A Computational Analysis of the Ballistic Performance of Light-Weight Hybrid Composite Armors - Report Writing Assignment Help

Assignment Task:

Abstract 

The ability of hybrid light-weight fiber-reinforced polymer–matrix composite laminate armor to withstand the impact of a fragment simulating projectile (FSP) is investigated using a non-linear dynamics transient computational analysis. The hybrid armor is constructed using various combinations and stacking sequences of a high-strength/high-stiffness carbon fiber-reinforced epoxy (CFRE) and a high-ductility/high-toughness Kevlar fiber-reinforced epoxy (KFRE) composite laminates of different thicknesses. The results obtained indicate that at a fixed thickness of the armor both the stacking sequence and the number of CFRE/KFRE laminates substantially affect the ballistic performance of the armor. Specifically, it is found that the armor consisting of one layer of KFRE and one layer of CFRE, with KFRE laminate constituting the outer surface of the armor, possesses the maximum resistance towards the projectile-induced damage and failure. The results obtained are rationalized using an analysis of the elastic wave reflection and transmission behavior at the inter-laminate and laminate/air interfaces. 

Introduction 

Recent experiences of the US military forces in Iraq clearly established the tradeoffs between various armor protection concepts for battle military vehicles. In general, the battlefield commanders desire light, manoeuvrable and fast vehicles which, at the same time, can provide an adequate protection for the vehicle occupants. Traditional (heavy) steel armor while being able to provide the required protection for the on-board personnel and do it at a relatively low cost, contributes a prohibitively large additional weight to the battle vehicles, often increasing the loads beyond the levels anticipated during the vehicle design [1]. Consequently, the vehicles tend to break down at an unacceptably high rate due to failure in engine, transmission, suspension and/or breaking systems. In addition, the fuel efficiency of the vehicles is seriously compromised, as is their ability to carry additional personnel in the case of emergency. Furthermore, reduced mobility of the steel armor-protected battle vehicles makes them an easier target to enemy fire. Due to the aforementioned shortcomings of the steel armor, the military vehicles are increasingly being protected using advanced fiber-reinforced polymer–matrix composite armor systems. While the use of the fiber-reinforced polymer–matrix composite armor is beneficial with regard to attaining lower vehicle weight, higher vehicle manoeuvrability, higher fuel efficiency, lower load levels imposed on the vehicle engine and transmission systems, etc., the associated level of protection of the on-board personnel and the cost of the armor remain critical issues.

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