Special Issue "Composites, Alloys and Advanced Processes for Manufacturing in Aeronautics and Aerospace"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: 30 June 2020.

Special Issue Editors

Prof. Dr. Norberto López de Lacalle Marcaide
Website
Guest Editor
Department of Mechanical Engineering, University of the Basque Country UPV/EHU & CFAA, The Aeronautics Advanced Manufacturing Center, Bilbao, Spain
Interests: Machining of superalloys; additive manufacturing; welding; coatings; machining; manufacturing of aeroengine components; vibrations in manufacturing processes
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Prof. Dr. Naiara Ortega
Website
Guest Editor
Metrology lab CFAA; Department of Mechanical Engineering, University of the Basque Country; EIB, Alameda de Urquijo s/n, 48013 Bilbao, Spain
Interests: metrology; NDTs; welding; coatings; machining; manufacturing of aeroengine components; vibrations in manufacturing processes
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Dr. Joseba Albizuri
Website
Guest Editor
Department of Mechanical Engineering, University of the Basque Country; EIB, Alameda de Urquijo s/n, 48013 Bilbao, Spain
Interests: machining of superalloys; additive manufacturing; welding; coatings; machining; manufacturing of aeroengine components; vibrations in manufacturing processes
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Aeronautics is moving fast for achieving the general goals of a reduction in fuel consumption, a reduction of CO2 and NOx emissions by 30%, and a dramatic reduction in noise. The so-called NEO airplanes are now flying overs us; NEO stands for new engine option. There are also new aircrafts launched in Japan and China, as well as variations in the main airliner’s manufacturers.

Materials, both for fuselage and engines, are key, but all machine-tools, cutting tools, additive manufacturing, and production equipment are of paramount importance as well. To improve production by two, in order to be able to accomplish the huge demand of new planes, new materials, new processes, and new approaches are key.

Additive manufacturing is also a new player in the field, involving new alloys in powder, machines, and applications. However, machining, drilling, and grinding are, and still will be, the practical solution for achieving both productivity and tight tolerances.

On the other hand, the early detection of materials defects, nondestructive inspection, and metrology are the basic elements to keep safety as close to being absolute reliability. Mechanical testing, fatigue experimentation, and other fields are key as well.

Papers about composites, special alloys, primary and secondary processes, and other manufacturing concepts related with aeronautics and aerospace will be considered.

Prof. Dr. Luis Norberto López de Lacalle
Prof. Dr. Naiara Ortega
Dr. Joseba Albizuri
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Machining of superalloys
  • Drilling, riveting, and assembly of composites and aerostructures
  • Composites CFRP
  • Laser-additive manufacturing
  • Abrasive machining and finishing
  • New emerging alloys: Gamma Ti–Al processing
  • Machinability
  • Surface integrity
  • Modeling of machining and grinding processes
  • Integral blade rotors: the challenge
  • Cutting tools for the group ISO S-alloys
  • Special processes for emerging materials
  • Testing of materials: fatigue and electrochemical performance
  • Health monitoring

Published Papers (4 papers)

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Research

Open AccessArticle
Large Cutting Depth and Layered Milling of Titanium Alloy Thin-Walled Parts
Materials 2020, 13(7), 1499; https://doi.org/10.3390/ma13071499 - 25 Mar 2020
Abstract
Deformation of thin-walled titanium alloys can occur during the milling process due to the cutting force and chatter vibration, which can influence the precision of the finished parts. In this research, a new milling method without auxiliary support for machining of thin-walled parts [...] Read more.
Deformation of thin-walled titanium alloys can occur during the milling process due to the cutting force and chatter vibration, which can influence the precision of the finished parts. In this research, a new milling method without auxiliary support for machining of thin-walled parts was proposed. A large cutting depth and layered milling technology were used during rough machining, with a different machining allowance for each subsequent remaining layer. In the finishing stage, the surface of the previous layer needed to be dressed before processing the next layer. A TiAlSiN-coated, cemented carbide milling cutter was used to machine titanium alloy thin-walled parts, which are characterized by continuous multilayers of unequal thickness. The processing path was simulated using HyperMILL software, and the machining accuracy was detected by the 3D optical scanner. The measurement results indicated that the surface contour accuracy of the parts was ±0.21 mm, within a range of ±0.30 mm. The machining efficiency was increased by 40%, while guaranteeing machining accuracy. Full article
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Open AccessArticle
Machining Stresses and Initial Geometry on Bulk Residual Stresses Characterization by On-Machine Layer Removal
Materials 2020, 13(6), 1445; https://doi.org/10.3390/ma13061445 - 22 Mar 2020
Abstract
Prediction and control of machining distortion is a primary concern when manufacturing monolithic components due to the high scrap and rework costs involved. Bulk residual stresses, which vary from blank to blank, are a major factor of machining distortion. Thus, a bulk stress [...] Read more.
Prediction and control of machining distortion is a primary concern when manufacturing monolithic components due to the high scrap and rework costs involved. Bulk residual stresses, which vary from blank to blank, are a major factor of machining distortion. Thus, a bulk stress characterization is essential to reduce manufacturing costs linked to machining distortion. This paper proposes a method for bulk stress characterization on aluminium machining blanks, suitable for industrial application given its low requirements on equipment, labour expertise, and computation time. The method couples the effects of bulk residual stresses, machining stresses resulting from cutting loads on the surface and raw geometry of the blanks, and presents no size limitations. Experimental results confirm the capability of the proposed method to measure bulk residual stresses effectively and its practicality for industrial implementation. Full article
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Open AccessArticle
Pseudo-random Path Generation Algorithms and Strategies for the Surface Quality Improvement of Optical Aspherical Components
Materials 2020, 13(5), 1216; https://doi.org/10.3390/ma13051216 - 08 Mar 2020
Abstract
This study proposes two path generation algorithms to diminish the superposition of the convolution effect on the polishing path in computer-controlled optical surfacing. According to the polishing of aluminum-alloy based hyperboloid optical components, different proportions of polishing agents were blended. Then, the surface [...] Read more.
This study proposes two path generation algorithms to diminish the superposition of the convolution effect on the polishing path in computer-controlled optical surfacing. According to the polishing of aluminum-alloy based hyperboloid optical components, different proportions of polishing agents were blended. Then, the surface roughness of the optical components were determined through a validation experiment of the algorithms. Furthermore, the relationship between surface roughness and the polishing agent concentration, and the compensation strategies for surface roughness were analyzed. The results show that the two algorithms effectively compensated for surface waviness. The findings support the strategies for improving the surface quality of optical components with aspherical surfaces. Full article
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Open AccessArticle
Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys
Materials 2020, 13(3), 530; https://doi.org/10.3390/ma13030530 - 22 Jan 2020
Abstract
Shape-memory alloys such as nitinol are gaining popularity as advanced materials in the aerospace, medical, and automobile sectors. However, nitinol is a difficult-to-cut material because of its versatile specific properties such as the shape-memory effect, superelasticity, high specific strength, high wear and corrosion [...] Read more.
Shape-memory alloys such as nitinol are gaining popularity as advanced materials in the aerospace, medical, and automobile sectors. However, nitinol is a difficult-to-cut material because of its versatile specific properties such as the shape-memory effect, superelasticity, high specific strength, high wear and corrosion resistance, and severe strain hardening. Anunconventional machining process like wire-electrical-discharge-machining (WEDM) can be effectively and efficiently used for the machining of such alloys, although the WEDM-induced surface integrity of nitinol hassignificant impact on material performance. Therefore, this work investigated the surface integrity of WEDM-processed nitinol samples using digital microscopy imaging, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) analysis. Three-dimensional analysis of the surfaces was carried out in two different patterns (along the periphery and the vertical plane of the machined surface) andrevealed that surface roughness was maximalat the point where the surface was largely exposed to the WEDM dielectric fluid. To attain the desired surface roughness, appropriate discharge energy is required that, in turn, requires the appropriate parameter settings of the WEDM process. Different SEM image analyses showed a reduction in microcracks and pores, and in globule-density size at optimized parameters. EDX analysis revealed the absence of wire material on the machined surface Full article
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