Search results for " progettazione."

showing 10 items of 503 documents

A quantitative investigation on the thermoelastic effect of CFRP laminates

2009

The thermoelastic effect on CFRP laminates with various lay-ups is investigated. A thick low crimp unidirectional fabric reinforcement is adopted. The measured thermoelastic signal is compared with predictions from two analytical models based on the meso-mechanical bulk properties of the lamina and on assuming a strain witness behaviour of the surface resin rich layer.

Laminates theorySettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineCarbon Fibre Reinforced Plastics Laminates Theory Thermoelastic Stress AnalysisCarbon fibre reinforced plastics; Laminates theory; Thermoelastic stress analysisThermoelastic stress analysisCarbon fibre reinforced plastics
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STUDIO DI UN’APPLICAZIONE IN CAMPO AERONAUTICO DI COMPOSITI STRUTTALI IBRIDI RESISTENTI AL FUOCO

2013

In the aeronautical/aerospace structural design the increasing demands of materials having high mechanical performance, has led to the a wide use of Polymeric Matrix Composites (PMCs) mainly reinforced by carbon fibers (Carbon Fiber Reinforced Plastics, CFRP). The main drawbacks in the use of such composites are due to high sensitivity to environmental features and low working temperatures; moreover, these materials do not tolerate the fire exposure because of the inflammability of both the matrix and the fibers. In order to develop a composite that combines the structural performance of CFRP with a good strength to high temperatures and fire, in the present work the use of a hybrid composi…

Laminati ibridi compositi ceramici processo PICOM meccanica sperimentale.Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di Macchine
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SISTEMI VERDI COME CULTURA RIGENERATIVA: STRUMENTI E TECNOLOGIE

2021

The study analyzes and proposes in the historical and in the area immediately to it adjacent, the "values-nature" of the buildings through the creation of gardens wall and vertical gardens in the elevatiloy of non-monumental buildings. The study deepens in particular the specificity of the garden roof and the garden vertical, recognizing benefits and critical issues that distinguish these green systems for construction. It also deepens the concept of resilience in close relationship sustainability and regenerative design applied to the built environment. The theme of regenerative design is studied and promoted as an adaptive strategy at the design stage; it requires you to leave nature stre…

Lo studio analizza e propone nel centro storico e nell’area immediatamente ad esso adiacente la ”valori-naturazione” degli edifici attraverso la creazione di giardini pensili e di giardini verticali nei prospetti degli immobili non monumentali. Lo studio approfondisce in particolare le specificità del tetto giardino e del giardino verticale riconoscendo benefici e criticità che contraddistinguono questi sistemi verdi per l’edilizia. Si approfondisce inoltre il concetto di resilienza in stretta relazione alla sostenibilità e al regenerative design applicato all’ambiente costruito. Il tema del regenerative design viene studiato e promosso come strategia adattiva in fase di progettazioneesso richiede di lasciare che la natura rafforzi le sue capacità di autoguarigione e la sua integrità mediante l’uso di metodologie rigenerative integrate. Lo studio intende proporre una base su cui poter fondare ulteriori sviluppi scientifici sui sistemi di inverdimento esistenti o su brevetti in fase di sviluppo applicabili ai centri storici del territorio siciliano. Si prevede la redazione di un libretto divulgativo per gli abitanti volto alla disseminazione di una cultura del verde tecnologico ancora poco presente nei centri siciliani. Per quanto concerne le modalità attuative del progetto di ricerca sono state individuate: sia azioni orientate alla sensibilizzazione dei cittadini di Alcamo e dei residenti nella provincia sia l’individuazione di possibili forme di incentivazione per la mobilitazione di risorse private. Tale studio si inserisce nell’ambito di un filone di ricerca in itinere sui sistemi tecnologici di inverdimento per la costruzione di “Città parco” e di “Green hill” le cui linee guida e modalità attuative sono già state individuate dall’autrice per diversi comuni siciliani.Settore ICAR/12 - Tecnologia Dell'Architettura
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SURFACE AND MECHANISTIC PROPERTIES OF RECYCLED BITUMINOUS MIXTURES

2019

EXECUTIVE SUMMARY Problem Often, when the characteristics of a bituminous mixture are analised, there are major differences between in-lab and in-situ results. This is due to the fact that the procedures and techniques implemented during the design phase (in lab) may be different from those used on site. Then, is very important to be able to predict the main properties of a mixture particularly when innovative materials are used. For example, when crumb rubber is used, phisical and volumetric properties of mixes may change over time, in particular due to the swelling phenomenon that it alters different properties of the mixture (e.g., viscosity). This study aims to investigate the main aspe…

MICROTEXTUREVISCOSITY OVER TIMECRUMB RUBBERviscosità di masticiWORKABILITYproprietà meccaniche delle pavimentazioni stradalicompattabilità misceleLIFE CYCLE COST ANALYSISPAY ADJUSTMENTMASTIC VISCOSITYmicrotessiturametodi di progettazione di pavimentazioni stradaliCOMPACTABILITYRUTTINGpolverino di gommapenalitàproprietà superficiali delle pavimentazioni stradaliDRY PROCESSEXPECTED LIFESettore ICAR/04 - Strade Ferrovie Ed AeroportiKenPavegomma da pneumatici fuori usorigidezzaaggiustamento monetarioROAD SURFACE PROPERTIESM-EPDGMACROTEXTURESHORT-TERM OVEN AGINGROAD MECHANISTIC PROPERTIESSTIFFNESSAASHTO Guide 1993processo di compattazione interrottodeformazioni permanentiinvecchiamento a breve terminemacrotessituralavorabilità miscelevita attesaINTERRUPTED COMPACTION PROCESSanalisi del costo del ciclo di vitaPAVEMENT DESIGN METHODSSWELLING PHENOMENONMnPaveprocesso seccofenomeno di rigonfiamentomonitoraggio viscosità nel tempo
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Preliminary design of a magnetorheological brake for automotive use

2011

After an initial study of the characteristics of magnetorheological fluids based on a thorough search in literature, a preliminary configuration of MR brake is proposed. It comes from the evaluation of the main factors influencing the design of an appropriate magnetic circuit, and then the performance obtained in terms of brake torque. The analytical study of the brake has allowed a first preliminary sizing. Through the subsequent execution of an electromagnetic finite element model, created in ANSYS, it was possible to assess more accurately the distribution of the magnetic field inside the MR fluid and hence the resistance to relative motion between rotor and stator. The work needs an acc…

Magnetorheological fluidSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineMR brakeMagnetic FEM
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Haemodynamic predictors of a penetrating atherosclerotic ulcer rupture using fluid-structure interaction analysis

2013

We present preliminary data on the flow-induced haemodynamic and structural loads exerted on a penetrating atherosclerotic aortic ulcer (PAU). Specifically, one-way fluid-structure interaction analysis was performed on the aortic model reconstructed from a 66-year-old male patient with a PAU that evolved into an intramural haematoma and rupture of the thoracic aorta. The results show that elevated blood pressure (117 mmHg) and low flow velocity at the aortic wall (0.15 m/s(2)) occurred in the region of the PAU. We also found a low value of time-averaged wall shear stress (1.24 N/m(2)) and a high value of the temporal oscillation in the wall shear stress (oscillatory shear index = 0.13) in t…

Malemedicine.medical_treatmentHemodynamicsAorta ThoracicMedicineThoracic aortaHematomamedicine.diagnostic_testEndovascular ProceduresModels CardiovascularSettore ING-IND/34 - Bioingegneria IndustrialeAnatomyTreatment OutcomeAtherosclerosiCardiologyWall shear streCardiology and Cardiovascular MedicineBrief CommunicationsBlood Flow VelocityHumanPulmonary and Respiratory Medicinemedicine.medical_specialtyAortographyAortic RuptureAortic DiseasesAortographyBlood Vessel Prosthesis ImplantationSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchinePenetrating atherosclerotic ulcerPenetrating atherosclerotic ulcerInternal medicinemedicine.arteryFluid-structure interactionShear stressHumansArterial PressureComputer SimulationHemodynamicAortic ruptureUlcerAgedEndovascular Procedurebusiness.industryHemodynamicsStentmedicine.diseaseAtherosclerosisAortic DiseaseBlood pressureRegional Blood FlowSurgeryStress MechanicalbusinessTomography X-Ray Computed
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Reportage di bisogni inappagati: un'esperienza didattica del laboratorio di urbanistica allo ZEN

2008

Marginalità progettazione partecipata formazione reti sociali.
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Static strength and fatigue life of optimized hybrid single lap aluminum–CFRP structural joints

2017

Hybrid bolted/bonded joints are used to assemble structural components, commonly made by carbon fiber reinforced plastics (CFRP), with aluminum frames. Hence, they have become common solutions in a number of modern structural applications in the industrial fields, as well as civil constructions. Unfortunately, due to the lack of understanding of the relationships between the multiple parameters of influence that characterize their mechanical performance, only limited improvement have been achieved so far over classical bonding approaches, in terms of static and fatigue strength. As a result, further studies are needed in order to better exploit the potential of hybrid bolted/bonded joints a…

Materials Chemistry2506 Metals and AlloysMaterials scienceStatic strengthSurfaces Coatings and Filmchemistry.chemical_element02 engineering and technologydelaminationSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di Macchine0203 mechanical engineeringAluminiumMaterials Chemistrymedicinefinite element analysis (FEA)Mechanics of MaterialComposite materialSettore ING-IND/15 - Disegno E Metodi Dell'Ingegneria Industrialebusiness.industryChemistry (all)StiffnessSurfaces and InterfacesGeneral ChemistryStructural engineering021001 nanoscience & nanotechnologyStrength of materialsFatigue limitSurfaces Coatings and FilmsAdhesive joint020303 mechanical engineering & transportschemistryMechanics of MaterialsfatigueAdhesivemedicine.symptom0210 nano-technologybusinessSurfaces and Interfacestructural compositeThe Journal of Adhesion
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Infrared Thermography assisted evaluation of static and fatigue Mode II fracture toughness in FRP composites

2019

Abstract The work proposes the combined use of a Modified Transverse Crack Tension (MTCT) test coupon and Infrared Thermography, to evaluate the static and fatigue behaviour of Fibre Reinforced Polymer composites under Mode II delamination. Artificial delaminations starters are added to the TCT coupon, whose effects on the Strain Energy Release Rate are discussed. Infrared Thermography and Thermoelastic Stress Analysis are implemented to investigate stresses and delaminations growths on two FRP materials: a pre-preg IM7/8552 carbon fibre-epoxy and a glass-fibre reinforced epoxy laminates. The thermographic, thermoelastic and second harmonic signals have been obtained and used to monitor the…

Materials science/dk/atira/pure/subjectarea/asjc/2200/220502 engineering and technologyPolymer Matrix CompositeStress (mechanics)Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineThermoelastic dampingFracture toughness0203 mechanical engineeringThermoelastic Stress Analysis/dk/atira/pure/subjectarea/asjc/2500/2503Composite materialFatigueDelamination Fracture ToughneMode IICivil and Structural EngineeringStrain energy release ratePolymer Matrix CompositesDelamination Fracture ToughnessDelaminationEpoxyFibre-reinforced plastic021001 nanoscience & nanotechnology020303 mechanical engineering & transportsvisual_artThermographyvisual_art.visual_art_mediumCeramics and Composites0210 nano-technology
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Thermoelastic Stress Analysis of modified Transverse Cut Tensile composite specimens under pure Mode II fatigue delamination

2018

The present work investigates the behaviour of a Transvers Crack Tensile (TCT) specimen undergoing fatigue loading, by means of a Thermoelastic Stress Analysis (TSA) experimental setup. The TCT is a tensile composite specimen where a number of internal layers are cut through the beam width. The presence of such transverse notch favours the formation of interlaminar Mode II delaminations, starting from the notch tips and propagating between the cut and continuous plies. In this work, a modification is adopted to the classic TCT specimen, where insert films, mimicking artificial delaminations, are laid across the notch tips. This is done with the purpose to favour a pure Mode II and a symmetr…

Materials science/dk/atira/pure/subjectarea/asjc/2200/2205Composite number02 engineering and technologyEdge (geometry)Stress (mechanics)Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineThermoelastic damping0203 mechanical engineeringMaterials Science(all)Ultimate tensile strengthThermoelastic Stress AnalysisComposite materialFatigueEarth-Surface ProcessesDelamination Fracture ToughneMode IICivil and Structural EngineeringDelamination Fracture ToughnessMechanical EngineeringDelaminationFibre-reinforced plastic021001 nanoscience & nanotechnologyFibre Reinforced CompositeTransverse plane020303 mechanical engineering & transports/dk/atira/pure/subjectarea/asjc/2500Mechanics of MaterialsFibre Reinforced Composites/dk/atira/pure/subjectarea/asjc/2200/22100210 nano-technology/dk/atira/pure/subjectarea/asjc/2200/2211
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