Numerical and experimental investigations on the effect of target thickness and solution treatment on the ballistic behaviour of AA7075 thick plates

Abstract

The influence of target thickness and solution treatment on the ballistic behaviour of AA7075 targets has been investigated by both numerical and experimental methods. In numerical simulation, the target thickness was varied from 19 to 26 mm and an Ogive nose shaped projectile of 7.62 mm diameter with inlet velocities ranging between 800–875 m/s was considered. In order to justify the numerical observations, high velocity ballistic experiments were conducted on AA7075-T651 and the solution treated plates of various thicknesses (12, 16, 18, 20, 22 and 25 mm). For this experimental study, a deformable form projectile with dimensions of 7.62 × 51 mm and an inlet velocity of 850 ± 20 m/s was used. Microstructures of ballistic test samples were analysed using an optical microscope. Numerical analysis using ABAQUS predicted the minimum thickness required to resist complete penetration to be 20 mm in the case of AA7075 plates in the T651 condition, while experimental results showed it to be 21 mm. In the case of AA7075 solution treated plates, numerical simulation analysis predicted the minimum required plate thickness to resist complete penetration to be 24 mm, while the experimental results showed it to be 23 mm. Post ballistic microstructure analysis revealed that there was no change in the microstructure in the AA7075-T651 condition plates. Solution treated plates showed deformation of grains nearer to the impact region with the formation of adiabatic shear bands. In the case of the T651 plate, the mode of fracture was brittle, resulting in splinters, whereas it was petalling in the case of the solution-treated plates. The numerically predicted depth of penetration on both targets was reasonably close to experimental results with an average of 4% error.

Comparative analysis of experimental and numerical investigation on multiple projectile impact of AA5083 friction stir welded targets

“…DIC was found to be a valuable tool for comparing the deformation response of different welding techniques. Praveen et al (2022) conducted numerical and experimental investigations to study the ballistic behavior of AA7075 thick plates under different target thicknesses and solution treatments [ 76 ]. The results showed that the solution treatment improved the BR of the plates, and thicker plates exhibited better ballistic performance.…”

“…Damage criteria are also crucial for obtaining reliable numerical ballistic results [22]. It was discovered that the correlation between experimental and numerical ballistic impact analysis of two distinct heat treated AA7075 aluminium alloy targets was stronger [23][24][25]. The vast majority of research on AA5083 targets [8,9] has been conducted using thin sheets and single hits.…”

Fuzzy logic expert system with multi-objective optimization of carbon nanotube infused nanopaint surface characteristics analysis using IRB 1410 robot

“…Precise control of film thickness reduces the paint consumption. [50][51][52] The variations in film thickness for normal paint material and different MWCNT-based nanopaint are plotted in Figure 8. It is observed that there is a decrease of 3.1% in film thickness when compared with 0.5 gm of MWCNT nanopaint and a 3.4% decrease than normal painting thickness.…”

Optimization of target thickness and investigation on the effect of heat treatment on the ballistic performance of aluminium alloy 7075 targets against hard steel core projectile

“…A group of researchers investigated the ballistic response of aluminium 7xxx grades at higher impact velocity projectiles using experimental, theoretical and numerical studies. 12,13 By using the friction stir processing approach, 14,15 the ballistic performance of B 4 C reinforced AA7075 target was investigated. They reported that adding boron carbide and molybdenum disulphide to the surface of the aluminium alloy 7075 target surface improved its wear and ballistic resistance.…”

“…So far, the literature has dealt with a variety of numerical and experimental ballistic studies on composite materials, surface modifications, reinforcement of metal matrix composites, different kinds of projectiles and their shapes, optimized ballistic limit velocities, and friction stir process plates. [1][2][3][4][5][6][7][8][9][10][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Furthermore, there are numerous reports in the literature on the high-velocity impact of various Al alloys; a comprehensive study on the projectile's penetration behaviour in single layered rolled condition plates of various thicknesses and heat treatments are needed. As a result, the specified condition of heat treatment and optimized target thickness necessary to prevent complete penetration can be chosen.…”