Search results for " Steel"

showing 10 items of 244 documents

Analysis of stamping performances of dual phase steels: A multi-objective approach to reduce springback and thinning failure

2009

The industrial interest on light weight components has contributed in the last years to a significant research effort on new materials able to guarantee high mechanical properties, good formability and reasonable costs together with reduced weights when compared to traditional mild steels. Among such materials advanced high strength steels (AHSS) such as transformations induced plasticity (TRIP) and dual phase (DP), and light weight alloys proved their usefulness in stamping of automotive components. As AHSS are concerned, one of the main drawbacks is related to springback occurrence. Many aspects have to be taken into account when springback reduction is investigated: material behavior iss…

Sheet stamping optimization Dual phase steels SpringbackMaterials scienceDual-phase steelbusiness.industryAutomotive industryFormabilityMinificationResponse surface methodologyStructural engineeringStampingReduction (mathematics)businessBlankMaterials & Design
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Effect of surface treatment with sandblasting and Er,Cr:YSGG laser on bonding of stainless steel orthodontic brackets to silver amalgam

2011

Objectives: Satisfactory bonding of orthodontic attachments to amalgam is a challenge for orthodontists. The aim of this in vitro study was to compare the shear bond strength of stainless steel orthodontic brackets to silver amalgam treated with sandblasting and Er,Cr:YSGG laser. Study Design: Fifty-four amalgam discs were prepared, polished and divided into three groups: In group 1 (the control group) the premolar brackets were bonded using Panavia F resin cement without any surface treatment; in groups 2 and 3, the specimens were subjected to sandblasting and Er,Cr:YSGG laser respectively, before bracket bonding. After immersing in distilled water at 37°C for 24 hours, all the specimens w…

SilverMaterials scienceOrthodontic BracketsDentistryLasers Solid-StateDental bondingengineering.materialDental Amalgamlaw.inventionstomatognathic systemlawMaterials TestingStereo microscopePremolarmedicineComposite materialGeneral Dentistrybusiness.industryBracketDental Bondingtechnology industry and agricultureStainless SteelLaser:CIENCIAS MÉDICAS [UNESCO]Shear bondAmalgam (dentistry)Orthodontic bracketsmedicine.anatomical_structureOtorhinolaryngologyUNESCO::CIENCIAS MÉDICASDental EtchingengineeringResearch-ArticleLaser in DentistrySurgerybusiness
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Numerical modeling of the solid-state sintering at the microstructural level: Multiphysics approach and application to metal additive manufacturing

2023

Numerical modeling of the solid-state sintering at the microstructural level: Multiphysics approach and application to metal additive manufacturing

Solid[SPI] Engineering Sciences [physics]finite element methodmicrostructure evolutionmultiphysics couplingmetal additive manufacturingstate sinteringstain steel 316L.
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CORROSION RESISTANCE OF DIFFERENT STAINLESS STEEL GRADES IN FOOD AND BEVERAGE INDUSTRY

2020

Stainless steel EIS XPS Passivity Transpassivity Food industry Ions release ICP-OES Polarization resistance Passive films Chromium Duplex Austenitic Photoelectrochemistry Biofilm NaClO Cleaning Disinfection Corrosion resistance Mott-Schottky Corten Carbon steelSettore ING-IND/23 - Chimica Fisica Applicata
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Stress transfer mechanism investigation in hybrid steel trussed-concrete beams by push-out tests

2014

Abstract Results of push-out tests carried out on Hybrid Steel Trussed–Concrete Beams (HSTCBs) before and after the concrete casting are presented and interpreted. Firstly, in order to check the ability of weldings before casting, tensile tests were performed on specimens reproducing different types of welded joints. Simplified design formulae were used to predict their ultimate strength. Secondly, results obtained by push-out tests on specimen representative of the beam before and after the concrete casting are presented and discussed. Finally, simplified analytical models proposed by the current European building code were adapted to the specific typology to roughly predict the ultimate s…

Stress transferring mechanismEngineeringConcrete beamsWelded jointsWeldinglaw.inventionStress (mechanics)lawHybrid steel trussed–concrete beamsTransfer mechanismUltimate tensile strengthHybrid steel trussed–concrete beamCivil and Structural Engineeringbusiness.industryMetals and AlloysAnalytical modellingBuilding and ConstructionStructural engineeringHybrid steel trussed–concrete beams; Welded joints; Push-out tests; Stress transferring mechanism; Analytical modellingPush-out testSettore ICAR/09 - Tecnica Delle CostruzioniPush-out testsMechanics of MaterialsBuilding codeCasting (metalworking)Welded jointbusinessBeam (structure)
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FEM analysis of push-out test response of Hybrid Steel Trussed Concrete Beams (HSTCBs)

2015

Abstract Aiming to investigate the steel truss–concrete stress transfer mechanism in Hybrid Steel Trussed–Concrete Beams (HSTCBs), a three-dimensional (3D) nonlinear Finite Element (FE) model is developed. The constitutive relationship of the steel composing the plates and the rebars is modeled by means of a quadri-linear law, while the concrete behavior is defined by means of a Concrete Damaged Plasticity (CDP) model, suitable for modeling concrete and brittle materials. Two main failure mechanisms are considered, namely the tensile cracking and the compressive crushing. In order to accurately grasp the complicate dowel and bond phenomena arising at the steel–concrete interface, a 3D solid…

Stress transferring mechanismMaterials scienceShear connectionTrussDowelPlasticityExperimental push-out testsStress (mechanics)BrittlenessHybrid steel trussed–concrete beamsMechanics of MaterialHybrid steel trussed-concrete beamExperimental push-out tests; Finite Element model; Hybrid steel trussed-concrete beams; Shear connection; Stress transferring mechanism; Building and Construction; Civil and Structural Engineering; Mechanics of Materials; 2506Civil and Structural EngineeringHybrid steel trussed–concrete beams Finite Element model Experimental push-out tests Stress transferring mechanism Shear connectionbusiness.industryMetals and AlloysExperimental push-out testBuilding and ConstructionStructural engineeringFinite element methodSettore ICAR/09 - Tecnica Delle CostruzioniCrackingHybrid steel trussed-concrete beamsMechanics of Materials2506Finite Element modelbusinessBeam (structure)Journal of Constructional Steel Research
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Limited Resistance Rigid Perfectly Plastic Hinges for Steel Frames

2017

The paper concerns the proposal of a new special device for steel frames that can be utilized as external constraint as well as internal one connecting the structure beam elements. The device is designed as a rigid perfectly plastic hinge characterized by suitably chosen stiffness and resistance. Its constituting material is steel. The elastic stiffness and the limit resistance, treated as independent of each other, are fixed with the aim of satisfying special features required to the structure. The proposed device is thought as a sandwich section with wing thickness appropriately variable. Its dimensions are designed so that it can exhibit the fixed independent stiffness and limit resistan…

Structural Devices Rigid Plastic Hinges Steel Structures Elastic Properties Limit ResistanceMaterials scienceResistance (ecology)business.industryComputational MechanicsHinge020101 civil engineering02 engineering and technologyBuilding and ConstructionStructural engineering0201 civil engineering020303 mechanical engineering & transports0203 mechanical engineeringMechanics of MaterialsArchitectureSettore ICAR/08 - Scienza Delle CostruzioniSafety Risk Reliability and QualitybusinessCivil and Structural EngineeringInternational Review of Civil Engineering (IRECE)
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Surface finish generated in hard turning of quenched alloy steel parts using conventional and wiper ceramic inserts

2006

Abstract Significant progress has already been achieved in green manufacturing including dry and hard, often high-speed, machining technologies. For instance, the demand for higher productivity has resulted in the wider application of ceramic and PCBN tools with special multi-radii (wiper) geometry. This paper reports some important characteristics of the surface roughness produced in the turning of a hardened low-chromium alloy steel using mixed alumina–titanium carbon (TiC) ceramic cutting tools equipped with both conventional and wiper inserts. The characteristic geometrical features of surfaces obtained in both these turning operations have been assessed by means of representative two-d…

Surface (mathematics)Engineering drawingBearing (mechanical)business.industryMechanical EngineeringAlloy steelSkewSurface finishengineering.materialIndustrial and Manufacturing Engineeringlaw.inventionMachininglawvisual_artengineeringSurface roughnessvisual_art.visual_art_mediumCeramicComposite materialbusinessInternational Journal of Machine Tools and Manufacture
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Integrazione di celle fotovoltaiche ibride nel vetromattone

2012

L’invenzione riguarda l’integrazione del vetromattone con celle solari ibride (organiche/inorganiche), conosciute come Dye-sensitized Solar Cell (DSC). La combinazione del vetromattone con le DSC consente di migliorare le prestazioni del prodotto originario rendendolo in grado di produrre energia pulita. Le caratteristiche di trasparenza e isolamento termo-acustico del prodotto possono essere regolate agendo sulla configurazione delle DSC. Il prodotto può essere assemblato a formare pannelli fotovoltaici per la realizzazione di facciate traslucide energeticamente “attive” in varie condizioni luminose (condizioni di luce diffusa o artificiale) e indipendentemente dall’angolo di radiazione so…

The integration of Dye-sensitized Solar Cell (DSC) with the glassblock is disclosed. The combination of the two technological elements the glassblock and the DSC module enhance their own peculiarities. The final complete product is ready-made for installation owns the qualities of the glassblock and produces sustainable energy at the same time. The transparency and the thermo-acoustic insulation may be modulated according to the specific requirements of each case of installation. The product may be used for example to create PV panels for glazed and translucent façades that are able to perform efficiently in all light conditions (even in diffuse light also converting internal artificial light) that are not dependant on the angle of the solar radiation and do not suffer from the high operative temperatures of functioning due to the peculiarities of the DSCs. DSCs are made of economic and biocompatible materials and are produced with low-cost and highly productive printing methods on rigid or flexible substrates. With the integration of DSC modules with the glassblock PV panels coincide with the envelope itself so that they do not need any further structures to be installed on and allow the possibility of subtract from the price of the panel the price of the substituted building element allowing further economies. DSCs can be printed in different colours and with various patterns offering to designers and customers the possibility of intervening on the glassblock aesthetical aspect also taking advantage of the peculiar modularity of the glassblock for larger compositions of drawings on the building’s façade. Seven Hypotheses of integration are discussed in order to obtain DSC-integrated glassblock ready for the construction of a precast and dry-assembled PV panel which can use the horizontal and vertical cavities between the glassblocks to house plastic profiles where the electric interconnections and the steel bars -useful for improve the mechanical resistance of the panel- are integrated.Settore ICAR/10 - Architettura Tecnica
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Pannello precompresso di vetromattoni assemblati a secco per la realizzazione di involucri traslucidi

2012

L’invenzione riguarda la realizzazione di un pannello di vetromattoni montati “a secco” -da impiegare per la realizzazione di involucri edilizi traslucidi anche nel caso di edifici alti- che è in grado di rispondere adeguatamente alle sollecitazioni orizzontali (quali quelle dovute a vento e sisma) grazie all’applicazione della tecnica della precompressione mondirezionale. Per offrire una risposta ai limiti imposti dalla tecnica di assemblaggio tradizionale dei vetromattoni (“ad umido”), l’applicazione della precompressione consente, infatti, di dare ai pannelli preassemblati “a secco” una rigidezza adeguata anche in direzione normale al loro piano di posa, sfruttando le buone caratteristic…

The invention is related to the construction of a glassblock panel “dry assembled” that can be used to build translucent building envelope even in high-rise buildings. This panel is able to contrast the horizontal actions due to wind and earthquake by means of the application of unidirectional pre-stressing technique. To overcame the limits due to the “wet assembly” system traditionally used to assemble the glassblocks the use of prestressing technique allow the panels to have an adequate mechanical resistance against the actions perpendicular to their installation plane. In this configuration the mechanical resistance of the glassblocks is exploited. The unidirectional prestressing (along the prevalent dimension of the panel) is obtained through the grip of the nuts inserted in the steel bars that are housed inside the glassblocks supporting profiles positioned in the vertical cavities between the glassblocks and passing through the horizontal profiles useful to separate glassblock rows from each other. The proper nuts grip opposing to the steel plates positioned at the top and bottom of the panel allow to prestress the panel. The steel plate are positioned on a plastic plate fixed to the lateral faces of the glassblocks by means of resins.Settore ICAR/10 - Architettura Tecnica
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