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Selected Papers from the International Aluminium Conference (INALCO) 2013
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Selected Papers from the International Aluminium Conference (INALCO) 2013

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

Deadline for manuscript submissions: closed (15 April 2014) | Viewed by 37727

Special Issue Editors

Prof. Dr. Victor Songmene

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Département de Génie Mécanique, École de Technologie Supérieure, Montréal, QC, Canada
Interests: machinability and machining; metals and advanced materials; cutting tool performance; sustainable machining; machining conditions optimization
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Peter J. Uggowitzer

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ETH Zurich Metal Physics and Technology Department of Materials HCI J494, Vladimir-Prelog-Weg 1-5/10, CH-8093 Zurich, Switzerland
Interests: light metals; biodegradable metals; corrosion-resistant alloys; phase transformations
Special Issues, Collections and Topics in MDPI journals

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Published Papers (5 papers)

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Research

2549 KiB  
Article
Optimization of Aluminum Stressed Skin Panels in Offshore Applications
by Dianne Van Hove and Frans Soetens
Materials 2014, 7(9), 6811-6831; https://doi.org/10.3390/ma7096811 - 19 Sep 2014
Cited by 2 | Viewed by 7744
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 [...] Read more.
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
(This article belongs to the Special Issue Selected Papers from the International Aluminium Conference (INALCO) 2013)
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386 KiB  
Article
Influence of Column Axial Load and Heat Affected Zone on the Strength of Aluminium Column Web in Tension
by Gianfranco De Matteis, Gianluca Sarracco, Giuseppe Brando and Federico M. Mazzolani
Materials 2014, 7(5), 3557-3567; https://doi.org/10.3390/ma7053557 - 6 May 2014
Cited by 7 | Viewed by 7080
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. [...] Read more.
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
(This article belongs to the Special Issue Selected Papers from the International Aluminium Conference (INALCO) 2013)
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1784 KiB  
Article
Modeling the Formation of Transverse Weld during Billet-on-Billet Extrusion
by Yahya Mahmoodkhani, Mary Wells, Nick Parson, Chris Jowett and Warren Poole
Materials 2014, 7(5), 3470-3480; https://doi.org/10.3390/ma7053470 - 30 Apr 2014
Cited by 11 | Viewed by 7826
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 [...] Read more.
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
(This article belongs to the Special Issue Selected Papers from the International Aluminium Conference (INALCO) 2013)
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930 KiB  
Article
Optimization of Friction Stir Welding Tool Advance Speed via Monte-Carlo Simulation of the Friction Stir Welding Process
by Kirk A. Fraser, Lyne St-Georges and Laszlo I. Kiss
Materials 2014, 7(5), 3435-3452; https://doi.org/10.3390/ma7053435 - 30 Apr 2014
Cited by 21 | Viewed by 7453
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 [...] Read more.
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
(This article belongs to the Special Issue Selected Papers from the International Aluminium Conference (INALCO) 2013)
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2366 KiB  
Article
Numerical Study of Variation of Mechanical Properties of a Binary Aluminum Alloy with Respect to Its Grain Shapes
by Hamid Sharifi and Daniel Larouche
Materials 2014, 7(4), 3065-3083; https://doi.org/10.3390/ma7043065 - 15 Apr 2014
Cited by 3 | Viewed by 6815
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 [...] Read more.
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
(This article belongs to the Special Issue Selected Papers from the International Aluminium Conference (INALCO) 2013)
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