High velocity impact response of Kevlar-29/epoxy and 6061-T6 aluminum laminated panels

Abstract

a b s t r a c tThe high velocity impact response of composite laminated plates has been experimentally investigated using a nitrogen gas gun. Tests were undertaken on sandwich structures based on Kevlar-29 fiber/epoxy resin with different stacking sequence of 6061-T6 Al plates. Impact testing was conducted using cylindrical shape of 7.62 mm diameter steel projectile at a range of velocities (180-400 m/s) were investigated to achieve complete perforation of the target. The numerical parametric study of ballistic impact caused by same conditions in experimental work is undertaken to predict the ballistic limit velocity, energy absorbed by the target and comparison between simulation by using ANSYS Autodyn 3D v.12 software and experimental work and study the effects of shape of the projectile with different (4, 8 and 12 mm) thicknesses on ballistic limit velocity. The sequence of Al plate position (front, middle and back) inside laminate plates of composite specimen was also studied. The Al back stacking sequence plate for overall results obtained was the optimum structure to resist the impact loading.The results obtained hereby are in good agreement with the experimental (maximum error of 3.64%) data where it has been shown that these novel sandwich structures exhibit excellent energy absorbing characteristics under high velocity impact loading conditions. Hence it is considered suitable for applications of armor system.

Numerical Material Model for Composite Laminates in High-Velocity Impact Simulation

“…Johnson-Cook material model, including strain/strain rate hardening and thermal softening effects, is selected to model the FSP; while the target plate is modeled by the developed material model. The parameters of this two material models are summarized in Table 1 (Ramadhan et al, 2013;Ansari and Chakrabarti, 2016) and Brick elements with single integration point, which are more robust than the fully integrated elements, are used to discretize the target and projectile. Each ply of composite laminate is modeled using a single solid element, and thus 19 elements are assigned along the thickness direction.…”

Energy absorption capability and deformation of laminated panels for armoured vehicle materials

“…These results show that AA7075-T6 can absorb energy better when it is placed in the middle layer rather than on the bottom layer. Owing to the very high-strength and high-hardness steel as the front layer, the energy was mostly absorbed by the front layer and created a marginal stress effect on the Al7075-T6 as the second layer [21][22][23]. The conformity of the deformation pattern of the projectile during impact on both double-layered and triple-layered plates for the numerical results still needed to be done with the experimental results.…”

“…On the other hand, computer simulation has been proven to be a powerful and economical tool for the prediction of the deformation and penetration of laminated panels [8,9]. In recent years, many scholars have concentrated on using the finite element method to study the behaviour of developed panels (Nair et al, 2013; Ramadhan et al, 2013). They integrated light materials, such as composites and aluminium alloys, with existing armoured steel to reduce the weight.…”

The Effects of Stacking Sequence Layers of Hybrid Composite Materials in Energy Absorption under the High Velocity Ballistic Impact Conditions: An Experimental Investigation

“…Test section is made of high strength steel that give out most protection during the experiment. The test section chamber is 600 × 450 × 450 mm 3 , length, height, and width respectively as shown in Figures 3-7 [13][14][15]. It gives enough space for the bullet to be calibrated and stopped.…”