1,720,997 research outputs found
Enhancing interfacial bonding strength in fiber metal laminates through metal surface treatments
Full text linkIn recent decades, the aircraft industry has experienced a growing need for high-performance, lightweight structures, leading to a significant focus on developing fiber-metal laminates (FMLs). These composites possess various benefits in terms of stiffness, yield stress, fatigue, and high-velocity impact properties due to their hybrid composition. However, certain challenges related to the fabrication, surface treatment, and mechanical properties of these structures require further attention. This paper reviews FML manufacturing with a focus on enhancing the interfacial bonding strength between metal and fiber-reinforced polymer (FRP) sheets by conducting different kinds of surface treatment on metal layers to further enhance the FML mechanical properties
Numerical modelling of orthogonal cutting of Electron Beam Melted Ti6Al4V
No full textFinite element analysis of cutting processes of difficult-to-cut alloys is attracting more and more interest among the scientific community thanks to the change of predicting difficult to measure parameters as cutting forces, specific cutting pressures, cutting temperatures and the chip morphology. Aiming to calibrate and validate an FE numerical model, the predicted variables have to be compared with experimental results. Nowadays, Additive Manufactured Titanium alloys are being increasingly employed in the production of surgical implants and aero engine parts, but their peculiar fine acicular microstructure have to be taken into account dealing with their thermo- mechanical behavior as during machining operations. Based on the lack of literature works concerning experimental investigations on the machinability of Additive Manufactured Titanium alloys, this paper is aimed to investigate the cutting forces and temperatures arising during orthogonal cutting of an Electron Beam Melted (EBM) Ti6Al4V alloy
3D finite element modelling of surface modification in dry and cryogenic machining of EBM Ti6Al4V alloy
No full textExperimental analysis on semi-finishing machining of Ti6Al4V additively manufactured by direct melting laser sintering
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Numerical Simulation of Surface Modification During Machining of Nickel-based Superalloy
Full text linkAbstractThe main objective of this study is to implement a reliable FE model of the orthogonal machining of a Nickel based superalloy for the prediction of microstructural changes occurring during the process. A FE numerical model was properly calibrated using an iterative procedure based on the comparison between simulated and experimental results. A user subroutine was implemented in the FE code to simulate the dynamic recrystallization and consequently the grain refinement and hardness variation when orthogonal cutting of Nickel based superalloy is performed. Thus, Zener-Hollomon and Hall-Petch equations were implemented to predict the grain size and micro hardness, respectively. In addition, the depth of the affected layer was predicted using the critical strain equation. The obtained results proved the adequacy of the proposed model showing a good agreement between the simulated and the experimental results
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
A physically based constitutive model for predicting the surface integrity in machining of Waspaloy
No full textEnvironmentally clean micromilling of electron beam melted Ti6Al4V
Full text linkThe paper is aimed at evaluating the performances of Minimum Quantity Lubrication (MQL), dry cutting and cryogenic cooling when applied to the micro-milling of Ti6Al4V titanium alloy samples obtained by Additive Manufacturing (AM) using the Electron Beam Melting (EBM) technology. The micro-milling tests were carried out on a high precision 5-axis micro-milling center, at varying cutting speed and feed per tooth. The performances of the different lubrication/cooling strategies were analyzed in terms of surface integrity, namely surface topography, nano-hardness and sub-surface microstructural alterations, in order to prove the impact of clean cutting conditions when applied to micro-machining of a AM titanium alloy of biomedical interest. It is shown that dry cutting assures the same performances of MQL, representing then the most suitable option to decrease the environmental impact of the machining process. (C) 2016 Elsevier Ltd. All rights reserved
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