Search results for "Orazio"
showing 10 items of 1348 documents
Influence of Joint Geometry on Micro and Macro Mechanical Properties of Friction Stir Spot Welded Joints
2014
AbstractSpot welding can be considered a very common joining technique in automotive and transportation industries as it permits to obtain effective lap-joints with short process times and what is more it is easily developed through robots and automated systems. Recently, Friction Stir Spot Welding (FSSW) has been proposed as a natural evolution of the already known Friction Stir Welding (FSW) process, allowing to obtain sound spot joints that do not suffer from the insurgence of typical welding defects due to the melting of the base material. Similarly to FSW, both geometrical and technological parameters must be considered as they affect the material flow and the heat flux generated durin…
Shear coefficient determination in linear friction welding of aluminum alloys
2015
In the present study, a combined experimental and numerical investigation on Linear Friction Welding (LFW) of AA2011-T3 aluminum alloy was carried out in order to find the temperature dependent shear coefficient to be used in a 3D numerical model of the process. Torque, oscillation frequency and pressure were acquired in order to calculate the shear stress at the interface. A numerical thermal model was used to calculate the temperature at the interface between the specimens starting from experimental temperatures acquired through a thermocouple embedded in the LFW specimens. Finally, the calculated shear coefficient was used to model the contact between the two specimens in a dedicated 3D,…
On the effectiveness of spif process to re-form end-of-life components as compared to conventional forming approach
2021
Manufacturing processes have a significant impact on global energy consumptions. The recovery of materials and functions for the implementation of the Circular Economy principle needs to be focused on either, by utilizing new techniques or the rethinking of old processes to rework End-of-Life (EoL) components. Previous researches have shown Single Point Incremental Forming (SPIF) process as a good alternative for sheet metal EoL components reuse by their reshaping. In this article, the authors aim to study the effectiveness of the SPIF processes by comparing its reshaping performance with other, more conventional forming processes. An initial Deep Drawing (DD) process was performed to imita…
Material Substitution for Automotive Applications: A Comparative Life Cycle Analysis
2012
Lightweight materials have become an important strategy in the automotive industry to enable vehicle weight reduction and reduce fuel consumption. However, when developing specific strategies, the overall benefits of any material should be analyzed throughout its life cycle to comprehend energy/environmental differences that arise during its processing and its final use. A key example is aluminum which despite having great potential in the use phase requires large amounts of energy to process. This paper provides a comparison between aluminum and steel utilizing a life-cycle approach. This approach reveals the importance of incorporating a recycling strategy to leverage aluminum’s low-weigh…
MODELLISTICA MATEMATICA E PIATTAFORME INFORMATICHE A SUPPORTO DELLA RICERCA AMBIENTALE
2021
La modellizzazione matematica è diventata ormai uno strumento essenziale nell’avanzamento delle conoscenze in qualsiasi campo della scienza, dall’econometria alla psicologia, dalla chimica all’epidemiologia, come vissuto di recente nella pandemia da SARS-coV-2. Anche quelle che erano una volta discipline “soft” come la biomedicina o l’ecologia possono ora usufruire di tecniche di rappresentazione ed esplicazione dei processi estremamente utili alla comprensione delle dinamiche in gioco. Questa evoluzione, dovuta in non piccola parte all’attuale disponibilità di abbondante potenza di calcolo elettronico a costi ridotti, non è però opera ed appannaggio soltanto della nostra generazione. Lo st…
Considerare i cittadini i primi alleati
2016
L’approvazione in molti Comuni italiani di «Regolamenti per l’amministrazione condivisa» sta dando luogo a molteplici «Patti» di collaborazione rispetto alla cura e rigenerazione dei beni comuni urbani. Si tratta di sperimentazioni in cui i diversi attori in gioco – Enti locali, abitanti, gruppi informali, soggetti privati e del privato sociale – provano a uscire da sterili polarizzazioni e a valorizzare le energie costruttive di tutti nel perseguire dei beni effettivamente comuni. Se è presto per fare il punto su processi ancora «giovani» (il primo Regolamento è del 2014), è tuttavia importante riflettere su come si stanno evolvendo le «regole del gioco» tra cittadini e amministrazioni loc…
Hop: Histogram of patterns for human action representation
2017
This paper presents a novel method for representing actions in terms of multinomial distributions of frequent sequential patterns of different length. Frequent sequential patterns are series of data descriptors that occur many times in the data. This paper proposes to learn a codebook of frequent sequential patterns by means of an apriori-like algorithm, and to represent an action with a Bag-of-Frequent-Sequential-Patterns approach. Preliminary experiments of the proposed method have been conducted for action classification on skeletal data. The method achieves state-of-the-art accuracy value in cross-subject validation.
Argenti e argentieri per il monastero del SS. Salvatore di Corleone
2015
Attraverso lo studio delle informazioni inedite annotate nei volumi depositati nel Fondo delle Corporazioni Religiose Soppresse dell'Archivio di Stato di Palermo, è possibile ricostruire la collezione di argenteria del monastero del Santo Salvatore di Corleone, oggi purtroppo in gran parte perduta, riportando alla luce anche le figure degli artisti che hanno realizzato le opere. Through the study of the unpublished information noted in the volumes deposited in the Fund of the Suppressed Religious Corporations of the State Archives of Palermo, it is possible to reconstruct the collection of silverware of the monastery of the Holy Savior of Corleone, now unfortunately largely lost, bringing t…
History of NAMRI and NAMRC
2019
History of NAMRI and NAMRC
Special Issue of Journal of Manufacturing Processes on New Trends in Manufacturing Processes Research
2019
Special issue of journal of manufacturing processes on new trends in manufacturing processes research