Metals

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Special Issue Editors

Special Issue Information

Dear Colleagues,

Acoustic emission (AE) techniques have been successfully used as a non-destructive means for testing metallic materials and structures over the past 50 years. Driven by industrial demands, the AE technique has evolved as a powerful tool for integrity testing. With the advent of microelectronics, signal processing and information technologies, modern AE techniques have experienced rapid growth. In recent years, many publications have appeared, revisiting the classical topics of AE covering various aspects of foundations of AE phenomenon, understanding of which still leaves a lot to be desired. This Special Issue of Metals provides a platform for communication and exchange between AE professionals on AE basics and applications. We seek contributions covering a wide range of subjects related to AE phenomenon in metallic materials during their plastic deformation, degradation and fracture. Types of materials can cover a wide range of model metals, recently emerged advanced alloys, structural alloys and steels, which are widely used in industry, off-shore structures, etc. We seek advances in theoretical and modelling studies serving as guides for data analysis by laboratory experimentalists and in-field practitioners. Experiences with AE signal processing, proven for materials testing and characterization, are also welcomed.

This Special Issue is open to both original research articles and review articles covering all the relevant progress in these fields (though is not limited to the following):

Foundations of Acoustic Emission phenomenon
Acoustic Emission during fatigue
Applications of Acoustic Emission in fracture mechanics
Acoustic Emission during plastic deformation and fracture
Acoustic Emission during environmentally assisted degradation and fracture

Prof. Dr. Alexei Vinogradov
Prof. Antolino Gallego
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

acoustic emission
plastic deformation and fracture
signal processing
testing methods

Published Papers (2 papers)

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Research

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11 pages, 4084 KiB

Open AccessArticle

Characterization of Deformation Mechanisms in Mg Alloys by Advanced Acoustic Emission Methods

by Jan Čapek, Michal Knapek, Peter Minárik, Jan Dittrich and Kristián Máthis

Metals 2018, 8(8), 644; https://doi.org/10.3390/met8080644 - 16 Aug 2018

Cited by 17 | Viewed by 3474

Abstract

Adaptive sequential k-means (ASK) analysis of acoustic emission (AE) data was used to analyze the sources of AE during compression of three AZ31 magnesium samples with different initial texture. The results were compared to the classical hit-based approach. Observation of the deformed microstructure shows that the ASK analysis can distinguish very well between the signal originating in deformation twinning and dislocation slip. Moreover, together with microstructural analysis, the ASK algorithm revealed another source of AE for one of the samples, which was shown to be the double twinning. Full article

(This article belongs to the Special Issue Advances in Acoustic Emission Testing of Metals and Alloys)

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Graphical abstract

Review

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23 pages, 7939 KiB

Open AccessReview

Acoustic Emissions during Structural Changes in Shape Memory Alloys

by Dezső László Beke, Lajos Daróczi, László Zoltán Tóth, Melinda Kalmárné Bolgár, Nora Mohareb Samy and Anikó Hudák

Metals 2019, 9(1), 58; https://doi.org/10.3390/met9010058 - 09 Jan 2019

Cited by 11 | Viewed by 2933

Abstract

Structural changes (martensitic transformation, rearrangements of martensitic variants) in shape memory alloys have an intermittent character that is accompanied by the emission of different (thermal, acoustic, and magnetic) noises, which are fingerprints of the driven criticality, resulting in a damped power-law behaviour. We will illustrate what kinds of important information can be obtained on the structural changes in shape memory alloys. It was established that the power exponents of distributions of acoustic emission (AE) parameters (energy, amplitude, etc.), belonging to martensitic transformations, show quite a universal character and depend only on the symmetry of the martensite. However, we have shown that the asymmetry of the transformation (the exponents are different for the forward and reverse transformations) results in as large differences as those due to the martensite symmetry. We will also demonstrate how the recently introduced AE clustering method can help to identify the different contributions responsible for the asymmetry. The usefulness of the investigations of time correlations between the subsequent events and correlations between acoustic and magnetic noise events in ferromagnetic shape memory alloys will be demonstrated too. Finally, examples of acoustic and magnetic emissions during variant rearrangements (superplastic or superelastic behaviour) in the martensitic state will be described. Full article

(This article belongs to the Special Issue Advances in Acoustic Emission Testing of Metals and Alloys)

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