الفهرس 
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Abstract
Composite materials are used in modern industry as an effective replacement for the steel and metals, since omposite materials are lighter in weight than steel and provide higher strength, resistance to several erosion factors and improving energy absorbing capability under impact and collision loading. Many applications have considered composite material as an alternative for metal parts, such as: hull of speed boats, patrol boats and luxury boats, aerospace applications, different body parts of cars, armor vests, swimming pools, storage tanks and electronic devices. The application of composite materials in marine field has been growing and developing through the past years, especially in military units, which account for high speed and lighter weight for high maneuverability and less light weight. Coast guard may be exposed to firing shots from smugglers or illegal immigrants, so the building materials of these boats need to withstand these conditions and experience lowest possible damage. Developing a new composite material based on experiments by changing mechanical properties is quite expensive and takes long time. Therefore, numerical simulation with the aid of finite element method (FEM) is often performed, and has provided close results compared with the experimental ones. Finite Element packages provide very useful tools for modeling such cases and expecting the best results for different materials and configurations, before conducting any experimental works. The results of the finite element analysis provide very essential data in the preliminary design stage. Since several scenarios can be simulated to give supporting data for the proposed design. This work investigates the response of different composite materials in cases of low and high velocity impact and blast loads. Several materials have been considered in this study such as E-Glass composites, carbon fiber composites, Fiber-Metal Laminates [FML], Kevlar/Epoxy and S-Glass composites. These materials have different mechanical properties and therefore their performances are not the same. These materials are used as construction materials for the hull of case study boat; a comparison between their responses is performed. The numerical models of the investigated structures are generated and analyzed in ABAQUS code using different elements types such as shell elements and continuum shell elements. Different impact cases have been considered such as impact of fiber reinforced polymers with low speed ball, also the fiber metal laminates were studied in such a scenario. Also the ballistic limit velocity was determined for different composite materials subjected to high velocity impact case. The effect of changing lay-up arrangements of the plate panel on its response was studied. In this work the response of Glare 3 laminates and Kevlar/Epoxy composites was found to be higher and better than the other materials in the analyses. So it is recommended to consider these materials as candidates for high speed impact conditions.