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Metals
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Additive Manufacturing of Cellular Structures Based on Metal Materials
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Additive Manufacturing of Cellular Structures Based on Metal Materials

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 10339

Special Issue Editor

Dr. Paweł Baranowski

E-Mail Website1 Website2
Guest Editor
Military University of Technology, Faculty of Mechanical Engineering, Institute of Mechanics and Computational Engineering, 00-908 Warsaw, Poland
Interests: numerical modelling and simulation; dynamic behavior of materials; material constitutive modelling; experimental testing

Special Issue Information

Dear Colleagues,

During the last decade, regular cellular structures have attracted the attention of many scientists because of their specific mechanical properties, including a low mass and high strength. Additionally, the dynamic progress of additive manufacturing technologies provides a possibility to produce complex topologies, which would constitute a challenge to the standard methods. Therefore, the main aim of this Special Issue is to publish scientific papers covering the recent problems related to the additive manufacturing of 2D and 3D regular cellular structures using metal materials, including the following:

  • mechanical behavior in terms of energy-absorption and crashworthiness capabilities;
  • experimental testing under quasi-static and dynamic conditions;
  • numerical modelling and simulation coupled with experimental tests;
  • microscopic studies of additively manufactured materials;
  • fracture and damage under low and high strain rates;
  • and others...

Hopefully, the presented Special Issue will receive many excellent papers covering the key aspects of experimental tests, material studies, and the numerical modelling and simulations of regular cellular structures. Ultimately, it will create a useful source of data and knowledge for scientists working in a similar field.

Dr. Paweł Baranowski
Guest Editor

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

  • additive manufacturing
  • regular cellular structure
  • energy absorption
  • numerical simulation
  • experimental testing
  • behavior of material
  • fracture
  • damage

Published Papers (2 papers)

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Research

23 pages, 10419 KiB  
Article
Ballistic Impact Resistance of Bulletproof Vest Inserts Containing Printed Titanium Structures
by Pawel Zochowski, Marcin Bajkowski, Roman Grygoruk, Mariusz Magier, Wojciech Burian, Dariusz Pyka, Miroslaw Bocian and Krzysztof Jamroziak
Metals 2021, 11(2), 225; https://doi.org/10.3390/met11020225 - 28 Jan 2021
Cited by 23 | Viewed by 7219
Abstract
Finite element modeling of ballistic impact of inserts containing titanium structures were presented in the article. The inserts containing an additional layer made using additive manufacturing technology were analyzed. The layer was created from repetitive elements made without connections (adjacent cells were inseparable). [...] Read more.
Finite element modeling of ballistic impact of inserts containing titanium structures were presented in the article. The inserts containing an additional layer made using additive manufacturing technology were analyzed. The layer was created from repetitive elements made without connections (adjacent cells were inseparable). Four variants of printed titanium structures were placed between layers of Twaron CT 750 aramid fabric to create ballistic inserts. In order to assess the ballistic resistance of the inserts, numerical simulations of ballistic impact phenomenon were carried out using LS-Dyna software. In the simulations the inserts were placed on a steel box filled with ballistic clay and were fired at with the 9 × 19 mm full metal jacket (FMJ) Parabellum projectile. The main aim of the work was to check the effectiveness of such solutions in soft ballistic protection applications and to select the most effective variant of 3D printed structure. Results of the numerical analysis showed a high potential for 3D printed structures made of titanium alloys to be used for bulletproof vest inserts. In all analyzed cases the projectile was stopped by the armor. In addition, thanks to the cooperation of adjacent cells, the projectile energy density was distributed over a large area, as evidenced by large volumes of hollows in the ballistic clay. The indentations in the ballistic clay obtained in the simulations were significantly lower than the acceptable value for the back face deformation (BFD) parameter required by international body armor standards. Full article
(This article belongs to the Special Issue Additive Manufacturing of Cellular Structures Based on Metal Materials)
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18 pages, 5697 KiB  
Article
Influence of the Miniaturisation Effect on the Effective Stiffness of Lattice Structures in Additive Manufacturing
by Guillaume Meyer, Florian Brenne, Thomas Niendorf and Christian Mittelstedt
Metals 2020, 10(11), 1442; https://doi.org/10.3390/met10111442 - 29 Oct 2020
Cited by 7 | Viewed by 2715
Abstract
Thin-walled and cellular structures are characterised by superior lightweight potential due to their advantageous stiffness to weight ratio. They find particular interest in the field of additive manufacturing due to robust and reproducible manufacturability. However, the mechanical performance of such structures strongly depends [...] Read more.
Thin-walled and cellular structures are characterised by superior lightweight potential due to their advantageous stiffness to weight ratio. They find particular interest in the field of additive manufacturing due to robust and reproducible manufacturability. However, the mechanical performance of such structures strongly depends on the manufacturing process and resultant geometrical imperfections such as porosity, deviations in strut thickness or surface roughness, for which an understanding of their influence is crucially needed. So far, many authors conducted empirical investigations, while analytical methods are rarely applied. In order to obtain efficient design rules considering both mechanical properties and process induced characteristics, analytical descriptions are desirable though. Available analytical models for the determination of effective properties are mostly based on the simple advancement of beam theories, mostly ignoring manufacturing characteristics that, however, strongly influence the mechanical properties of additive manufactured thin-walled structures. One example is the miniaturisation effect, a microstructural effect that has been identified as one of the main drivers of the effective elasto-plastic properties of lightweight structures processed by additive manufacturing. The current work highlights the need to quantify further microstructural effects and to encourage combining them into mesostructural approaches in order to assess macrostructural effective properties. This multi-scale analysis of lattice structures is performed through a comparison between effective stiffness calculated through an analytical approach and compression tests of lattice structures, coupled with an investigation of the arrangement of their struts. In order to cover different potential loading scenarios, bending-dominated and stretch-dominated lattice structures made of the commonly used materials 316L and Ti6Al4V are considered, whereby the impact of microstructural phase transformation during processing is taken into account. Full article
(This article belongs to the Special Issue Additive Manufacturing of Cellular Structures Based on Metal Materials)
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