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528 results on '"Bruschi, Stefania"'

2. Forming Quality Indices for Tube Roll Forming: Definition and Modelling

Author

Simonetto, Enrico, Wang, Qiaoling, Ghiotti, Andrea, Bruschi, Stefania, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Mocellin, Katia, editor, Bouchard, Pierre-Olivier, editor, Bigot, Régis, editor, and Balan, Tudor, editor

Published
2024
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45. Machining Effect On The Surface Integrity And SE Of Additively Manufactured And Heat-Treated Nitinol

Author

Bertolini, Rachele, Khademzadeh, Saeed, Ghiotti, Andrea, Bruschi, Stefania, Bertolini, Rachele, Khademzadeh, Saeed, Ghiotti, Andrea, and Bruschi, Stefania

Abstract

Nitinol belongs to the class of smart materials that have attracted the attention of researchers in recent decades due to their new promising industrial applications. Because of the austenite/martensite phase transformation, nitinol offers unique properties: superelasticity and shape memory effect. The former ability can be exploited for sensing, actuating, and damping applications. On the other hand, additive manufacturing of nitinol has started kicking off unimaginable applications exploiting the complexity-for-free characteristics offered by the 3D printing processes. Although stand-alone research on additive manufacturing of nitinol is available, the impact of different manufacturing steps, such as machining and heat treatment, on its superelasticity is severely lacking. This work used a powder bed fusion process using a laser beam to manufacture a Ni50.4Ti49.6 austenitic alloy, which was subsequently heat-treated at different aging temperatures. Subsequently, turning operations were carried out at varying cutting speeds under cryogenic cooling conditions. An in-depth characterization of the surface integrity and SE alterations induced by manufacturing was conducted before and after machining. The outcome of the work provides the best combination of heat treatment and machining parameters that allow for maximum surface integrity and SE. ., This work was finically supported by PNRR research activities of the consortium “iNEST (Interconnected North-Est Innovation Ecosystem)” funded by the European Union NextGenerationEU (Piano Nazionale di Ripresa e Resilienza (PNRR) – Missione 4 Componente 2, Investimento 1.5 – D.D. 1058 23/06/2022, ECS_00000043) and by the PRIN project “NEMESI - 4D manufacturing based on 3D printing and machining for Nitinol biomedical and sensing applications” funded by the Italian Ministry of University and Research (MUR).

Published
2024
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50. Tool wear and surface finish analysis after drilling Al-SiC metal matrix composite with DLC-coated tools at varying feed.

Author

Ghinatti, Edoardo, Bertolini, Rachele, Sorgato, Marco, Ghiotti, Andrea, and Bruschi, Stefania

Abstract

Metal matrix composites (MMCs) show enhanced mechanical and physical properties compared to monolithic alloys, which make them attractive for various engineering applications. However, their actual use in industry is limited due to their low machinability. The hard reinforcements present in the matrix may lead to high tool wear and poor surface integrity. In this context, the paper aims at studying the drillability of an Al-SiC MMC when using DLC-coated tungsten carbide tools at varying feeds. After the machining trials, a quantitative evaluation of the tool wear as well as the analysis of the hole surface roughness and damage was carried out. The results demonstrate that, at increasing feed, the tool wear, surface roughness, and surface defect density decrease, leading to the counterintuitive conclusion that increasing feed when drilling causes an increase in the MMC drillability. [ABSTRACT FROM AUTHOR]

Published
2024
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