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Composites are wonderful materials that have revolutionized the field of engineering because they can provide more versatility when compared to other materials and can be tailored to have maximum strength and stiffness. Experimental investigation was carried out to study the influence of fiber volume fraction, fiber length and percentage of fillers on fracture toughness ,fracture energy and impact energy of glass fiber reinforced composite. Panels with different configurations were made using fiber glass chopped strand mat and unidirectional roving with epoxy resin. Wet Hand Layup method was adopted for fabrication of panels with different fiber volume fractions and filler density while Bulk Molding Compound Technique was used for making panels with different fiber lengths. ASTM D-5045-14 was consulted for the development of test specimens to conduct flexural testing of these panels.

Adhesive bonding is increasingly being used in load-bearing engineering applications, particularly for joining sheet materials. The strength of the adhesive bonding is affected by bond length, adhesive thickness, adherend thickness, curing conditions and joint end geometry. In this experimental work single lap joints (SLJ) were tested to study the effect of joint end geometry on failure strength for three different adhesives using aluminum alloy as adherend. Three end geometries i.e. square ended, filleted and tapered plus filleted were evaluated. Test specimens were prepared in accordance with ASTM standard D-1002-10. Experimental results demonstrate that filleted end geometry shows the maximum failure strength and square ended joint has the least strength for all three adhesives.

Fiber reinforced laminated materials are becoming popular in applications involving protection against impact loading. Laminates offer many advantages over metal plates in these applications. Laminates are normally non-ricochet, thus offering greater protection against projectiles. Laminates are also lighter in weight and less expensive as compared to the metal panels. In this study, laminated materials were fabricated from two different types of fibers which included short fibers and random fibers. Epoxy and polyester were used as the resin materials in the production of different types of laminates. Test samples were tested according to the available standards to investigate the impact toughness and ballistic resistance of these laminates. Experimental results showed that random fibers and polyester resin absorbed more energy as compared to short fibers and epoxy resin, respectively.