat treated to obtain a wide range of mechanical properties. In this study, it is obseved that stages of failure were (1) the bending of armour plate, (2) shear localized in intense shear bands and (3) final fracture.. In regards to effect of armour plate in ballistic performance, it is found that an increase in hardness, UTS and yield strength lead to an increase in ballistic limit as well. The relationship between hardness and ballistic limit was linear mbetween 300 HB - 500 HB range. A Similar behaviour was observed for strain hardening rate and ballistic limit between SHR = 3.3 and SHR = 4.4 In regards to the effect of projectile in ballistic performance harder projectiles penetrated the armour easier than soft projectiles. This effect was more significant against hard armour plates. Moreover, conical projectiles gave the lowest ballistic limits. However, full penetration was harder.Petalling type of failure was observed with conical projectiles whereas plugging type of failure was observed with blunt penetrators
Citation Formats
C. Şimşir, “Low velocity ballistic characterization of steel armour plates by drop-weight test,” Middle East Technical University, 2002.