1,721,130 research outputs found
Entrevista a Francesco Iacoviello
No full textREMOTE: Assessing and evaluating remote learning practices in STEM, projecte Erasmus finançat en el marc del programa Erasmus+; Projecte: Grant Agreement number: 2022-1-ES01-KA220-HED-000085829Prof. Francesco Iacoviello, Rector’s delegate for innovative teaching of the University of Cassino, answers the following questions: 1. How do you imagine the university of the future?, a. What teaching and assessment methodologies do you mostly imagine?, b. Which learning technologies do you think will prevail?; 2. How will the students of the future differ from those of today? (demands, expectations,...) and 3. How will online / remote assessment methodologies affect learning practices in STEM, differently depending on … the gender? (students / faculty), … the studies typology? and will it be different in STEM studies from the rest?7114_01.mp4
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Macro and microscopical approach to the damaging micromechanisms analysis in a ferritic ductile cast iron
No full textThe influence of the graphite nodules morphology (shape, dimension and distribution) on ductile cast irons (DCIs) mechanical properties is experimentally confirmed both in static, quasi static and cyclic loading conditions. According to the most recent results, these graphite elements cannot be merely considered as "microvoids embedded in a metal matrix", but their presence implies a modification of the damaging micromechanisms, depending on the metal matrix microstructure. In this work, a fully ferritic DCI has been investigated: tensile tests have been performed on notched mini tensile specimens. Specimens lateral surfaces have been observed by means of a Scanning Electron Microscope (SEM) during the tests ("in situ" tests) at different magnifications. Considering the results obtained at low magnification, quantitative image analysis has been applied in order to investigate the triaxiality evolution during the test. (C) 2013 Elsevier Ltd. All rights reserved
Sn and Ti influence in bending cracks path in hot dip galvanizing coatings
No full textHot dip galvanizing processing have remained almost unchanged since over 200 years, but in the last years the attention to environmental topics, leads new approach solution in classical protection techniques, introducing innovative way oriented to optimize different coating properties. Hot-dip galvanizing is a classical processing to generate coatings on iron-based, but many secondary metals added in the bath, for examples Pb important to fluidizing the bath, are dangerous for human health and sometimes is replaced by Sn. Hot dip zinc coated ipersandelin steel specimens were investigated in this work in order to identify the main damaging micromechanisms in intermetallic phases at three different bending angles, considering both chemical composition and intermetallic phases distribution influences.
Longitudinal sections of bended specimens were observed by means of a LOM (Light Optical Microscope) and main damage micromechanisms, identified as longitudinal and radial cracks was evaluated
Effetto del rame nei rivestimenti a base zn-ti: cinetiche di formazione delle fasi e caratterizzazione meccanica a flessione
No full textAnalysis of dissipated energy and temperature fields at severe notches of AISI 304L stainless steel specimens
Full text linkIn the last years, a large amount of fatigue test results from plain and bluntly notched specimens made of AISI 304L stainless steel were synthetized in a single scatter band by adopting the specific heat loss per cycle (Q) as a damage parameter. During a fatigue test, the Q parameter can be evaluated measuring the cooling gradient at a point of the specimens after having suddenly stopped the fatigue test. This measurement can be done by using thermocouples; however, due to the high stress concentration at the tip of severely notched components analysed in the present paper, an infrared camera achieving a much improved spatial resolution was adopted. A data processing technique is presented to investigate the heat energy distribution close to the notch tip of hot-rolled AISI 304L stainless steel specimens, having notch tip radii equal to 3, 1 and 0.5 mm and subjected to constant amplitude cyclic loads. A thermal finite element analysis was also performed by assigning heat generation in the appropriate region close to the notch tip. Then the numerical temperature values were compared with the experimental measurement
Image processing approach in Zn-Ti-Fe kinetic phase evaluation
No full textHot-dip galvanizing is one of the most used methods to apply zinc-based coatings on steels, in order to provide sacrificial protection against corrosion over all the steel surface. In the last years new alloying elements on the Zn bath are studied to optimize properties oriented to new market requirements. In this work a new approach is proposed in order to quantify the main morphological properties of an ZnTiFe phase rich in Ti, present only in coatings produced by baths containing Ti. No quantitative studies have been yet carried out on intermetallic phases formation as consequence of Ti addition in the Zn bath. The innovative approach for ZnTi-based coatings has been applied to five different dipping times, thus allowing to evaluate the kinetic of formation. © 2012 Taylor & Francis Group
Low Cycle Fatigue behaviour and anisotropy of two steels for turbogenerator coil retaining rings and rotors
No full textTurbogenerator rotors and coil retaining rings (CRR) are typically subjected to low cycle fatigue (LCF). The rotor contains uniformly spaced longitudinal slots, where copper conductors are packed: at the nominal speed of 3000 rpm a great centrifugal force acts on the copper conductors that must be restrained by CRRs, shrunk fitted onto the body over the coils. Thus, at each on-off transitory (10,000 – 15,000 in the whole machine life) both the rotor and the CRR are subjected to a cyclic load. Several contributions report the mechanical properties of the typically used steels for rotor and CRR manufacturing, but none deals with their characterization under LCF in strain controlled conditions, while investigations on the anisotropy were performed just on CRR steels in load controlled conditions. This research aims at determining the main parameters describing the LCF performance of two widely applied steels for rotors and CRRs, investigating also the anisotropy in the dynamic behaviour: for this purpose an extensive experimental campaign was carried out on specimens machined (in the tangential and radial directions) from prolongations of trial rotors and CRRs. An original approach was used for misalignment compensation, strain control and data recording, sensitivity analyses were finally performed on results
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