Abstract
The accurate numerical simulation of projectile penetration process is a complex challenge. Experimental investigation of these time-dependent non-linear events is expensive and time-consuming. In this paper, 3-D numerical simulations are carried out to estimate the penetration performance of designed penetrators against the double and triple brick-wall, plain concrete wall and light armor targets at impact velocities of 120 to 300 m/s, undergoing normal and oblique impacts. In all simulations, both the projectile and targets are modeled using Lagrange solver facility, available in ANSYS/Autodyn. During penetration process, targets experience severe grid deformation in the region local to the penetrator. Highly distorted elements are removed from the calculation using erosion strain algorithm. The simulation results suggest that at maximum velocity flat-nose (FN) projectile successfully perforate all the targets with significant residual velocity, for both normal and maximum oblique impact scenarios. For impact velocity of 120 m/s, the FN projectile perforated the armor and concrete targets but was not able to penetrate and cross through these targets. However, both brick-wall targets were perforated at normal and maximum oblique angle with sufficient residual velocity. The validation of the calculated results and numerical setup were made with experiments against double and triple brick-wall targets for impacting velocity of 170 m/s. Good agreement between the experimental and estimated projectile residual velocity has been achieved. In contrast to FN projectile, the ogive-nose penetrator calculated results has shown ricocheting behavior on impacting the light armor target at minimum velocity and maximum obliquity. The FN projectile has shown better perforation and penetration performance against light armor and domestic targets. The projectile minimum velocity is also estimated numerically to fully penetrate three different types of targets. These results would be beneficial for the designers and operators to get the desired performance against domestic and light armor targets with sureness. Keywords: Numerical simulation, Oblique impact, Perforation, Penetration, Brick-wall
Highlights
The increased urban combat requires the designers and battlefield planners to have accurate information regarding the effects of their existing and new weapons against the variety of targets like light armor vehicles and walls made of concrete, brick, adobe, and masonry
Flat- nose projectile is considered for further study in this paper to predict the targets perforation and projectile residual velocity estimations
Projectiles impact on three different targets (RHA, concrete, and brick-wall) for various velocities at normal and oblique impact is analyzed
Summary
The increased urban combat requires the designers and battlefield planners to have accurate information regarding the effects of their existing and new weapons against the variety of targets like light armor vehicles and walls made of concrete, brick, adobe, and masonry. The advancement in numerical techniques makes it easier for a designer to simulate the dynamic problems of impact, penetration, and explosions to a variety of targets Researchers are using these sophisticated codes [1,2,3,4,5,6,7] from many decades to simulate the blast and penetration phenomenon for metallic, concrete and masonry materials to capture the detailed failure damage mechanism experienced by both projectile and targets. At the minimum velocity and maximum obliquity, the FN projectile can perforate the normal strength concrete and half inches thick rolled homogeneous armor targets but was not able to penetrate and cross through these targets with adequate residual velocity. The simulations and test results would be beneficial for the designers and operators to design an efficient initiating system to get the desired performance against domestic and light armor targets
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