Advanced Composites Research Papers - Academia.edu (original) (raw)

Piezoelectric materials are widely referred to as “smart” materials because they can transduce mechanical pressure acting on them to electrical signals and vice versa. They are extensively utilized in harvesting mechanical energy from vibrations, human motion, mechanical loads, etc., and converting them into electrical energy for low power devices. Piezoelectric transduction offers high scalability, simple device designs, and high‐power densities compared to electro‐magnetic/static and triboelectric transducers. This review aims to give a holistic overview of recent developments in piezoelectric nanostructured materials, polymers, polymer nanocomposites, and piezoelectric films for implementation in energy harvesting. The progress in fabrication techniques, morphology, piezoelectric properties, energy harvesting performance, and underpinning fundamental mechanisms for each class of materials, including polymer nanocomposites using conducting, non‐conducting, and hybrid fillers are d...

Aluminum based metal matrix composites (MMCs) are appropriate materials for structural applications in the aircraft and automotive industries because they are ductile, highly conductive, and lightweight and have a high strength-to-weight ratio. Uniform dispersion of the fine reinforcements and a fine-grained matrix improve the mechanical properties of the composite. The present work proposes to take aluminum as the matix and nanomaterials such as carbon nanotube, graphene and nano-diamond as reinforcement to get the nanocomposites. The synthesis is carried out by powder metallurgy technique. Further the works propose to study the microstructural study and density, hardness, wear study of these nano composites with different volume fraction. Scanning electron is done to know the distribution of matrix and reinforcement.

- by Dr. Ramesh B.T.
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- Mechanical Engineering, Materials Science, Design, Composite Materials
- by Lelli Van Den Einde
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- Civil Engineering, Composite Materials, Structures, Advanced Composites

Piezoelectric materials are widely referred to as "smart" materials because they can transduce mechanical pressure acting on them to electrical signals and vice versa. They are extensively utilized in harvesting mechanical energy from vibrations, human motion, mechanical loads, etc., and converting them into electrical energy for low power devices. Piezoelectric transduction offers high scalability, simple device designs, and high-power densities compared to electro-magnetic/static and triboelectric transducers. This review aims to give a holistic overview of recent developments in piezoelectric nanostructured materials, polymers, polymer nanocomposites, and piezoelectric films for implementation in energy harvesting. The progress in fabrication techniques, morphology, piezoelectric properties, energy harvesting performance, and underpinning fundamental mechanisms for each class of materials, including polymer nanocomposites using conducting, non-conducting, and hybrid fillers are discussed. The emergent application horizon of piezoelectric energy harvesters particularly for wireless devices and self-powered sensors is highlighted, and the current challenges and future prospects are critically discussed.

This paper extends previous work concerning filament wound carbon-fiber tubes utilizing a high modulus nanosilica-modified matrix resin (3M™ Matrix Resin 4833). The incorporation of surface-modified nanosilica at a very high weight fraction increases ply-level transverse and shear modulus dramatically. These in turn impact shaft stiffness in the axial and hoop directions, and through them the torsional buckling strength and natural frequency of the shaft. Here, additional neat resin and composite carbon fiber tube data are provided to augment the previously-reported data. Experimental verification of the use of torsional buckling as a shaft strength criteria is demonstrated. The shaft design equations are then exercised with simple composite laminate angle sequences to highlight the property advancements in filament wound tube structures resulting from significantly increased resin matrix stiffness. Fiber hybridization is also considered.

- by Osman Hag-Elsafi
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- Engineering, Advanced Composites, Composite structures, Reinforced concrete
- by Suong Hoa
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- Engineering, Materials Science, High Pressure, Nanocomposites
- by Issam Harik
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- Advanced Composites, Flexural Strength, Carbon Fibers, Girders

Aluminium composites contains 85% of Al 2618 alloy, 10% of graphite powder and 5% of E glass have been fabricated by stir casting method. Wear, hardness and compressive tests are conducted and compared with each other, sliding wear test carried out on pin on disc apparatus with constant speed and time but varying loads. Compressive test carried out in universal testing machine (UTM) for heat treated and non heat treated samples for obtaining compressive strength and it will be compared each other. Brinell and Rockwell hardness are carried out in hardness apparatus. It includes depth of indentation on surface of samples in different positions by using formula of BHN the hardness of the sample is calculated. In case of Rockwell hardness test direct reading from testing apparatus obtained but it includes different scales with having standard loads for example in this thesis B scale used which having load of 100kg. Hence by applying load in different positions on surface of sample and averaging of these readings will give the RHN value. The best results are obtained by heat treated samples compare with un heat treated samples.

- by Dr. Ramesh B.T.
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- Mechanical Engineering, Design, Manufacturing, Composite Materials
- by Lelli Van Den Einde
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- Civil Engineering, Materials Science, Composite Materials, Multidisciplinary
- by Reza Masoodi
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- Materials Engineering, Advanced Composites

The functionally graded material (FGM) are combination of ceramic and metal and hence exhibit properties such that FGM becomes suitable for the conditions where high temperature environment is prevailing. The combination of the FGM is governed by the material variation which is done by following certain laws of material distribution such as Power law, Sigmoid law, Exponential law etc. The analysis of FGM under thermal and thermomechanical loadings have been important aspect for scientists in emerging areas of research. It is important to have response of FGM plates in the conditions of thermal and thermomechanical environment. In the current work, FEM is used to model FGM plate and non dimensional deflection, stress and strain are computed in the condition of variable thermal environment. The results are compared for P-FGM, S-FGM and E-FGM.

- by Dr Manish Bhandari
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- Advanced Composites