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Advances in Mechanical Characterization of Materials and Structures

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Materials Characterization".

Deadline for manuscript submissions: closed (20 July 2023) | Viewed by 1719

Special Issue Editor


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Guest Editor
Laboratory of Biological Structure Mechanics (LaBS)—Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering Giulio Natta, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
Interests: mechanics of materials; biomechanics; continuum mechanics

Special Issue Information

Dear Colleagues,

The design of mechanically reliable engineering devices requires an accurate knowledge of the properties of materials. This is particularly true when the characteristic size of the device, or of their features, is on the micro-scale such as in materials for electronics or for biomedical applications. In such cases, acquiring knowledge of the mechanical behaviour of materials and structure is less trivial if compared to macroscale material samples. Furthermore, the emergence of new manufacturing technologies in the area of the Additive Manufacturing techniques, poses new questions on the mechanical properties of materials which are strongly dependent on the process parameters. In recent years, new and advanced techniques for mechanical characterization have been introduced, such as in-situ micromechanical testing, which combines different laboratory techniques to determine complex mechanical responses on small samples. New experimental methods are needed to determine mechanical behaviour of microstructures suitably designed to obtain advanced physical and mechanical properties.

This special issue on Advances in Mechanical Characterization of Materials and Structures aims at bringing together experts from academia as well as from industry to share their latest advances in mechanical characterization of materials and structures including, but not limited to:

  • in-situ testing
  • digital image correlation techniques
  • new imaging techniques
  • micro-scale testing of materials

Dr. Pasquale Vena
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. 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 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 (2 papers)

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Research

19 pages, 2891 KiB  
Article
Metrological Comparison of Available Methods to Correct Edge-Effect Local Plasticity in Instrumented Indentation Test
by Jasurkhuja Kholkhujaev, Giacomo Maculotti, Gianfranco Genta and Maurizio Galetto
Materials 2023, 16(12), 4262; https://doi.org/10.3390/ma16124262 - 8 Jun 2023
Viewed by 1181
Abstract
The Instrumented Indentation Test (IIT) mechanically characterizes materials from the nano to the macro scale, enabling the evaluation of microstructure and ultra-thin coatings. IIT is a non-conventional technique applied in strategic sectors, e.g., automotive, aerospace and physics, to foster the development of innovative [...] Read more.
The Instrumented Indentation Test (IIT) mechanically characterizes materials from the nano to the macro scale, enabling the evaluation of microstructure and ultra-thin coatings. IIT is a non-conventional technique applied in strategic sectors, e.g., automotive, aerospace and physics, to foster the development of innovative materials and manufacturing processes. However, material plasticity at the indentation edge biases the characterization results. Correcting such effects is extremely challenging, and several methods have been proposed in the literature. However, comparisons of these available methods are rare, often limited in scope, and neglect metrological performance of the different methods. After reviewing the main available methods, this work innovatively proposes a performance comparison within a metrological framework currently missing in the literature. The proposed framework for performance comparison is applied to some available methods, i.e., work-based, topographical measurement of the indentation to evaluate the area and the volume of the pile-up, Nix–Gao model and the electrical contact resistance (ECR) approach. The accuracy and measurement uncertainty of the correction methods is compared considering calibrated reference materials to establish traceability of the comparison. Results, also discussed in light of the practical convenience of the methods, show that the most accurate method is the Nix–Gao approach (accuracy of 0.28 GPa, expanded uncertainty of 0.57 GPa), while the most precise is the ECR (accuracy of 0.33 GPa, expanded uncertainty of 0.37 GPa), which also allows for in-line and real-time corrections. Full article
(This article belongs to the Special Issue Advances in Mechanical Characterization of Materials and Structures)
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17 pages, 7534 KiB  
Article
Accurate Flow Characterization of A6082 for Precision Simulation of a Hot Metal Forming Process
by Jeong-Hwi Park, Su-Min Ji, Jeong-Muk Choi and Man-Soo Joun
Materials 2022, 15(23), 8656; https://doi.org/10.3390/ma15238656 - 5 Dec 2022
Cited by 3 | Viewed by 1182
Abstract
The flow behaviors of metallic materials are sensitive to state variables, including strain, strain rate, and temperature. In particular, the temperature effect on the flow behavior is of great importance. The flow information is usually obtained at the sample strain rates and temperatures [...] Read more.
The flow behaviors of metallic materials are sensitive to state variables, including strain, strain rate, and temperature. In particular, the temperature effect on the flow behavior is of great importance. The flow information is usually obtained at the sample strain rates and temperatures from the hot cylinder compression test. However, this test is inevitably exposed to undesirable effects of friction and temperature on flow characterization. This study reveals their impact on the flow curve of an A6082 alloy. The unique features of its flow behavior and the inaccuracy of as-received, primitive flow information are emphasized. Using a systematic way of correcting the friction and temperature effects, the flow curves with high accuracy in terms of the compression load–stroke curve obtained from the test are calculated. It was revealed that the both the friction and temperature compensation of the primitive flow curves bring a minor change in the flow curves of the A6082 alloy, which is quite different from other commercial light metals. This phenomenon caused by the unique features of the flow behavior of the A6082 or other aluminum alloys will be critical to solving various process and quality matters confronted by the engineers in the hot metal forming industry. Full article
(This article belongs to the Special Issue Advances in Mechanical Characterization of Materials and Structures)
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