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Metals
Special Issues
Microlattices: New Cellular Materials for Lightweight Design
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Microlattices: New Cellular Materials for Lightweight Design

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

Deadline for manuscript submissions: closed (20 February 2020)

Special Issue Editor

Dr. Peifeng Li

E-Mail Website
Guest Editor
James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK
Interests: light alloys; steel; porous materials; advanced manufacturing; mechanical property; modelling and characterisation

Special Issue Information

Dear Colleagues,

Cellular materials are widely used in transport applications where weight savings are a critical design consideration, as well as in thermal, acoustic, biomedical and many other functional applications. Microlattices, characterised by regular unit cell topologies, are a special type of cellular materials. Due to their geometrically periodic nature, metallic microlattices are more desirable than open-cell stochastic metal foams for many applications. In particular, recent developments in advanced manufacturing technologies (e.g., additive manufacturing) enable the fabrication of lighter metallic microlattices with more complicated architectures and better controllability of properties/functionalities. This Special Issue aims to highlight the state-of-the-art research on metallic microlattices and their applications. The scope of the issue will cover all aspects of microlattices, including their manufacturing techniques, microstructure, properties (mechanical, thermal, fluid flow, acoustic and others), topological design and optimisation, and applications. Contributions including reviews, regular research papers and short communications are all welcome.

Dr. Peifeng Li
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

  • Microlattices
  • Manufacturing
  • Microstructure
  • Mechanical property
  • Heat transfer
  • Fluid flow
  • Acoustic property
  • Topological design and optimisation
  • Modelling and simulation
  • Applications

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

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Research

14 pages, 5928 KiB  
Article
Compressive Properties of Additively Manufactured Functionally Graded Kagome Lattice Structure
by Rinoj Gautam and Sridhar Idapalapati
Metals 2019, 9(5), 517; https://doi.org/10.3390/met9050517 - 3 May 2019
Cited by 27 | Viewed by 5865
Abstract
Cellular lattice structures have important applications in aerospace, automobile and defense industries due to their high specific strength, modulus and energy absorption. Additive manufacturing provides the design freedom to fabricate complex cellular structures. This study investigates the compressive properties and deformation behavior of [...] Read more.
Cellular lattice structures have important applications in aerospace, automobile and defense industries due to their high specific strength, modulus and energy absorption. Additive manufacturing provides the design freedom to fabricate complex cellular structures. This study investigates the compressive properties and deformation behavior of a Ti-6Al-4V unit Kagome structure fabricated by selective laser melting. Further, the mechanical performance of multi-unit and multi-layer Kagome structure of acrylonitrile butadiene styrene (ABS) ABS-M30™ manufactured by fused deposition modeling is explored. The effect of a number of layers of Kagome structure on the compressive properties is investigated. This paper also explores the mechanical properties of functionally graded and uniform density Kagome structure. The stiffness of the structure decreased with the increase in the number of layers whereas no change in peak load was observed. The functionally graded Kagome structure provided 35% more energy absorption than the uniform density structure. Full article
(This article belongs to the Special Issue Microlattices: New Cellular Materials for Lightweight Design)
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16 pages, 7015 KiB  
Article
Microstructure, Mechanical Properties, and Constitutive Models for Ti–6Al–4V Alloy Fabricated by Selective Laser Melting (SLM)
by Pan Tao, Jiangwei Zhong, Huaixue Li, Quandong Hu, Shuili Gong and Qingyan Xu
Metals 2019, 9(4), 447; https://doi.org/10.3390/met9040447 - 16 Apr 2019
Cited by 38 | Viewed by 5883
Abstract
The mechanical performances and microstructure of Ti–6Al–4V built by selective laser melting were evaluated by optical microscopy, transmission electron microscopy, and room temperature tensile testing, and compared with the wrought and as-cast material. The flow behavior of the as-produced Ti–6Al–4V at temperatures varying [...] Read more.
The mechanical performances and microstructure of Ti–6Al–4V built by selective laser melting were evaluated by optical microscopy, transmission electron microscopy, and room temperature tensile testing, and compared with the wrought and as-cast material. The flow behavior of the as-produced Ti–6Al–4V at temperatures varying from 700–900 °C at an interval of 50 °C and strain rates ranging from 10−2–101 s−1 was experimentally acquired. According to the experimental measurement, the Johnson–Cook, modified Arrhenius model, and artificial neural network were constructed. A comparative investigation on the predictability of established models was performed. The as-produced microstructure is made up of non-equilibrium martensite and columnar grains, leading to higher strength and lower ductility with respect to the conventional material. In room temperature tensile tests, the SLMed Ti–6Al–4V shows the characteristics of continuous yielding and unobvious work-hardening. The flow stress rapidly reaches the peak, and the softening rate depends on the strain rates and deformed temperatures in hot compression. The Johnson–Cook model could well predict the flow stress during quasi-static tensile deformation, but the model constants might vary with the process conditions. For dynamic compression, the artificial neural network exhibits higher accuracy to fit the flow stress of SLMed Ti–6Al–4V, and higher error to predict the conditions out of the model data, compared to the modified Arrhenius model involving the compensation of strain rate and strain. Full article
(This article belongs to the Special Issue Microlattices: New Cellular Materials for Lightweight Design)
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