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Brindisi Montagna, Italy

Pareo P.,Italian Institute of Technology | De Gregorio G.L.,Italian Institute of Technology | Manca M.,Italian Institute of Technology | Pianesi M.S.,TEUCO GUZZINI Spa | And 6 more authors.
Journal of Colloid and Interface Science | Year: 2011

Extremely lightweight plates made of an engineered PMMA-based composite material loaded with hollow glass micro-sized spheres, nano-sized silica particles and aluminum hydroxide prismatic micro-flakes were realized by cast molding. Their interesting bulk mechanical properties were combined to properly tailored surface topography compatible with the achievement of a superhydrophobic behavior after the deposition of a specifically designed hydrophobic coating. With this aim, we synthesized two different species of fluoromethacrylic polymers functionalized with methoxysilane anchoring groups to be covalently grafted onto the surface protruding inorganic fillers. By modulating the feed composition of the reacting monomers, it was possible to combine the hydrophobic character of the polymer with an high adhesion strength to the substrate and hence to maximize both the water contact angle (up to 157°) and the durability of the easy-to-clean effect (up to 2000. h long outdoor exposure). © 2011 Elsevier Inc. Source


Pappada S.,Consorzio CETMA | Rametta R.,Consorzio CETMA | Largo A.,Consorzio CETMA | Maffezzoli A.,University of Salento
Polymer Composites | Year: 2012

In this work, the behavior of hybrid composite plates, embedding superelastic shape memory alloy (SMA) wires, subjected to low-velocity impacts was studied. The impact experiments were performed on glass reinforced thermoset composite plates containing 1% by volume of superelastic thin wires (0.1 mm of diameter) of a SMA. The specimens were impacted with instrumented drop weight impact equipment: different dropping heights were used to attain impact energies from 1 to 500 J. The shape and size of damaged area were analyzed using two nondestructive inspection methods: (1) light scattering under back illumination was used to observe minor damages such as matrix cracks and fiber matrix debonding and (2) the size and shape of large damages such as delaminations were evaluated by infrared thermography. © 2012 Society of Plastics Engineers. Source


Maruccio C.,University of Salento | Bene P.,Consorzio CETMA | Gerardi A.,Consorzio CETMA | Bardaro D.,DAppolonia Lecce
Journal of the European Ceramic Society | Year: 2016

The paper discusses a new method to predict sintering deformation of complex ceramic components combining advanced nonlinear simulations and experimental results. Bending creep and dilatometric tests are used to fully characterize the complex material behavior and to determine the viscosity of vitreous china for sanitaryware as a function of relative density. The material model is then implemented into a USERMAT subroutine for the Ansys finite element program and the deformation of ceramic components of complex shapes during sintering is numerically simulated. Finally a method is developed and implemented in Ansys using the APDL language aiming to apply a subdivision algorithm to the final deformed mesh predicted through the finite element analysis. After the application of the subdivision algorithm, a smooth surface geometry of the ceramic component is obtained in a format suitable for manufacturing. © 2016 Elsevier Ltd. Source


Salomi A.,Consorzio CETMA | Salomi A.,TELCOM SpA | Greco A.,University of Salento | Pacifico T.,TELCOM SpA | And 2 more authors.
Advances in Polymer Technology | Year: 2013

Coupled polymer/composite parts were obtained for adapting a bladder-molding technique previously developed for the production of hollow components with continuous fiber-reinforced thermoplastic matrix composites. The internal layer (bladder side) is made up of an unreinforced thermoplastic polymer, linear low-density polyethylene (LLDPE), and the external one (mold side) is made up of a thermoplastic matrix composite based on isotactic polypropylene (PP) and E-glass fabric. The adhesion between the two layers is achieved by applying pressure (<1 bar) through a silicone bladder. The composite/polymer interface was characterized by the evaluation of the interfacial shear strength (IFSS) (between composite and unreinforced polymer), flexural stiffness, and short-beam strength analysis. The experimental mechanical properties were compared with model results, derived on the assumption that perfect adhesion exists between the two layers. A good agreement between the predicted and experimental mechanical properties was observed. As indicated by double notch shear tests used for the IFSS evaluation, good adhesion between LLDPE and PP matrix composite was achieved during processing. The results reported confirm the suitability of the method for a double-layer structure fabrication. © 2011 Wiley Periodicals, Inc. Source


Largo A.,Consorzio CETMA | Angiuli R.,Consorzio CETMA
RILEM Bookseries | Year: 2012

InfraRed Thermography (IRT) is a wireless, contactless and smart technique potentially suitable for the qualitative and/or quantitative buildings long-term monitoring. However, the monitoring of a particular object/defect in a masonry structure can succeed only if the thermographic survey is performed with a suitable experimental setup, defined after a specific laboratory calibration, leading to the proper definition of the operational parameters (active/passive approach, distances, time-windows, etc.). The aim of this document is to describe the advanced testing of "leccese" stone masonry samples, in order to evaluate the effectiveness of IR thermography to qualitatively detect defects and inhomogeneities (voids, irregular mortar joints, wooden and metallic inclusions) inside masonry textures or behind plaster layers, as well as evaluating the capacity of IR thermography to detect the beginning of material deterioration and its long term evolution. At the end of the experimental work the calibration of an infrared technique to be used for the NDT of historic structures was defined, by identifying the best set of operative parameters. © RILEM 2013. Source

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