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Cascina, Italy

Pappada S.,Consorzio CETMA | Salomi A.,Consorzio CETMA | Montanaro J.,Consorzio CETMA | Montanaro J.,University of Salento | And 3 more authors.
Aerospace Science and Technology | Year: 2015

In this work, the experimental and numerical study of induction welding devoted to the fabrication of a composite stiffened panel, representative of a typical aeronautic sub-component, is presented. Athermoplastic matrix composite, polyphenylene sulfide(PPS) reinforced with carbon fibers, is used. The influence of the fundamental process parameters, such as generator power, distance between induction coil and laminate, coil geometry and laminate lay-up on the heating rate and the heat distribution was analyzedapplying finite element simulations. The model was validated through the comparison of experimental and model results obtained in static experiments. Optimized parameters for composites welding were found out, and the mechanical properties of the welded joints were evaluated by single lap shear and pull-offexperiments. Finally, a prototype panel made of a flat laminate stiffened with four "L" shaped stringers is fabricated by continuous induction welding, exploiting modeling and experimental results. A C-scan of the panel was also performed. © 2015 Elsevier Masson SAS. All rights reserved. Source

Goulos I.,Cranfield University | Pachidis V.,Cranfield University | D'Ippolito R.,Lms International | Stevens J.,National Aerospace Laboratory Netherlands | Smith C.,Agusta Westland
Proceedings of the ASME Turbo Expo | Year: 2012

This work focuses on the development and application of a generic methodology targeting the design of optimum rotorcraft operations in terms of fuel burn, gaseous emissions and ground noise impact. An integrated tool capable of estimating the performance and emitted noise of any defined rotorcraft configuration within any designated mission has been deployed. A comprehensive and cost-effective optimization strategy has been structured. The methodology has been applied to two generic - baseline missions representative of current rotorcraft operations. Optimally designed operations for fuel burn, gaseous emissions and ground noise impact have been obtained. A comparative evaluation has been waged between the acquired optimum designs. The respective trade-off arising from the incorporation of flight paths optimized for different objectives has been quantified. Pareto front derived models for fuel burn and emitted noise have been structured for each mission. The Pareto models have been subsequently deployed for the design of operations optimized in a multidisciplinary manner. The results have shown that the proposed methodology is promising with regards to achieving simultaneous reduction in fuel burn, gaseous emissions and ground noise impact for any defined mission. The obtainable reductions are found to be dependent on the designated mission. Finally, the potential to design optimum operations in a multidisciplinary fashion using only a single design criterion is demonstrated. Copyright © 2012 by ASME. Source

Belsanti L.,European Commission - Joint Research Center Ispra | Belsanti L.,National Research Council Italy | Forchin E.,Agusta Westland | Stifanese R.,National Research Council Italy | And 2 more authors.
Metallurgia Italiana | Year: 2016

Coating systems protect metal substrates from environmental corrosion attack. However, although having good performances, the presence of specific metal ions in their composition represents a potential source of environmental contamination. The necessity to conciliate corrosion protection with environmental impact is, thereby, primary. This work was designed to study the performance of low environmental impact conversion coatings (surface pre-treatment and high-solids epoxy primer), such as those free from hexavalent chromium (Cr VI), layered on different substrates of aluminium alloy [Al 7075 (T6) unclad and Al 2024 (T3) unclad] widely used in aerospace applications. Substrate surfaces were first treated by environmentally friendly Cr-free products. Successively, on pre-treated substrates, high-solids, chromate-free epoxy primer was applied. The capability to protect substrates from corrosion phenomena was evaluated following exposure of 4 groups of samples to in situ marine atmosphere at the Genoa Experimental Marine Station (G.EM.S.) of C.N.R.-I.S.MAR., located in the port of Genoa, for 8, 16, and 24 months and in accordance with UNI EN ISO 8565:1997 Standard. Accelerated degradation of conversion coating was also studied by electrochemical impedance spectroscopy. To characterize the coating systems, the interface metal substrate/conversion coating, sections from different samples were submitted to microscope techniques. The experimental results reported in this paper give useful information regarding the protective power against substrate corrosion of some Cr-free conversion coatings that have, as compared to traditional Cr VI containing products, a lower impact on workers' health and on the environment. Source

Martarelli M.,Biomedical University of Rome | Santolini C.,Marche Polytechnic University | Perazzolo A.,Agusta Westland | Castellini P.,Marche Polytechnic University
Conference Proceedings of the Society for Experimental Mechanics Series | Year: 2012

Damping and loss factor assessment of high damped materials is a challenging task addressed in the past by several researchers, one of the most important is H. Oberst who defined a standard method to tackle the issue. In this paper a sandwich beam composed of two aluminium layers separated by the damping material has been studied. First the beam made only of aluminium layer has been tested and then the composite beam has been assembled by using as damping layer a sheet of styrene-butadiene rubber (SBR). The highly damped behaviour of the test sample makes the test very difficult; great care must be taken in the setting up the test itself. In particular the excitation system has been studied in depth by comparing the results obtained with a traditional non-contact impact test and an electro-dynamic system. Being the impact excitation invasive as well when considering light structures as the object under test, a non-contact electro-magnetic system has been developed in order to limit the influence of the excitation device on the structure behaviour. © The Society for Experimental Mechanics, Inc. 2012. Source

News Article
Site: http://www.materialstoday.com/news/

The controllers are supplied for use within the aviation and composites industries to provide temperature control for the manufacture and repair of adhesive bonded components. The Novatech HBC-4301A features ontrol of 1 to 6 heated zones, modular flexibility, inputs for up to 32 K or J type thermocouples, operation of two independent jobs from one unit, an adhesive maintenance program offering automatic adhesive cure time setting, vacuum and positive pressure monitoring and control, repair map design and simple configuration of the thermocouples/zones. This is the second set of equipment supplied to the IMP Group for use on the Cormorant (CH-149) Helicopter.  Used for rectification of structure and windscreen replacements, the HBC-4301A is approved by the Agusta Westland/Finmeccanica Group to cover all aspects of repair on this aircraft. This story uses material from JRT, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.

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