1,720,992 research outputs found
Elucidating role of sheets mutual position and copper interlayer in FSW of dissimilar Ti6Al4V-SS316L lap joints: Metallurgical and mechanical characterizations
No full textTechnological advancements catering to the specific requirements of different industries have led to a rise in the use of multi-material components. Combining titanium and stainless steel can reduce the weight of components used for many industrial applications, making it a popular choice. The present investigation compares Ti6Al4V/SS 316 L friction stir welded (FSW) lap joints' metallurgical and mechanical properties as a function of velocity ratio, sheets' mutual position, and the presence of a Cu interlayer. The process mechanics and the impact of different strategies on intermetallic (IMC), grain morphology, intermittent phases, joint resistance, and microhardness are discussed. Successful FSW lap joints of SS 316 L/ Ti6Al4V, utilizing SS 316 L as the upper plate and a Cu interlayer, have been documented and deliberated for the first time in the present study. These specimens demonstrated immaculate joints for all the processing velocity ratios owing to superior mechanical interlocking offered by distinguished extruded hook accompanied by comparatively lean IMC layers affecting tensile shear strengths
Process and production planning in manufacturing enterprise networks
No full textUniversity of Durham, England
Improving the Industrial Efficiency of Recycling Aluminum Alloy Chips Using Friction Stir Extrusion: Thin Wires Production Process
Full text linkFriction stir extrusion is one of the most promising solid-state chip recycling techniques because of its relative simplicity and high efficiency. One of the most straightforward applications for the process is the production of recycled wires to be utilized as filler material in welding or welding-based additive manufacturing processes, in order to create an industrial symbiosis link, fostering a circular economy and enhancing the technology readiness level of the process. The scalability of the process to the thin wires needed for such applications has not been investigated so far. In this paper, an experimental and numerical analysis was developed. A dedicated numerical model was first validated and then used to design the tool geometry. The effect of tool rotation and tool force on both “standard” mechanical properties, as Ultimate Tensile Strength and microhardness, and specific properties for the envisaged application, as the wrapping around reels with different radii, was investigated. The numerical model results were used to explain the influence of the process parameters on the material flow as well as on the distribution of the primary field variables, namely temperature, strain, and strain rate. Finally, the energy demand was measured, and the specific energy consumption (SEC) was evaluated. It was found that a conical shoulder surface favors the conditions for effective solid bonding. Low values of the extrusion force have detrimental effects on the wires properties as they result either in insufficient strain, or hot cracking defects. High values of extrusion force results in lower SEC, unlocking the potential of the process as symbiotic link enabler
Joining by forming technologies: current solutions and future trends
Full text linkThe progressively more demanding needs of emissions and costs reduction in the transportation industry are pushing engineers towards the use of increasingly lightweight structures. This goal can be achieved only if dissimilar and/or new materials, including polymers and composites, are joined together to create complex structures. Conventional fusion welding processes have often been proven inadequate to this task because of the high heat input reducing the joint mechanical properties or even making the joining process impossible. Joining by forming technologies take advantage on the plastic deformation to create sound joints out of even very dissimilar materials. Over the last 25 years, several new processes, with increasing potential in effectively joining virtually every structural material, have been invented and developed. In the paper, a comprehensive overview of the most utilized joining by forming processes is given. For each process, an analysis of the current research trends and hot topics is provided, highlighting strengths and weaknesses for industrial applications
Educare all'imprenditorialità: Esperienze di incubazione d'impresa nell'Università di Palermo
No full textIl contributo prende spunto dalle iniziative recentemente avviate nell'Università degli studi di Palermo in tema di valorizzazione della ricerca scientifica. In particolare il tema qui affrontato riferisce delle esperienze di avvio di start up innovative ad opera di laureati e ricercatori che si sono avvalsi del supporto dell'incubatore d'impresa gestito dal Consorzio ARCA. A partire dai risultati ottenuti in questi anni vengono esposte le finalità di iniziative di educazione all'imprenditorialità promosse dall'Ateneo di Palerm
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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