Daniele Cortis
@home.infn.it
Laboratori Nazionali del Gran Sasso
Istituto Nazionale di Fisica Nucleare
RESEARCH, TEACHING, or OTHER INTERESTS
Engineering, Industrial and Manufacturing Engineering, Mechanical Engineering, Mechanics of Materials
Scopus Publications
Scopus Publications
Daniele Cortis, Daniela Pilone, Francesco Grazzi, Giovanni Broggiato, Francesca Campana, Donato Orlandi, Takenao Shinohara, and Oriol Sans Planell
Springer Science and Business Media LLC
E. MANCINI
Materials Research Forum LLC
Abstract. Selective Laser Melting (SLM) technology is an additive manufacturing (AM) technique that involves selective or localized melting of metallic powder bed by a high-intensity laser beam source. This technology is responsible for an induced anisotropy in the printed components: in fact, depending on the orientation of the part within the powder bed, different mechanical properties are usually obtained. It is also known that mechanical properties may depend on the rate of load application. This work studies the mechanical anisotropy induced by SLM technology on a 16MnCr5 case hardening steel subjected to high strain rate loading. A direct Split Hopkinson Bar was employed for testing. The Cowper-Symonds model was used to describe the material behavior at high strain rates for samples loaded in the building and in the normal to building directions.
Daniele Cortis, Daniela Pilone, Francesca Campana, Giovanni Broggiato, and Donato Orlandi
Elsevier BV
Daniele Cortis, Francesca Campana, Donato Orlandi, and Stefano Sansone
Springer Science and Business Media LLC
D. Orlandi and D. Cortis
AIP Publishing
. INFN “Gran Sasso National Laboratory” ( Laboratori Nazionali del Gran Sasso - LNGS) is the largest underground laboratory in the world devoted to neutrino and astroparticle physics. Internally, the Mechanics service is focused on design and manufacturing of complex devices for both nuclear and astroparticle physics research and industrial technology transfer. Among its activities there are: traditional and CNC machining, quality control, mechanical design, multi-physics simulations, reverse engineering, and Additive Manufacturing (AM) both for plastic and metallic materials. In the INFN context, it poses itself as a reference for Additive Manufacturing (AM), quality analysis and chemical characterization. Intense activities, often in collaboration with other international laboratories, universities, and industries, are ongoing in this field. The service is equipped with an L-PBF machine, based on the Selective Laser Melting (SLM) technology. Materials such as Copper (e.g., OFHC / 99.8%), Copper alloy (e.g., CuCrZr), Steel alloys (e.g., AISI 316L) and Aluminum alloys (e.g., SCALMALOY ® ) are currently used.
D. D’Angelo, A. Zani, F. Alessandria, A. Andreani, A. Castoldi, S. Coelli, D. Cortis, G. Di Carlo, L. Frontini, N. Gallice,et al.
AIP Publishing
The most discussed topic in direct search for dark matter is arguably the verification of the DAMA claim. In fact, the observed annual modulation of the signal rate in an array of NaI(Tl) detectors can be interpreted as the awaited signature of dark matter interaction. Several experimental groups are currently engaged in the attempt to verify such a game-changing claim with the same target material. However, all present-day designs are based on a light readout via Photomultiplier Tubes, whose high noise makes it challenging to achieve a low background in the 1-6 keV energy region of the signal. Even harder it would be to break below 1 keV energy threshold, where a large fraction of the signal potentially awaits to be uncovered. ASTAROTH is an R\\&D project to overcome these limitations by using Silicon Photomultipliers (SiPM) matrices to collect scintillation light from NaI(Tl). The all-active design based on cubic crystals is operating in the 87-150 K temperature range where SiPM noise can be even a hundred times lower with respect to PMTs. The cryostat was developed following an innovative design and is based on a copper chamber immersed in a liquid argon bath that can be instrumented as a veto detector. We have characterized separately the crystal and the SiPM response at low temperature and we have proceeded to the first operation of a NaI(Tl) crystal read by SiPM in cryogeny.
Daniele Cortis, Daniela Pilone, Giovanni Broggiato, Francesca Campana, Danilo Tatananni, and Donato Orlandi
Springer Science and Business Media LLC
D. Cortis, E. Mancini, D. Orlandi, D. Pilone, and M. Sasso
Elsevier BV
D Cortis, E Mancini, S Nisi, D Orlandi, P Di Stefano, M Utzeri, and M Sasso
IOP Publishing
Abstract CuCrZr alloy is used to produce actively cooled components for high heat flux elements of beamlines and for heat sink of plasma facing components in nuclear fusion devices such as ITER and DEMO. It has an excellent thermal conductivity and specific mechanical strength, together with a high electrical conductivity that is giving high push to its use. Recently, CuCrZr alloy was also considered as an attractive material for Additive Manufacturing, leading to extend its application in the field of strain rate studies. As a matter of fact, its strain rate dependency is playing an important role for vertical target plasma-facing units components uses as heat sink in the ITER divertor or as structural material for actively cooled plasma facing components. This paper describes the results obtained by quasi-static and dynamic compression tests carried out on CuCrZr specimens produced by laser Powder Bed Fusion (PBF), with Selective Laser Melting (SLM) technology. Quasi-static tests have been conducted by means a servo-hydraulic tensile machine, while a direct tension-compression split Hopkinson bar has been used to perform the tests at high strain rate. Since dedicated heat treatments are required to obtain optimal combination of strength, ductility, and conductivity, some of the specimens have been heated up to 560 – 580 °C for 4 – 5 h and then cooled in air. Eventually, the calibration of the most appropriate constitutive models for 3D-printed CuCrZr alloy deformed at high strain rate has been carried out by means an inverse analytical procedure.
Ilaria Caravella, Daniele Cortis, Luca Di Angelo, and Donato Orlandi
MDPI AG
Selective laser melting (SLM) is the most widely used laser powder-bed fusion (L-PBF) technology for the additive manufacturing (AM) of parts from metallic powders. The surface quality of the SLM parts is highly dependent on many factors and process parameters. These factors include the powder grain size, the layer thickness, and the building angle. This paper conducted an experimental analysis of the effects of SLM process parameters on the surface quality of CuCrZr cubic specimens. Thanks to its excellent thermal and mechanical properties, CrCrZr has become one of the most widely used materials in SLM technology. The specimens have been produced with different combinations of layer thickness, laser patterns, building angles, and scanning speed, keeping the energy density constant. The results show how different combinations of parameters affect the surface quality macroscopically (i.e., layer thickness, building angle, and scanning speed); in contrast, other parameters (i.e., laser pattern) do not seem to have any contributions. By varying these parameters within typical ranges of the AM machine used, variations in surface quality can be achieved from 10.4 µm up to 40.8 µm. These results represent an important basis for developing research activities that will further focus on implementing a mathematical/experimental model to help designers optimize the surface quality during the AM pre-processing phase.
Marco Sasso, Edoardo Mancini, Mattia Utzeri, Gianluca Chiappini, Daniele Cortis, Donato Orlandi, and Luca Di Angelo
Springer International Publishing
A. Zani, F. Alessandria, A. Andreani, A. Castoldi, S. Coelli, D. Cortis, D. D’Angelo, G. Di Carlo, L. Frontini, N. Gallice,et al.
IOP Publishing
Abstract ASTAROTH is a novel R&D project which aims at improving the physics reach of future direct dark matter detection experiments based on NaI(Tl) scintillating crystals. There is a strong need to test the long standing DAMA positive observation of an annual modulation that could be due to Dark Matter (DM), with the same target material and in a model independent way. ASTAROTH aim is the enhancement of the sensitivity to the annual modulation signal, compared with present technology, by lowering the detection energy threshold in order to observe sub-keV recoils for the first time. This can be achieved by reading the scintillation light from the NaI(Tl) crystals with arrays of Silicon PhotoMultipliers (SiPM), and placing the detectors in a cryogenic environment. SiPMs feature lower dark noise than Photomultiplier Tubes (PMTs) at T < 150 K and allow for higher light collection. The cooling medium is liquid Argon, as it is an excellent scintillator that can be instrumented to act as a veto against several backgrounds. Here we present the status of the ASTAROTH project, introducing the innovative design of the detector chamber that will be used for the demonstration of the technology. Then, we will show the preliminary results of our first ever measurements performed on a single NaI(Tl) crystal read out by one SiPM array in a cryogenic set-up cooled with liquid nitrogen.
Ilaria Rago, Marco Iannone, Francesco Marra, Maria Paola Bracciale, Laura Paglia, Donato Orlandi, Daniele Cortis, and Valerio Pettinacci
Springer International Publishing
Daniele Cortis, Alessandro Lalli, and Donato Orlandi
Springer International Publishing
F. Cioeta, D. Alesini, M. Ciambrella, D. Cortis, V. Lollo, M. Marongiu, A. Mostacci, L. Palumbo, V. Pettinacci, and A. Variola
Elsevier BV
D. Cortis, M. Bruner, and G. Malavasi
Elsevier BV