Abstract
In this study, a constitutive strength and failure model for a steel core of a14.5 mm API projectile was developed. Dynamic response of a projectile steel core was described by the Johnson-Cook constitutive model combined with principal tensile stress spall model. In order to obtain the parameters required for numerical description of projectile core material behavior, a series of planar impact experiments was done. The parameters of the Johnson-Cook constitutive model were extracted by matching simulated and experimental velocity profiles of planar impact. A series of oblique ballistic experiments with x-ray monitoring was carried out to study the effect of obliquity angle and armor steel plate thickness on shattering behavior of the 14.5 mm API projectile. According to analysis of x-ray images the fragmentation level increases with both steel plate thickness and angle of inclination. The numerical modeling of the ballistic experiments was done using commercial finite element code, LS-DYNA. Dynamic response of high hardness (HH) armor steel was described using a modified Johnson-Cook strength and failure model. A series of simulations with various values of maximal principal tensile stress was run in order to capture the overall fracture behavior of the projectile’s core. Reasonable agreement between simulated and x-ray failure pattern of projectile core has been observed.
Highlights
Armor piercing projectiles made of high carbon hardened steel are good penetrators of steel armor at normal incidence
Yeshurun et al [1] found that 4 mm high hardness steel plates at obliquities higher than 45 degrees have a very high ballistic efficiency against both 0.5 and 14.5 mm armor piercing (AP) projectiles
A series of oblique ballistic experiments with x-ray monitoring was carried out to study the effect of obliquity angle and armor steel plate thickness on shattering behavior of the 14.5 API projectile
Summary
Armor piercing projectiles made of high carbon hardened steel are good penetrators of steel armor at normal incidence. Reliable numerical simulation of oblique impact requires a material model able to capture the effect that obliquity has on the fragmentation behavior of the AP projectile. This is a major issue addressed in the present study. A series of oblique ballistic experiments with x-ray monitoring was carried out to study the effect of obliquity angle and armor steel plate thickness on shattering behavior of the 14.5 API projectile. In order to obtain the parameters required for numerical description of projectile core material behavior, a series of planar impact experiments was done. Reasonable agreement between the simulated and xray failure pattern of the projectile core has been observed
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