Search results for "thermo-mechanic"

showing 9 items of 49 documents

On the thermo-mechanical loads and the resultant residual stresses in friction stir processing operations

2008

In friction stir welding and processing both a thermal flux and a mechanical action are exerted on the material determining metallurgical evolutions, changes in the mechanical behaviour and a complex residual stress state. In the paper, the metallurgical changes are examined through numerical simulation and experiments to highlight and distinguish the effects of thermal and mechanical loadings. A particular focus is made on the residual stresses generated during the stir processing of AA7075-T6 aluminium blanks. The predictions of FE model are validated by experimental measurements. Lastly, this paper presents an in-process quenching of the processed blanks for improved mechanical propertie…

QuenchingFriction stir processingMaterials scienceComputer simulationMechanical EngineeringMetallurgyThermo-mechanical Loadschemistry.chemical_elementFriction Stir ProcessingMicrostructureIndustrial and Manufacturing EngineeringHeat fluxchemistryResidual stressAluminiumFriction stir weldingCIRP Annals
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A statistical design of experiments for optimizing the MALDI-TOF-MS sample preparation of polymers. An application in the assessment of the thermo-me…

2011

[EN] The sample preparation procedure for MALDI-TOF MS of polymers is addressed in this study by the application of a statistical Design of Experiments (DoE). Industrial poly (ethylene terephthalate) (PET) was chosen as model polymer. Different experimental settings (levels) for matrixes, analyte/matrix proportions and concentrations of cationization agent were considered. The quality parameters used for the analysis were signal-to-noise ratio and resolution. A closer inspection of the statistical results provided the study not only with the best combination of factors for the MALDI sample preparation, but also with a better understanding of the influence of the different factors, individua…

Solucions polimèriquesEthylenePolymersAnalytical chemistryDegradation kineticsBiochemistryThermo-mechanical degradationSample preparation procedureAnalytical ChemistryMatrix (chemical analysis)chemistry.chemical_compoundDegradationGlycolsMatrix assisted laser desorption ionization time of flight mass spectrometryPolyethylene terephthalateMechanismsCationizationSample preparationRecyclingMechanical recyclingSpectroscopyPriority journalchemistry.chemical_classificationDithranolSignal to noise ratioPolyethylene terephthalateHydrolysisMultiple processingPolymerPoly (ethylene terephthalate)Potential reactionsInjection cyclesMAQUINAS Y MOTORES TERMICOSInductively coupled plasmaSimulationEthersMatrix-assisted laser desorption/ionization time-of-flightQuality parametersDesign of ExperimentsGlycol unitsSample preparationArticleEthyleneEnvironmental ChemistryPolyethylene terephthalatesMALDI TOF MSSignal noise ratioMass spectrometryMatrixTermoplàsticsSignal to noiseTransesterificationDegradation mechanismMatrix-assisted laser desorption/ionizationStatistical design of experimentsTransesterificationchemistryChemical engineeringOligomersDesorptionEthylene glycolControlled studyProcess optimizationAnalytica chimica acta
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Assessing the MALDI-TOF MS sample preparation procedure to analyze the influence of thermo-oxidative ageing and thermo-mechanical degradation on poly…

2011

[EN] Multiple processing by means of successive injection cycles was used to simulate the thermo-mechanical degradation effects on the oligomeric distribution of PLA under mechanical recycling. Likewise, an accelerated thermal ageing over PLA glass transition was performed in order to simulate its service life. MALDI-TOF MS was used for the analysis and the sample preparation procedure was assessed by means of a statistical Design of Experiments (DoE). The quality effects in use for the analysis were signal-to-noise ratio and Resolution. Different matrixes, analyte/matrix proportions and the use of NaTFA as cationization agent were considered. A deep inspection of the statistical results pr…

Solucions polimèriquesPolymers and PlasticsGeneral Physics and AstronomyTransesterificationsThermo-mechanical degradationSample preparation procedureMatrix (chemical analysis)DegradationMechanismsMaterials ChemistryCationizationMechanical recyclingSample preparationRepeating unitPoly(lactide)Signal to noise ratioChemistryMultiple processingDesign of Experiments (DoE)AnalytesInjection cyclesPolylactidesMAQUINAS Y MOTORES TERMICOSMatrix-assisted laser desorption/ionization-time-of-flight mass spectrometryGlass transitionDesign of experimentsGlass lasersThermo mechanicalMALDI TOF MSChromatographyMatrixMass spectrometrySignal to noiseTermoplàsticsOrganic ChemistryDegradation mechanismThermo-oxidative ageingStatistical design of experimentsMatrix-assisted laser desorption/ionizationInvestigation methodsMatrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS)Polylactide (PLA)AgeingOligomersDegradation (geology)DesorptionDeep inspectionExperimentsPoly(lactide)European Polymer Journal
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Study of the thermo-mechanical performances of the IFMIF-EVEDA Lithium Test Loop target assembly

2012

Abstract Within the framework of the IFMIF R&D program and in close cooperation with ENEA-Brasimone, at the Department of Energy of the University of Palermo a research campaign has been launched to investigate the thermo-mechanical behavior of the target assembly under both steady state and start-up transient conditions. A theoretical approach based on the finite element method (FEM) has been followed and a well-known commercial code has been adopted. A realistic 3D FEM model of the target assembly has been set-up and optimized by running a mesh independency analysis. A proper set of loads and boundary conditions, mainly concerned with radiation heat transfer between the target assembly ex…

Steady stateMaterials scienceIFMIF Target assembly Thermo-mechanicsMechanical EngineeringNuclear engineeringLithium testFinite element methodLoop (topology)Hydrostatic testNuclear Energy and EngineeringHeat transferGeneral Materials ScienceTransient (oscillation)Boundary value problemSettore ING-IND/19 - Impianti NucleariCivil and Structural EngineeringFusion Engineering and Design
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Numerical assessment of the thermomechanical behaviour of the DEMO Water-Cooled Lithium Lead inboard blanket equatorial module

2018

Abstract Within the framework of EUROfusion R&D activity, a research campaign has been carried out at the University of Palermo, in close cooperation with ENEA labs, in order to assess the thermo-mechanical performances of the DEMO Water-Cooled Lithium Lead (WCLL) inboard blanket equatorial module, whether properly integrated within its whole inboard segment. In particular, a detailed 3D model of this segment, including all the other modules, the back-supporting structure and the attachment system, has been considered in order to realistically simulate the boundary conditions affecting the equatorial module behaviour. The study has been focused on the investigation of the module thermo-mech…

Structural materialComputer scienceMechanical EngineeringNuclear engineeringThermo-mechanicBlanket01 natural sciencesFinite element method010305 fluids & plasmasStress (mechanics)WCLL blanketNuclear Energy and EngineeringCabin pressurizationLinearization0103 physical sciencesGeneral Materials ScienceMaterials Science (all)Boundary value problem010306 general physicsDEMOFEM analysiLoss-of-coolant accidentSettore ING-IND/19 - Impianti NucleariCivil and Structural EngineeringFusion Engineering and Design
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Analysis of the thermo-mechanical behaviour of IFMIF Target Assembly

2013

Target Assembly Thermo-mechanicsIFMIFNUCLEAR FUSION IFMIFSettore ING-IND/19 - Impianti Nucleari
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On the numerical assessment of the thermo-mechanical performances of the DEMO Helium-Cooled Pebble Bed breeding blanket module

2014

Within the framework of the European DEMO Breeder Blanket Programme, a research campaign has been launched by University of Palermo, ENEA-Brasimone and Karlsruhe Institute of Technology to theoretically investigate the thermo-mechanical behavior of the Helium-Cooled Pebble Bed (HCPB) breeding blanket module of the DEMO1 blanket vertical segment, under normal operation and over-pressurization loading scenarios. The research campaign has been carried out following a theoretical-computational approach based on the finite element method (FEM) and adopting a qualified commercial FEM code. A realistic 3D FEM model of the HCPB blanket module central poloidal-radial region has been developed, inclu…

ToroidSteady stateThermo-mechanicsMechanical EngineeringNuclear engineeringHCBP blanketThermo-mechanicchemistry.chemical_elementDEMO reactorThermo-mechanics;DEMO reactor;HCBP blanketBlanketFinite element methodCoolantBreeder (animal)Nuclear Energy and EngineeringchemistryThermalDEMO reactor HCBP blanket Thermo-mechanicsEnvironmental scienceGeneral Materials ScienceSettore ING-IND/19 - Impianti NucleariHeliumCivil and Structural Engineering
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Thermo-mechanical volume change behaviour of Opalinus Clay

2016

The paper examines the thermo-mechanical volume change behaviour of Opalinus Clay in relation to different stress conditions and overconsolidation ratio (OCR) values and evaluates the impact of temperature on some hydro-mechanical properties of this material. To this aim, a focused experimental campaign consisting in high-temperature/high-pressure oedometric tests has been carried out. The results show that the thermo-mechanical volume change behaviour of Opalinus Clay is heavily affected by the OCR: thermal expansion is found when the heating is carried out at high OCR, whereas irreversible thermal compaction is observed when heat is applied at a vertical effective stress that is sufficien…

Yield (engineering)Materials scienceConsolidation (soil)Settore ICAR/07 - GeotecnicaEffective stressGeo-energy0211 other engineering and technologiesCompactionModulus02 engineering and technology010502 geochemistry & geophysicsShaleGeotechnical Engineering and Engineering Geology01 natural sciencesThermal expansionThermo-mechanical behaviourThermalShalesCompressibilityGeotechnical engineeringOpalinus ClayNuclear waste storage021101 geological & geomatics engineering0105 earth and related environmental sciences
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Development and application of multiscale procedures for the thermomechanical analysis of the DEMO Water-Cooled Lithium Lead Breeding Blanket

2022

The Breeding Blanket is an essential component of the DEMO fusion reactor and its design is one of the pivotal purposes of the DEMO project. Indeed, this component has to withstand severe operating conditions, as it is directly exposed to the plasma, making its design particularly challenging. In particular, the Water-Cooled Lithium-Lead (WCLL) BB concept is one of the candidates currently considered for the conceptual design of the European DEMO reactor. The development of a robust BB system is crucial for the design of the whole DEMO reactor and the thermo-mechanical assessment of the whole BB segments is mandatory to allow checking their structural performances in different loading scena…

breeding blankets thermo-mechanics analysis procedureFEM analysisSettore ING-IND/19 - Impianti NucleariWCLL
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