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Patent
Consorzio Cetma and Enea | Date: 2017-03-29

Modified pultrusion process finalized to the insertion of wired sensors or actuators in composite components (10) manufactured by pultrusion technique and device therefore.


Chionna F.,Consorzio CETMA | Cirillo P.,Consorzio CETMA | Palmieri V.,Consorzio CETMA | Bellone M.,Chalmers University of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

Increase the level of interaction with CAD engines constitutes a challenging problem for industries such as aerospace and automotive which require high degree of details inspection during the design process. A high level of interaction can be provided using immersive virtual environments. However, the use of virtual reality for industrial applications introduces a number of problems since interaction requires tracking systems but also the design of user-friendly 3D interfaces. Our work aims to develop a cost-effective hardware/software VR platform which increases the level of interaction, interfacing with the most common CAD engines. On one hand, the realization of such a complex platform requires high performance devices. On the other hand, industrial applications require reliable and cost-effective solutions and, for this reason, the presented platform features a novel solution for the accurate hand tracking which combines a depth camera and the WiiRemote in this concern. © 2015, Springer International Publishing Switzerland.


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.


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.


Angiuli R.,Consorzio CETMA | Corvaglia P.,Consorzio CETMA | Largo A.,Consorzio CETMA | Coricciati A.,Consorzio CETMA
Key Engineering Materials | Year: 2015

Masonry structures, both historic and newly built, often need reinforcement interventions to meet new or increased loads or in the case of adjustment against seismic actions. The result of this type of intervention must be verified or tested to ensure the correspondence between what was originally designed and what was realized. In addition to numerous destructive and semi-destructive techniques, infrared thermography (IRT) is a contactless diagnostic technique which can rapidly provide information about the success of such reinforcement interventions, even on masonry structures. In the present work an experimental campaign to evaluate the effectiveness of IRT in identifying different types of defects that can be found on different reinforcement systems (FRP, Fibre-reinforced plastic, or FRCM, Fibre Reinforced Cementitious Matrix) for masonry structures has been performed. A thermographic survey was repeated even after repair works on the defects in order to identify a procedure of acceptance that can also be used on areas subject to total or partial repair. © (2015) Trans Tech Publications.


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.


Tinti A.,Consorzio CETMA | Tarzia A.,Consorzio CETMA | Passaro A.,Consorzio CETMA | Angiuli R.,Consorzio CETMA
Applied Thermal Engineering | Year: 2014

The dispersion process of a micro-encapsulated phase change material (n-tetradecane) into a polyurethane foam was studied in order to develop a micro-composite insulating material with both low thermal conductivity and latent heat storage properties. The maximum weight content of micro-capsules added to the cellular matrix was 13.5%. Dynamic thermal properties of hybrid foams were investigated by means of a thermographic analysis. This was found to be a very effective diagnostic technique in detecting the change in heat transfer rate across the micro-composite foam in an indirect way, i.e. by measuring how the surface temperature changes over time under heat irradiation. Such a material would be of interest in the field of transport of perishable goods, particularly those requiring a controlled regime of carriage/storage temperatures. © 2014 Elsevier Ltd. All rights reserved.


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.


Patent
Consorzio Cetma | Date: 2012-05-09

System including at least one shape memory alloy based device (1) and at least one metal chain (6) assembled to each other in series, applicable in building industry to thrusting structures, able to optimize the response of the above mentioned chain to thrusting loads and subjected to external undesirable thermal and/or seismic effects.


The present invention relates to the development of a numerical-experimental methodology to study the viscous behavior of solid materials and to assess the material viscosity characterized by an ad hoc experimental test configuration and a numerical simulation of the experimental test to determine the material viscosity as a function of temperature.

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