The Experts below are selected from a list of 855 Experts worldwide ranked by ideXlab platform
Zuccarello B. - One of the best experts on this subject based on the ideXlab platform.
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CARATTERIZZAZIONE ALL’IMPATTO DI COMPOSITI IBRIDI CARBONIO-ARAMIDE USATI PER LA REALIZZAZIONE DI COMPONENTI DI AUTOVETTURE SPORTIVE
2020Co-Authors: Militello C., Epasto G., Bongiorno F., Zuccarello B.Abstract:Through a systematic experimental analysis, the impact characterization of carbon-aramid hybrid composites, typically used in the automotive sports field, has been performed. CFRP laminates object of this study have been produced by adding a hybrid foil obtained using a fabric of twill type, so-called carbon-Kevlar. In order to highlight the effects of hybridisation, that is, the different properties of Kevlar Fibre with respect to carbon, a comparative analysis was also carried out considering a CFRP laminate with the same lay-up. The analysis of the experimental results obtained through preliminary tensile tests and subsequent low-velocity drop-weight impact tests integrated with x-ray tomography, showed that although the hybrid composite has a lower static strength than the simple CFRP, it has an increase in impact strength of up to 50%, combined with an appreciable increase in maximum impact force and mainly in resistance to surface damage
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CARATTERIZZAZIONE ALL\u2019IMPATTO DI COMPOSITI IBRIDI CARBONIO-ARAMIDE USATI PER LA REALIZZAZIONE DI COMPONENTI DI AUTOVETTURE SPORTIVE
2020Co-Authors: Militello C., Epasto G., Bongiorno F., Zuccarello B.Abstract:Through a systematic experimental analysis, the impact characterization of carbon-aramid hybrid composites, typically used in the automotive sports field, has been performed. CFRP laminates object of this study have been produced by adding a hybrid foil obtained using a fabric of twill type, so-called carbon-Kevlar. In order to highlight the effects of hybridisation, that is, the different properties of Kevlar Fibre with respect to carbon, a comparative analysis was also carried out considering a CFRP laminate with the same lay-up. The analysis of the experimental results obtained through preliminary tensile tests and subsequent low-velocity drop-weight impact tests integrated with x-ray tomography, showed that although the hybrid composite has a lower static strength than the simple CFRP, it has an increase in impact strength of up to 50%, combined with an appreciable increase in maximum impact force and mainly in resistance to surface damage
Denis P Dowling - One of the best experts on this subject based on the ideXlab platform.
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fabrication of continuous carbon glass and Kevlar Fibre reinforced polymer composites using additive manufacturing
Additive manufacturing, 2017Co-Authors: Andrew N. Dickson, James N Barry, Kevin Mcdonnell, Denis P DowlingAbstract:Abstract This study evaluates the performance of continuous carbon, Kevlar and glass Fibre reinforced composites manufactured using the fused deposition modelling (FDM) additive manufacturing technique. The Fibre reinforced nylon composites were fabricated using a Markforged Mark One 3D printing system. The mechanical performance of the composites was evaluated both in tension and flexure. The influence of Fibre orientation, Fibre type and volume fraction on mechanical properties were also investigated. The results were compared with that of both non-reinforced nylon control specimens, and known material property values from literature. It was demonstrated that of the Fibres investigated, those fabricated using carbon Fibre yielded the largest increase in mechanical strength per Fibre volume. Its tensile strength values were up to 6.3 times higher than those obtained with the non-reinforced nylon polymer. As the carbon and glass Fibre volume fraction increased so too did the level of air inclusion in the composite matrix, which impacted on mechanical performance. As a result, a maximum efficiency in tensile strength was observed in glass specimen as Fibre content approached 22.5%, with higher Fibre contents (up to 33%), yielding only minor increases in strength.
Militello C. - One of the best experts on this subject based on the ideXlab platform.
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CARATTERIZZAZIONE ALL’IMPATTO DI COMPOSITI IBRIDI CARBONIO-ARAMIDE USATI PER LA REALIZZAZIONE DI COMPONENTI DI AUTOVETTURE SPORTIVE
2020Co-Authors: Militello C., Epasto G., Bongiorno F., Zuccarello B.Abstract:Through a systematic experimental analysis, the impact characterization of carbon-aramid hybrid composites, typically used in the automotive sports field, has been performed. CFRP laminates object of this study have been produced by adding a hybrid foil obtained using a fabric of twill type, so-called carbon-Kevlar. In order to highlight the effects of hybridisation, that is, the different properties of Kevlar Fibre with respect to carbon, a comparative analysis was also carried out considering a CFRP laminate with the same lay-up. The analysis of the experimental results obtained through preliminary tensile tests and subsequent low-velocity drop-weight impact tests integrated with x-ray tomography, showed that although the hybrid composite has a lower static strength than the simple CFRP, it has an increase in impact strength of up to 50%, combined with an appreciable increase in maximum impact force and mainly in resistance to surface damage
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CARATTERIZZAZIONE ALL\u2019IMPATTO DI COMPOSITI IBRIDI CARBONIO-ARAMIDE USATI PER LA REALIZZAZIONE DI COMPONENTI DI AUTOVETTURE SPORTIVE
2020Co-Authors: Militello C., Epasto G., Bongiorno F., Zuccarello B.Abstract:Through a systematic experimental analysis, the impact characterization of carbon-aramid hybrid composites, typically used in the automotive sports field, has been performed. CFRP laminates object of this study have been produced by adding a hybrid foil obtained using a fabric of twill type, so-called carbon-Kevlar. In order to highlight the effects of hybridisation, that is, the different properties of Kevlar Fibre with respect to carbon, a comparative analysis was also carried out considering a CFRP laminate with the same lay-up. The analysis of the experimental results obtained through preliminary tensile tests and subsequent low-velocity drop-weight impact tests integrated with x-ray tomography, showed that although the hybrid composite has a lower static strength than the simple CFRP, it has an increase in impact strength of up to 50%, combined with an appreciable increase in maximum impact force and mainly in resistance to surface damage
Navin Chand - One of the best experts on this subject based on the ideXlab platform.
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Influence of steady shear flow on dynamic viscoelastic properties of un-reinforced and Kevlar, glass Fibre reinforced LLDPE
Bulletin of Materials Science, 2004Co-Authors: Takeshi Kitano, S. A. R. Hashmi, Navin ChandAbstract:An experimental study was conducted to observe the effects of parallel-superposed flow condition on viscoelastic properties of LLDPE, Kevlar Fibre reinforced LLDPE and hybrid of short glass Fibre and Kevlar Fibre reinforced LLDPE. Parallel-plate rheometer was employed for these tests. Rheological parameters such as loss modulus ( G″ ) and dynamic viscosity (η′) do not vary significantly on superposing steady state shear with oscillatory shear in the studied range of experiment at 185°C in un-reinforced LLDPE. Kevlar Fibre reinforced LLDPE and Kevlar/glass Fibre reinforced LLDPE showed significant changes in the flow behaviour under various sets of superposed conditions. Storage modulus ( G′ ), and G″ become highly sensitive to low oscillatory angular frequencies (ω) under superposed conditions. These curves show two different regions with increased ω value. At low ω values, parameters G′ and G″ change sharply reaching a certain value, thereafter, changes are moderate with increased ω. In case of η′ a maxima is observed, position of which, depends upon the value of steady shear rate. Maxima shifts towards higher frequencies with the increased steady shear rate.
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Influence of steady shear flow on dynamic viscoelastic properties of un-reinforced and Kevlar, glass Fibre reinforced LLDPE
2004Co-Authors: Takeshi Kitano, S. A. R. Hashmi, Navin ChandAbstract:Abstract. An experimental study was conducted to observe the effects of parallel-superpos d flow condition on viscoelastic properties of LLDPE, Kevlar Fibre reinforced LLDPE and hybrid of short glass Fibre and Kev-lar Fibre reinforced LLDPE. Parallel-plate rheometer was employed for these tests. Rheological parameters such as loss modulus (G) and dynamic viscosity (h¢) do not vary significantly on superposing steady state shear with oscillatory shear in the studied range of experiment at 185°C in un-reinforced LLDPE. Kevlar Fibre reinforced LLDPE and Kevlar/glass Fibre reinforced LLDPE showed significant changes in the flow behaviour under various sets of superposed conditions. Storage modulus (G¢), and G become highly sensitive to low oscillatory angular frequencies (w) under superposed conditions. These curves show two different regions with increased w value. At low values, parameters G ¢ and G change sharply reaching a certain value, there-after, changes are moderate with increased w. In case of h ¢ a maxima is observed, position of which, depends upon the value of steady shear rate. Maxima shifts towards higher frequencies with the increased steady shear rate
Krishna Shankar - One of the best experts on this subject based on the ideXlab platform.
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Effect of block copolymer nano-reinforcements on the low velocity impact response of sandwich structures
Composite Structures, 2014Co-Authors: Karthik Ram Ramakrishnan, Sandra Guerard, Philippe Viot, Krishna ShankarAbstract:Sandwich composites with Fibre reinforced plastic (FRP) facesheets have emerged as a major class of lightweight structural materials in a wide range of engineering fields including aerospace, automotive and marine structures. This is due to attractive mechanical properties such as high specific stiffness and high strength. However, sandwich structures are susceptible to damage caused by impact. The objective of this paper is to evaluate the dynamic response of sandwich composites based on Kevlar Fibre reinforced epoxy and Rohacell foam. The improvement in impact performance of these sandwich structures that can be achieved by the addition of nanoparticles in the resin matrix is investigated. Nanostrength, an acrylate triblock copolymer that self-assembles in the nanometer scale is added to the epoxy matrix. The effect of the nano-reinforcements on flat sandwich plates under low velocity impact is investigated at different scales. An instrumented drop tower setup is used for the low velocity impact tests of the sandwich plates with neat or nano-reinforced epoxy matrix, at different energies. The macroscopic response of the sandwich structure and the microscopic phenomena involved in dissipating the impact energy are identified and compared for sandwich plates with and without nanoparticles.
