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Metals
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Selected Papers from the 8th International Conference on Mechanics and...
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Selected Papers from the 8th International Conference on Mechanics and Materials in Design (M2D 2019)

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 19416

Special Issue Editors

Prof. Dr. Maria Richetta

E-Mail Website
Guest Editor
Department of Industrial Engineering, University of Rome Tor Vergata, 00133 Roma, Italy
Interests: design; additive manufacturing; metals; mechanical properties; characterization
Special Issues, Collections and Topics in MDPI journals
Dr. Annalisa Acquesta

E-Mail Website
Guest Editor
Department of Chemical Engineering, Materials and Industrial Production, University of Napoli Federico II, Napoli, Italy
Interests: light metallic materials; surface treatments; corrosion resistance; additive manufacturing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

First, we want to thank you for participating in the M2D2019 Conference held in Bologna last September.

With the present letter ,we would like to invite you to submit an extended version of the paper you presented at the Conference (Ref. … …; Title … …) to Metals (/Metals/ (ISSN 2079-4991, CODEN:MBSEC7, https://www.mdpi.com/journal/metals, published by MDPI Basel, Switzerland).

As you probably know, this is a peer-reviewed open-access international journal, indexed by Scopus and WoS, and published by MDPI. Its Impact Factor is currently 2.259. It publishes reviews, regular research papers (articles), and short communications, with no restriction on the length of the papers. Moreover, the journal provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, properties, and functions of all kinds of metals.

Further details are available on the journal website: https://www.mdpi.com/journal/metals.

Your full paper must comply with the journal’s Instructions for Authors, which are available here: https://www.mdpi.com/journal/metals/instructions.

In order to submit your paper to the Special Issue related to the conference, you need to follow the standard procedure for manuscript submission. First, connect to https://www.mdpi.com/journal/metals. Then, log in (you may need to create a new account after a simple registration). Afterwards, enter the “Author” page and click on “Submit new Manuscript”. Upon manuscript “Type” selection, it is very important you tick on the "M2D 2019 Mechanics and Materials in Design" flag, which is the name of the aforementioned Special Issue. The submitted paper will then undergo the journal’s conventional peer-review procedure.

We look forward to receiving your contribution.

Do not hesitate to contact us, should you have any questions.

Prof. Dr. Maria Richetta
Dr. Annalisa Acquesta
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. Metals 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.

Keywords

  • Design
  • Topology optimization
  • Simulations
  • Additive manufacturing
  • Metals
  • Alloys
  • Nanostructures
  • Biomedical applications

Published Papers (5 papers)

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Research

16 pages, 5103 KiB  
Article
A Focus on Dynamic Modulus: Effects of External and Internal Morphological Features
by Maria Richetta and Alessandra Varone
Metals 2021, 11(1), 40; https://doi.org/10.3390/met11010040 - 26 Dec 2020
Cited by 4 | Viewed by 1849
Abstract
The present work examines the effects of external and internal morphological features on the dynamic elastic modulus and its measure. It consists of two parts. The first part considers the effect of geometrical features of probes and shows the key role of roughness [...] Read more.
The present work examines the effects of external and internal morphological features on the dynamic elastic modulus and its measure. It consists of two parts. The first part considers the effect of geometrical features of probes and shows the key role of roughness as source of a systematic error leading to the underestimation of the Young’s modulus. The second one is focused on the effect of porosity. Several models which consider the porosity as an ideal regular microstructure and the relative equations describing the Young’s modulus vs. porosity have been reviewed and critically discussed. The values of the relative modulus Er predicted by different models are similar for materials with low porosity (p < 0.2) and isolated pores whereas they strongly diverge if p > 0.2 and interconnected pores are present. Moreover, such models fail to describe the elastic behavior of materials correctly also with low porosity (p ≈ 0.1) such as sintered steels in the case of pores with a preferred orientation and an irregular shape. Full article
(This article belongs to the Special Issue Selected Papers from the 8th International Conference on Mechanics and Materials in Design (M2D 2019))
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22 pages, 5886 KiB  
Article
Numerical-Experimental Correlation of Dynamic Test of a Honeycomb Impact Attenuator for a Formula SAE Vehicle
by Andrea Vettorello, Giuseppe A. Campo, Giovanni Goldoni and Mauro Giacalone
Metals 2020, 10(5), 652; https://doi.org/10.3390/met10050652 - 18 May 2020
Cited by 9 | Viewed by 5737
Abstract
A honeycomb impact attenuator for a Formula SAE (FSAE) prototype vehicle is examined using both experimental and numerical analyses. Two common FSAE impact attenuators were compared to a new design concept, combining four layers of hexagonal honeycomb. The comparison aimed to obtain the [...] Read more.
A honeycomb impact attenuator for a Formula SAE (FSAE) prototype vehicle is examined using both experimental and numerical analyses. Two common FSAE impact attenuators were compared to a new design concept, combining four layers of hexagonal honeycomb. The comparison aimed to obtain the combination of the lowest mass and highest energy absorption. The attenuator must comply with both the FSAE championship rules and further internally-defined design constraints. The work continues addressing the numerical-experimental correlation of the applied materials. Finally, the finite element models for virtual crash testing are presented and were validated through the experimental tests. Full article
(This article belongs to the Special Issue Selected Papers from the 8th International Conference on Mechanics and Materials in Design (M2D 2019))
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13 pages, 3578 KiB  
Article
Investigation by Digital Image Correlation of Mixed Mode I and II Fracture Behavior of Metallic IASCB Specimens with Additive Manufactured Crack-Like Notch
by Ivo Campione, Tommaso Maria Brugo, Giangiacomo Minak, Jelena Janković Tomić, Nebojša Bogojević and Snežana Ćirić Kostić
Metals 2020, 10(3), 400; https://doi.org/10.3390/met10030400 - 20 Mar 2020
Cited by 9 | Viewed by 3234
Abstract
This work investigates the fracture behavior of maraging steel specimens manufactured by the selective laser sintering (SLS) technology, in which a crack-like notch (sharp notch) was directly produced during the additive manufacturing (AM) process. For the evaluation of the fracture toughness, the inclined [...] Read more.
This work investigates the fracture behavior of maraging steel specimens manufactured by the selective laser sintering (SLS) technology, in which a crack-like notch (sharp notch) was directly produced during the additive manufacturing (AM) process. For the evaluation of the fracture toughness, the inclined asymmetrical semi-circular specimen subjected to three points loading (IASCB) was used, allowing to cover a wide variety of Mode I and II combinations. The effectiveness of manufacturing crack-like notches via the SLS technique in metals was evaluated by comparing the obtained experimental results with the ones obtained with pre-cracks induced by fatigue loading. The investigation was carried out by using the digital image correlation (DIC) technique, that allowed the evaluation of the full displacement fields around the crack tip. The displacement field was then used to compute the stress intensity factors (SIFs) for various combinations of Mode I and II, via a fitting technique which relies on the Williams’ model for the displacement. The SIFs obtained in this way were compared to the results obtained with the conventional critical load method. The results showed that the discrepancy between the two methods reduces by ranging from Mode I to Mode II loading condition. Finally, the experimental SIFs obtained by the two methods were described by the mixed mode local stress criterium. Full article
(This article belongs to the Special Issue Selected Papers from the 8th International Conference on Mechanics and Materials in Design (M2D 2019))
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15 pages, 2924 KiB  
Article
Tribological Properties of Connecting Rod High Strength Screws Improved by Surface Peening Treatments
by Dario Croccolo, Massimiliano De Agostinis, Stefano Fini, Giorgio Olmi, Luca Paiardini and Francesco Robusto
Metals 2020, 10(3), 344; https://doi.org/10.3390/met10030344 - 05 Mar 2020
Cited by 6 | Viewed by 2789
Abstract
Bolted joints are highly loaded components and serious issues may arise from improper fastening and in particular from too high or too low preload. Friction at the underhead plays an important role, as it significantly affects the achievable preload for fixed and controlled [...] Read more.
Bolted joints are highly loaded components and serious issues may arise from improper fastening and in particular from too high or too low preload. Friction at the underhead plays an important role, as it significantly affects the achievable preload for fixed and controlled tightening torque. In addition, multiple tightening is usually performed on connecting rod screws, which may be a further source of friction increment. This study investigates the effect of two surface treatments, shot-peening and deep-rolling, on the tribological properties upon bolt fastening. This topic was tackled experimentally and the campaign involved MJ9 X 1 4 g grade 13.9 36 NiCrMo connecting rod screws, in both lubricated and dry conditions. The results, processed by statistical tools, indicate that deep-rolling does not affect friction, whereas shot-peening yields significant benefits. As an effect of the generation of dimples and multiple contacts, it is able to lower (up to 25%) the bearing frictional coefficient in lubricated conditions, also making the friction level independent of the number of re-tightenings. For a dry surface, an even higher friction decrease (up to 30%) is achieved. Without lubrication, the friction coefficient keeps increasing for the incremented number of tightenings, but the increase rate is lowered with respect to the untreated surface. Full article
(This article belongs to the Special Issue Selected Papers from the 8th International Conference on Mechanics and Materials in Design (M2D 2019))
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24 pages, 12374 KiB  
Article
Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality
by Vladimir V. Skripnyak, Evgeniya G. Skripnyak and Vladimir A. Skripnyak
Metals 2020, 10(3), 305; https://doi.org/10.3390/met10030305 - 26 Feb 2020
Cited by 20 | Viewed by 4973
Abstract
The present study investigates the effect of stress triaxiality on mechanical behavior and fracture of Ti-5Al-2.5Sn alloy in a practical relevant strain rate range from 0.1 to 1000 s−1. Tensile tests were carried out on flat smoothed and notched specimens using [...] Read more.
The present study investigates the effect of stress triaxiality on mechanical behavior and fracture of Ti-5Al-2.5Sn alloy in a practical relevant strain rate range from 0.1 to 1000 s−1. Tensile tests were carried out on flat smoothed and notched specimens using an Instron VHS 40/50-20 servo-hydraulic test machine. High-speed video registration was conducted by Phantom 711 Camera. Strain fields on the specimen gauge area were investigated by the digital image correlation method (DIC). The fracture surface relief was studied using digital microscope Keyence VHX-600D. Stress and strain fields during testing of the Ti-5Al-2.5Sn alloy were analyzed by the numerical simulation method. The evolution of strain fields at the investigated loading condition indicates that large plastic deformation occurs in localization bands. The alloy undergoes fracture governing by damage nucleation, growth, and coalescence in the localized plastic strain bands oriented along the maximum shear stresses. Results confirm that the fracture of near alpha titanium alloys has ductile behavior at strain rates from 0.1 to 1000 s−1, stress triaxiality parameter 0.33 < η < 0.6, and temperature close to 295 K. Full article
(This article belongs to the Special Issue Selected Papers from the 8th International Conference on Mechanics and Materials in Design (M2D 2019))
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