Abstract
This paper presents the effect of laminated aluminium-steel panel with different configurations in a high-speed impact test. Layering aluminium plate with high strength steel has become an interest in reducing the overall density of armour vehicle body while improving the ballistic resistance. Different layering configurations differ in laminated panel performance. Two layering configurations of double-layered panel achieving 25% of existing panel weight reduction were tested using experiment and computational method to investigate their behaviours when impacted with 7.62-mm full metal jacket at velocity range of 800–850 m/s. The ballistic performance of each configuration plate in terms of ballistic limit velocity, penetration process and permanent deformation was quantified and considered. Laminated panel with aluminium as the front layer reduced the ballistic performance of existing panel to 50% and the other panel maintained its performance. Thus, the laminated panel with aluminium as the back layer can be used in designing a protective structure for armoured vehicle while maintaining the performance of the existing vehicle in achieving weight reduction.
Highlights
Material failure characterisation can be determined using several methods and engineering methods, such as using the finite element analysis
Al7075-T6 aluminium is an interesting option leading to weight-saving and ballistic performance and Al7075-T6 aluminium is an interesting option leading to weight-saving and ballistic performance improvement based on their material properties in terms of tensile strength, bending strength improvement based on their material properties in terms of tensile strength, bending strength and and hardness
Tensile testing was performed three times for each material and the average value of the results obtained were taken as the reference for identifying the mechanical properties of the material. It can be observed from the condition of specimens resulted in Figure 6 that these three materials possess the elastic properties due to the necking process taken place before the material fracture. These materials have elastic to plastic deformation prior to failure and fracture at the same place that is 1/3 of the length gauge as a result of consistent pull off action to cause similar spot of stress concentration [20]
Summary
Material failure characterisation can be determined using several methods and engineering methods, such as using the finite element analysis. The finite element method is an analysis to predict the state of a product or material when encumbered to test the strength of the material before it fails. The penetration depth of the material, as one example of the failure of the material when subjected to a high-speed impact, can be analysed using this method. High-speed impact, known as ballistic impact, is one of the measures used to determine the material resistance to prevent the projectile from penetrating the panel [1]. Failure of a material by ballistic impact is influenced by several factors such as the projectile nose shape, projectile materials, impact velocity, panel layering configuration and mechanical properties of materials constituting the laminated panel [2]. The ballistic test is often performed to test the strength of the materials used in military applications such as vehicle
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