Fabrizio NiccoliCERN | CERN · Technology Department
Fabrizio Niccoli
Doctor of Philosophy
About
35
Publications
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2,481
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Introduction
Mechanical research engineer with expertise in mechanics of conventional and non-conventional materials, experimental and numerical techniques in solid mechanics, modelling of complex mechanical systems, structural damage propagation and fatigue analysis. His recent research and design activities are mainly focused on Shape Memory Alloys (SMAs) and their application in Ultra High Vacuum (UHV) systems. He currently works at CERN | Technology Department (TE).
Publications
Publications (35)
Shape Memory Alloys (SMAs) are becoming increasingly used in actuator technologies thanks to the generation of high specific power and reliability. These features are obtained by extremely simple architecture and actuation mechanisms that exploit the thermal-induced shape recovery properties of SMAs. Thanks to the high specific power, small diamete...
Shape memory alloy (SMA)-based fasteners and connectors represent a class of successful SMA components that are increasingly used especially in marine or aerospace applications. The present paper aims to investigate novel C-Shaped SMA connectors for room-temperature vacuum pipes within particle accelerators. The proposed connectors exhibit the two-...
Novel NiTi-based shape memory alloy (SMA) pipe couplers were designed and developed. They are suitable for room-temperature ultrahigh vacuum (UHV) systems and provide a quick and compact solution at reasonable cost. Their use is particularly interesting for restricted-access areas of particle accelerators as their installation/dismounting can be pe...
Recent studies on Shape Memory Alloy rings have been undertaken at the European Organization for Nuclear Research (CERN) to develop smart and leak-tight couplers for Ultra High Vacuum systems of particle accelerators. A special thermo-mechanical process (training) is needed to provide SMA rings with proper functional properties, that is to allow th...
A viable approach to solve inverse problems in elasticity is proposed. It is based on regression algorithms to estimate materials and/or loading parameters by fitting the experimentally-evaluated displacement field to representative analytical solutions.
Displacements are measured by the digital image correlation (DIC) technique and they are used...
Fatigue crack growth of austenitic and martensitic NiTi shape memory alloys was analyzed, with the purpose of capturing the effects of distinct stress-induced transformation mechanics in the two crystal structures. Mode I crack growth experiments were carried out, and near-crack-tip displacements were captured by in-situ digital image correlation (...
The general features of Shape Memory Alloys (SMAs) operating in constrained recovery mode were described. A particular focus was given to the fastening and connection systems of recent industrial and scientific interest such as the beam-pipe couplers for Ultra High Vacuum (UHV) systems of particle accelerators. Such bolt-free connectors find a vari...
In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider (FCC-hh), a highest-luminosity high-energy lepton collider (FCC-ee), the corresponding 100 km...
In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider (FCC-hh), a highest-luminosity high-energy lepton collider (FCC-ee), the corresponding 100 km...
In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider (FCC-hh), a highest-luminosity high-energy lepton collider (FCC-ee), the corresponding 100 km...
We review the physics opportunities of the Future Circular Collider, covering its e+e-, pp, ep and heavy ion programmes. We describe the measurement capabilities of each FCC component, addressing the study of electroweak, Higgs and strong interactions, the top quark and flavour, as well as phenomena beyond the Standard Model. We highlight the syner...
In response to the 2013 Update of the European Strategy for Particle Physics, the Future Circular Collider (FCC) study was launched, as an international collaboration hosted by CERN. This study covers a highest-luminosity high-energy lepton collider (FCC-ee) and an energy-frontier hadron collider (FCC-hh), which could, successively, be installed in...
The one-way and two-way shape memory effects (SMEs) as well as the thermal hysteresis represent fundamental properties when dealing with the design of detachable and thermally-stable connection systems based on shape memory alloys (SMAs). Such properties can be induced and tuned by thermo-mechanical processes that include thermal treatments and sev...
In response to the 2013 Update of the European Strategy for Particle Physics, the Future Circular Collider (FCC) study was launched, as an international collaboration hosted by CERN. This study covers a highest-luminosity high-energy lepton collider (FCC-ee) and an energy-frontier hadron collider (FCC-hh), which could, successively, be installed in...
We review the physics opportunities of the Future Circular Collider, covering its e+e-, pp, ep and heavy ion programmes. We describe the measurement capabilities of each FCC component, addressing the study of electroweak, Higgs and strong interactions, the top quark and flavour, as well as phenomena beyond the Standard Model. We highlight the syner...
A new generation of shape memory alloy (SMA)-based coupling systems, for ultra-high vacuum (UHV) applications in particle in accelerators, is currently under investigation at the European organization for nuclear research (CERN). The use of such technology in some restricted-access radioactive areas within CERN accelerators could result in noticeab...
In response to the 2013 Update of the European Strategy for
Particle Physics (EPPSU), the Future Circular Collider (FCC) study
was launched as a world-wide international collaboration hosted by
CERN. The FCC study covered an energy-frontier hadron collider
(FCC-hh), a highest-luminosity high-energy lepton collider (FCC-ee),
the corresponding 100 km...
In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider (FCC-hh), a highest-luminosity high-energy lepton collider (FCC-ee), the corresponding 100 km...
In response to the 2013 Update of the European Strategy
for Particle Physics, the Future Circular Collider (FCC) study was
launched, as an international collaboration hosted by CERN. This
study covers a highest-luminosity high-energy lepton collider (FCCee) and an energy-frontier hadron collider (FCC-hh), which could,
successively, be installed in...
We review the physics opportunities of the Future Circular Collider, covering its e+e−, pp, ep and heavy ion
programmes.We describe the measurement capabilities of each FCC component, addressing the study of electroweak, Higgs
and strong interactions, the top quark and flavour, as well as phenomena beyond the Standard Model. We highlight the
synerg...
Low-to-high cycle fatigue behavior of a pseudoelastic NiTi SMA was analyzed. The evolution of both global and local strain were captured during fatigue tests. Local strains were measured in-situ by the digital image correlation (DIC) technique. Significant differences were observed at the two scales, due to the localized nature of stress-induced tr...
The ultrahigh-vacuum (UHV) coupling performance of NiTiNb shape memory alloy (SMA) rings was investigated by finite element (FE) simulations and experimental measurements. The contact pressure at the interface between the SMA ring and the vacuum pipe was measured and good agreements with the FE results were obtained. Furthermore, a design method wa...
Microstructural damage induced by fatigue mechanical loads in nickel-titanium (NiTi) based shape memory alloys is analyzed by instrumented indentation. To this aim, two indentation damage parameters have been defined, which are directly obtained from the force-penetration depth curve and describe the phase reversibility of the material under loadin...
Temperature dependent fracture properties of NiTi-based Shape Memory Alloys (SMAs), within the pseudoelastic regime, were analyzed. In particular, the effective Stress Intensity Factor (SIF) was estimated, at different values of the testing temperature, by a fitting of the William’s expansion series, based on Digital Image Correlation (DIC) measure...
Shape Memory Alloy (SMA) rings have been studied for possible applications as beam-pipe connectors in particle accelerators. The rings were analyzed by both experimental tests and finite element simulations. In particular, the tightening performance of NiTiNb rings, in terms of contact pressure and clamping/unclamping mechanisms, was studied for di...
A thermo-mechanical model to simulate the mechanical response of a shape memory alloy heat engine has been developed. In such a kind of engine, the thermally induced shape recovery capabilities of shape memory alloys are exploited to obtain mechanical work from low-grade energies, such as warm wastewater, geothermal, and solar sources. As a consequ...
In this study, adhesive joints made up of commercial NiTi sheets with shape memory capabilities are analyzed. Suitable surface pre-treatments, i.e., degreasing, sandblasting, and chemical etching, are pre-liminary compared in terms of surface roughness, surface energy, and substrate thinning. Results indicate that chemical etching induces marked su...
Shape memory alloys (SMA) provide unique functional features and several SMA-based heat engines have been proposed in recent years, exploiting the thermally induced recovery capabilities of such class of materials. These engines represent simple and environmentally-friendly solutions to obtain mechanical energy from low-grade energy sources, such a...
