Abstract: A Fresnel zone plate is a flat and compact lens. This paper reports research into Fresnel zone plate constructed using graphene rings. The tunable lensing effect of the lenses was designed and analysed using FDTD method. Then graphene Fresnel zone plate array were fabricated with CVD and photolithography processes. The effect of the lenses was characterized under optical microscope. The experimental results demonstrate that the flat lenses with graphene rings have the ability to focus light with high contrast. The research demonstrates that graphene rings can work in Fresnel zone plates. The optical property of the graphene rings can be tuned by voltage and thus the focal intensity

• Publication Date: 17-Nov-2014
• DOI: 10.15224/978-1-63248-054-5-105
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Abstract: The corrosion of steel is the main problem in stiffened steel plated structures in bridge decks, ship structures and offshore oil platforms. Fiber reinforced polymer composite stiffened plates can be used as an alternative to steel plated structures due to its corrosion resistance, fatigue strength and high strength and stiffness to weight ratio. Large openings are provided in the plated structures for access and service, and the presence of opening influences the strength and failure mode of stiffened plated structures. The main objective of this study is to find the load deflection behaviour, failure mode and strength of stiffened composite plates under inplane and out-of-plane loading. Four glass fiber reinforced stiffened composite plates with and without large opening were fabricated by hand lay-up process using a special lay-up structure to integrate the stiffeners into the flange plate. Initial geometric imperfections in the plate and stiffeners of stiffened composite plates wer

• Publication Date: 17-Nov-2014
• DOI: 10.15224/978-1-63248-054-5-106
• Views: 0
• Downloads: 0