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Micromachines
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Advanced Manufacturing Technology
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Advanced Manufacturing Technology

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 11360

Special Issue Editors

Prof. Dr. John D. Kechagias

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Guest Editor
General Department, Laboratory for Machine Tools and Manufacturing Processes, University of Thessaly, 41500 Gaiopolis, Greece
Interests: CNC machine tools; manufacturing technology; quality engineering
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Panagiotis Kyratsis

E-Mail Website
Guest Editor
Department of Product and Systems Design Engineering, University of Western Macedonia, 50100 Kila Kozani, Greece
Interests: computational design; CAD/CAM/CAE; digital manufacturing; product design; FEA; industry 4.0; prototyping; reverse engineering
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Dimitrios Manolakos

E-Mail Website
Guest Editor
School of Mechanical Engineering, National Technical University of Athens, 157-73 Athens, Greece
Interests: manufacturing processes (rolling, forging, extrusion, sheet metal forming, metal removal processing, welding, casting, explosive cladding); precision and ultra-precision manufacturing; nanotechnology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

A great deal of the research work performed in design and manufacturing deals with the use and advancement of new technologies. Novel methodologies and intelligent tools help design and manufacturing engineers to reduce the time to market and increase the quality of the products and services offered.

Both design and manufacturing can be seen from a variety of views, and it is expected that this multidisciplinary Special Issue will bring together researchers from a variety of areas. This will result in a collection of different perspectives regarding the latest progress in technologies and advancements that lie at the core of an engineer’s work. This blending of expertise and outcomes will, in turn, encourage further cooperation.

This Special Issue provides an opportunity for researchers to present recent advances and technologies in the aforementioned fields as well as outline the future trends for design and manufacturing technologies.

Suitable topics for this Special Issue include, but are not limited to:

  • Additive manufacturing and applications
  • CAD/CAM/CAE systems and technologies
  • Reverse engineering and prototyping
  • Linear and non-linear finite element simulations
  • Robotics in manufacturing
  • CMM applications and cloud manufacturing
  • Precision machining, micromachining, and machinability
  • Design and manufacturing optimization applications
  • Advances in design and manufacturing simulations
  • Computational design and Industry 4.0
  • Soft computing in design and manufacturing applications
  • Conventional and non-conventional manufacturing processes
Prof. Dr. John D. Kechagias
Prof. Dr. Panagiotis Kyratsis
Prof. Dr. Dimitrios Manolakos
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 submissions that pass pre-check are 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. Micromachines is an international peer-reviewed open access monthly 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 2600 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.

Published Papers (3 papers)

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Research

16 pages, 3138 KiB  
Article
Influence of the Nose Radius on the Machining Forces Induced during AISI-4140 Hard Turning: A CAD-Based and 3D FEM Approach
by Anastasios Tzotzis, César García-Hernández, José-Luis Huertas-Talón and Panagiotis Kyratsis
Micromachines 2020, 11(9), 798; https://doi.org/10.3390/mi11090798 - 23 Aug 2020
Cited by 22 | Viewed by 2495
Abstract
The present study investigated the performance of three ceramic inserts in terms of the micro-geometry (nose radius and cutting edge type) with the aid of a 3D finite element (FE) model. A set of nine simulation runs was performed according to three levels [...] Read more.
The present study investigated the performance of three ceramic inserts in terms of the micro-geometry (nose radius and cutting edge type) with the aid of a 3D finite element (FE) model. A set of nine simulation runs was performed according to three levels of cutting speed and feed rate with respect to a predefined depth of cut and tool nose radius. The yielded results were compared to the experimental values that were acquired at identical cutting conditions as the simulated ones for verification purposes. Consequently, two more sets of nine simulations each were carried out so that a total of 27 turning simulation runs would adduce. The two extra sets corresponded to the same cutting conditions, but to different cutting tools (with varied nose radius). Moreover, a prediction model was established based on statistical methodologies such as the response surface methodology (RSM) and the analysis of variance (ANOVA), further investigating the relationship between the critical parameters (cutting speed, feed rate, and nose radius) and their influence on the generated turning force components. The comparison between the experimental values of the cutting force components and the simulated ones demonstrated an increased correlation that exceeded 89%. Similarly, the values derived from the statistical model were in compliance with the equivalent FE model values due to the verified adequacy. Full article
(This article belongs to the Special Issue Advanced Manufacturing Technology)
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15 pages, 7901 KiB  
Article
The Mechanical and Physical Properties of 3D-Printed Materials Composed of ABS-ZnO Nanocomposites and ABS-ZnO Microcomposites
by Nectarios Vidakis, Markos Petousis, Athena Maniadi, Emmanuel Koudoumas, George Kenanakis, Cosmin Romanitan, Oana Tutunaru, Mirela Suchea and John Kechagias
Micromachines 2020, 11(6), 615; https://doi.org/10.3390/mi11060615 - 25 Jun 2020
Cited by 46 | Viewed by 3602
Abstract
In order to expand the mechanical and physical capabilities of 3D-printed structures fabricated via commercially available 3D printers, nanocomposite and microcomposite filaments were produced via melt extrusion, 3D-printed and evaluated. The scope of this work is to fabricate physically and mechanically improved nanocomposites [...] Read more.
In order to expand the mechanical and physical capabilities of 3D-printed structures fabricated via commercially available 3D printers, nanocomposite and microcomposite filaments were produced via melt extrusion, 3D-printed and evaluated. The scope of this work is to fabricate physically and mechanically improved nanocomposites or microcomposites for direct commercial or industrial implementation while enriching the existing literature with the methodology applied. Zinc Oxide nanoparticles (ZnO nano) and Zinc Oxide micro-sized particles (ZnO micro) were dispersed, in various concentrations, in Acrylonitrile Butadiene Styrene (ABS) matrices and printable filament of ~1.75mm was extruded. The composite filaments were employed in a commercial 3D printer for tensile and flexion specimens’ production, according to international standards. Results showed a 14% increase in the tensile strength at 5% wt. concentration in both nanocomposite and microcomposite materials, when compared to pure ABS specimens. Furthermore, a 15.3% increase in the flexural strength was found in 0.5% wt. for ABS/ZnO nano, while an increase of 17% was found on 5% wt. ABS/ZnO micro. Comparing the two composites, it was found that the ABS/ZnO microcomposite structures had higher overall mechanical strength over ABS/ZnO nanostructures. Full article
(This article belongs to the Special Issue Advanced Manufacturing Technology)
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20 pages, 5587 KiB  
Article
Investigation of Hydrogen Embrittlement Susceptibility and Fracture Toughness Drop after in situ Hydrogen Cathodic Charging for an X65 Pipeline Steel
by Helen P. Kyriakopoulou, Panagiotis Karmiris-Obratański, Athanasios S. Tazedakis, Nikoalos M. Daniolos, Efthymios C. Dourdounis, Dimitrios E. Manolakos and Dimitrios Pantelis
Micromachines 2020, 11(4), 430; https://doi.org/10.3390/mi11040430 - 20 Apr 2020
Cited by 19 | Viewed by 4286
Abstract
The present research focuses on the investigation of an in situ hydrogen charging effect during Crack Tip Opening Displacement testing (CTOD) on the fracture toughness properties of X65 pipeline steel. This grade of steel belongs to the broader category of High Strength Low [...] Read more.
The present research focuses on the investigation of an in situ hydrogen charging effect during Crack Tip Opening Displacement testing (CTOD) on the fracture toughness properties of X65 pipeline steel. This grade of steel belongs to the broader category of High Strength Low Alloy Steels (HSLA), and its microstructure consists of equiaxed ferritic and bainitic grains with a low volume fraction of degenerated pearlite islands. The studied X65 steel specimens were extracted from pipes with 19.15 mm wall thickness. The fracture toughness parameters were determined after imposing the fatigue pre-cracked specimens on air, on a specific electrolytic cell under a slow strain rate bending loading (according to ASTM G147-98, BS7448, and ISO12135 standards). Concerning the results of this study, in the first phase the hydrogen cations’ penetration depth, the diffusion coefficient of molecular and atomic hydrogen, and the surficial density of blisters were determined. Next, the characteristic parameters related to fracture toughness (such as J, KQ, CTODel, CTODpl) were calculated by the aid of the Force-Crack Mouth Open Displacement curves and the relevant analytical equations. Full article
(This article belongs to the Special Issue Advanced Manufacturing Technology)
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