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Special Issue "Selected Papers from the International Aluminium Conference (INALCO) 2013"

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (15 April 2014)

Special Issue Editors

Guest Editor
Prof. Dr. Victor Songmene

Department of Mechanical Engineering École de technologie supérieure 1100, rue Notre-Dame Ouest Montréal (Qc), H3C 1K3, Canada
Website | E-Mail
Guest Editor
Prof. Dr. Peter J. Uggowitzer

ETH Zurich Metal Physics and Technology Department of Materials HCI J490, Wolfgang-Pauli Str. 10 CH-8093 Zurich, Switzerland
Website | E-Mail
Phone: +41 44 6322554
Interests: light metals, biodegradable metals, metallic glasses, corrosion-resistant alloys, phase transformations. Contribution: Special issue: “Light Alloys and Their Applications”

Special Issue Information

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Published Papers (5 papers)

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Research

Open AccessArticle Optimization of Aluminum Stressed Skin Panels in Offshore Applications
Materials 2014, 7(9), 6811-6831; doi:10.3390/ma7096811
Received: 28 February 2014 / Revised: 18 April 2014 / Accepted: 3 September 2014 / Published: 19 September 2014
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Abstract
Since the introduction of general European rules for the design of aluminium structures, specific rules for the design of aluminum stressed skin panels are available. These design rules have been used for the optimization of two extrusion products: one for explosions and wind
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Since the introduction of general European rules for the design of aluminium structures, specific rules for the design of aluminum stressed skin panels are available. These design rules have been used for the optimization of two extrusion products: one for explosions and wind load governing and one for explosions and floor load governing. The optimized extrusions fulfill Class 3 section properties, leading to weight reductions up to 25% of regularly-used shear panel sections. When the design is based on Class 4 section properties, even more weight reduction may be reached. The typical failure mode of the optimized stressed skin panels depends on the applied height of the hat stiffeners. For sections using relatively high hat stiffeners, failure is introduced by yielding of the heat-affected zone. For this type of cross-section, Eurocode 9 design rules and numerical calculations show very good agreement. For sections using relatively low hat stiffeners, failure is introduced by global buckling. For this type of cross-section, Eurocode 9 gives rather conservative results. Full article
Open AccessArticle Influence of Column Axial Load and Heat Affected Zone on the Strength of Aluminium Column Web in Tension
Materials 2014, 7(5), 3557-3567; doi:10.3390/ma7053557
Received: 27 February 2014 / Revised: 12 April 2014 / Accepted: 18 April 2014 / Published: 6 May 2014
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Abstract
The component method for aluminium joints has been recently introduced in some codes and guidelines. Nevertheless, it is still in need of some development and improvement, as in some cases it was obtained by adapting the existing formulations that are valid for steel.
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The component method for aluminium joints has been recently introduced in some codes and guidelines. Nevertheless, it is still in need of some development and improvement, as in some cases it was obtained by adapting the existing formulations that are valid for steel. The current paper presents the main outcomes of a parametric analysis carried out by means of finite element (FE) numerical models for determining the influence of both column axial load and heat affected zone—in the case of welded details—on the structural response of the column web in a tension component. The proposed study integrates previous research carried out by the authors, where the influence of the assumed alloy was investigated and interpreted by corrective parameters expressed as a function of both the material strain hardening and ductility. Full article
Open AccessArticle Optimization of Friction Stir Welding Tool Advance Speed via Monte-Carlo Simulation of the Friction Stir Welding Process
Materials 2014, 7(5), 3435-3452; doi:10.3390/ma7053435
Received: 24 February 2014 / Revised: 24 March 2014 / Accepted: 23 April 2014 / Published: 30 April 2014
Cited by 4 | PDF Full-text (930 KB) | HTML Full-text | XML Full-text
Abstract
Recognition of the friction stir welding process is growing in the aeronautical and aero-space industries. To make the process more available to the structural fabrication industry (buildings and bridges), being able to model the process to determine the highest speed of advance possible
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Recognition of the friction stir welding process is growing in the aeronautical and aero-space industries. To make the process more available to the structural fabrication industry (buildings and bridges), being able to model the process to determine the highest speed of advance possible that will not cause unwanted welding defects is desirable. A numerical solution to the transient two-dimensional heat diffusion equation for the friction stir welding process is presented. A non-linear heat generation term based on an arbitrary piecewise linear model of friction as a function of temperature is used. The solution is used to solve for the temperature distribution in the Al 6061-T6 work pieces. The finite difference solution of the non-linear problem is used to perform a Monte-Carlo simulation (MCS). A polynomial response surface (maximum welding temperature as a function of advancing and rotational speed) is constructed from the MCS results. The response surface is used to determine the optimum tool speed of advance and rotational speed. The exterior penalty method is used to find the highest speed of advance and the associated rotational speed of the tool for the FSW process considered. We show that good agreement with experimental optimization work is possible with this simplified model. Using our approach an optimal weld pitch of 0.52 mm/rev is obtained for 3.18 mm thick AA6061-T6 plate. Our method provides an estimate of the optimal welding parameters in less than 30 min of calculation time. Full article
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Open AccessArticle Modeling the Formation of Transverse Weld during Billet-on-Billet Extrusion
Materials 2014, 7(5), 3470-3480; doi:10.3390/ma7053470
Received: 28 February 2014 / Revised: 22 April 2014 / Accepted: 24 April 2014 / Published: 30 April 2014
Cited by 1 | PDF Full-text (1784 KB) | HTML Full-text | XML Full-text
Abstract
A comprehensive mathematical model of the hot extrusion process for aluminum alloys has been developed and validated. The plasticity module was developed using a commercial finite element package, DEFORM-2D, a transient Lagrangian model which couples the thermal and deformation phenomena. Validation of the
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A comprehensive mathematical model of the hot extrusion process for aluminum alloys has been developed and validated. The plasticity module was developed using a commercial finite element package, DEFORM-2D, a transient Lagrangian model which couples the thermal and deformation phenomena. Validation of the model against industrial data indicated that it gave excellent predictions of the pressure during extrusion. The finite element predictions of the velocity fields were post-processed to calculate the thickness of the surface cladding as one billet is fed in after another through the die (i.e., the transverse weld). The mathematical model was then used to assess the effect a change in feeder dimensions would have on the shape, thickness and extent of the transverse weld during extrusion. Experimental measurements for different combinations of billet materials show that the model is able to accurately predict the transverse weld shape as well as the clad surface layer to thicknesses of 50 µm. The transverse weld is significantly affected by the feeder geometry shape, but the effects of ram speed, billet material and temperature on the transverse weld dimensions are negligible. Full article
Open AccessArticle Numerical Study of Variation of Mechanical Properties of a Binary Aluminum Alloy with Respect to Its Grain Shapes
Materials 2014, 7(4), 3065-3083; doi:10.3390/ma7043065
Received: 28 February 2014 / Revised: 2 April 2014 / Accepted: 4 April 2014 / Published: 15 April 2014
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Abstract
To study the variation of the mechanical behavior of binary aluminum copper alloys with respect to their microstructure, a numerical simulation of their granular structure was carried out. The microstructures are created by a repeated inclusion of some predefined basic grain shapes into
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To study the variation of the mechanical behavior of binary aluminum copper alloys with respect to their microstructure, a numerical simulation of their granular structure was carried out. The microstructures are created by a repeated inclusion of some predefined basic grain shapes into a representative volume element until reaching a given volume percentage of the α-phase. Depending on the grain orientations, the coalescence of the grains can be performed. Different granular microstructures are created by using different basic grain shapes. Selecting a suitable set of basic grain shapes, the modeled microstructure exhibits a realistic aluminum alloy microstructure which can be adapted to a particular cooling condition. Our granular models are automatically converted to a finite element model. The effect of grain shapes and sizes on the variation of elastic modulus and plasticity of such a heterogeneous domain was investigated. Our results show that for a given α-phase fraction having different grain shapes and sizes, the elastic moduli and yield stresses are almost the same but the ultimate stress and elongation are more affected. Besides, we realized that the distribution of the θ phases inside the α phases is more important than the grain shape itself. Full article
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