Search results for "Progettazione"

Analysis and optimization of hybrid double lap aluminum-GFRP joints

2014

In this paper a systematic investigation of the mechanical performance of hybrid double-lap Al-GFRP bonded-bolted joints, has been carried out by using experimental analyses and numerical simulations. In order to detect the optimal geometric configuration, as well as to highlight the contribution of adhesive and bolts, the results relative to hybrid joints have been compared with those of simply adhesively bonded and simply bolted joints. The experimental and numerical results have shown that by using the minimum overlap length provided from theory, the bolt leads to a significant decreasing of both the maximum shear and the maximum peel stresses in the adhesive layer and, consequently, the…

Numerical experimental analysis of hybrid double lap aluminum-CFRP joints

2015

Abstract Due to their reliability and ease of assembly, both the adhesively bonded and the mechanical joints are commonly used in different fields of modern industrial design and manufacturing, to joint composite materials or composites with metals. As it is well known, adhesively bonded joints are characterized by high stiffness and good fatigue life, although delamination phenomena localized near the free edges may limit their use, especially for applications where corrosive environments and/or moisture can lead to premature failure of the bonding. In these cases, a possible alternative is given by the well-known mechanical joints. On the contrary, these last joints (bolted, riveted) requ…

Stiffness and Reinforcement Effect of electrical Resistance Strain Gauges

2007

:  The increasing use of low-modulus materials, on which the reinforcement effect of the electrical resistance strain gauge is not negligible, has re-opened the research interest into this issue. This study deals with the evaluation of stiffness, and of the strain gauge Young's modulus involved in the estimation of both the global and the local reinforcement effect; the relationship between the strain gauge stiffness and the local reinforcement effect is also analysed. In particular, the experimental technique used to determine the stiffness of some commercial strain gauges is described. The results show that the strain gauge stiffness alone does not permit an accurate evaluation of the loc…

Mechanical Performance of CNT Fibres

2014

The initial strength hype over carbon nanotubes arose from predictions of the strength of individual graphene layers, encouraged by measurements of individual MWCNTs and SWCNT bundles in AFM. The challenge for fibres composed of carbon nanotubes (CNTs) is to translate the impressive properties of the individual carbon nanotubes into the fibres. Yarn-like fibres composed of carbon nanotubes made by the direct spinning process have been used as the subject of this study. There have been occasional observations of strengths greater than 5 N/tex, which have served to maintain the enthusiasm for on-going developments. Here, we will re-examine those reports in the context of the response of nanot…

STUDIO DELLE PROPRIETÀ MECCANICHE ED ELETTROMECCANICHE DI NANOCOMPOSITI E NANOFIBRE MEDIANTE APPROCCI NUMERICI

Novel non-destructive inspection techniques for laser powder deposition inspection

2013

A novel non-destructive testing (NDT) techniques for inspection of parts and components manufactured by Additive Manufacturing Processes (AMP), in particular Laser Metal Deposition (LMD), has been developed. LMD is a technology that has been maturing over the last 20 years and has found application in repair, coatings, hybrid build and 3D near net shape manufacture of small intricate parts that can be used in aero and automobile engines to improve efficiency. Currently this technology cannot be used to supply some of these parts because absence of flaws, which might be left in the component during manufacture, cannot be guaranteed. Today, quality is assessed by sample destructive testing, w…

The Recovery of the Optimal Damping Constant by the MRF Damper

2009

In this paper was studied a method to analyze the recovering of optimal damping constant because of temperature increasing in a shock absorber. The increasing on temperature leads to decreasing that constant by mean dynamic viscosity such to modify the dynamic behavior of a 2DOF system built-up by sprung and unsprung mass. A MagnetoRheological damper was designed according with the desired optimal damping constant once fixed temperature design. It was seen that the increasing of temperature this constant is lost. As MagnetoRheological-Fluids allows us to increase the viscosity, we use a control signal by a state feedback of reduced order to create a such magnetic induction field to recover …

Gli esercizi ADVP realizzati dal Liceo Imera

2009

Negli a. s. 2006-07 e 2007-08 sei consigli delle quarte classi dei licei palermitani, Altavilla, Croce, Einstein, Garibaldi, Imera e Regina Margherita, con la collaborazione di esperti e di ricercatori universitari, hanno sperimentato una concreta modalità di attuazione della didattica orientativa favorendo, attraverso l’apprendimento dei contenuti disciplinari, lo sviluppo e il potenziamento negli studenti delle capacità indispensabili per la formulazione di un realistico progetto formativo-professionale post-diploma. Il contributo presenta il lavoro realizzato dagli insegnanti del Liceo Classico Imera di Palermo che, con la collaborazione di esperti e di ricercatori universitari, hanno sp…

Design per i sistemi produttivi locali, quale risorsa per il potenziamento delle realtà dei Parco dell’Oreto

2007

Contributo scientifico ed alcune esplorazioni progettuali del Corso di Disegno Industriale di Santo Giunta.

Nei Luoghi del design. Azioni e interazioni

2008

Il testo raccoglie alcune riflessioni sulla definizione “Luogo” in relazione alla definizione di “Design” ambiguamente identificato con il termine “Industriale” quale connotazione imprescindibile della sua natura disciplinare. È nelle relazioni complesse tra i due termini: Luoghi e Design che si dispiegano i tre paragrafi del volume, veri filtri di lettura o “luoghi metaforici” per leggere la complessità in cui si trova ad operare oggi il design nel suo significato più ampio di progetto: Il primo filtro, che si avvale della coppia concettuale “astratto / concreto”, individua luoghi di relazioni tra strategie progettuali proprie della disciplina del design (sia legati ad artefatti comunicati…