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Applied Sciences
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Advances in Acoustic Emission Technique: Tests Interpretation and Numerical Simulations
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Advances in Acoustic Emission Technique: Tests Interpretation and Numerical Simulations

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Acoustics and Vibrations".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 3524

Special Issue Editors

Prof. Dr. Giuseppe Lacidogna

E-Mail Website
Guest Editor
Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy
Interests: nondestructive testing (NDT); acoustic emission; electromagnetic emission; critical phenomena in structural mechanics; critical phenomena in geophysics; fracture mechanics; static and dynamic analysis of high-rise buildings
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Ignacio Iturrioz

E-Mail Website
Guest Editor
Mechanical Department, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
Interests: acoustic emission; peridynamics; discrete element methods; bundle model; distint method; fracture of solids

Special Issue Information

Dear Colleagues,

The Acoustic Emission (AE) technique is a known procedure to obtain information about the critical conditions of structural systems. This system could be a tectonic plate with a characteristic length of km or an electronics device having a length of millimeters. The excitation that produces the acoustic emission events could be induced by different sources, including forces or other mechanical excitation. Several global parameters could be computed using the AE data, and it is known that the evolution of these parameters in particular circumstances defines when and how the structural damage process evolves to collapse.

Generally, it is not possible to prove a bidirectional, unique link between the AE signals and the damage process. For this reason, the numerical simulation of this kind of mechanisms could furnish useful information to aid in the interpretation of the AE experimental tests.

Several strategies could be used, from the classical Finite Element Model approaches to Discrete Element procedures, such as Peridinamics, or other similar strategies where the possibilities of simulating spontaneous fractures could be more naturally captured. Morever, the information for that methods, where the geometry and boundary condition of specific problems is eliminated, could be extremely important to concentrate the attention on the aspect of the collapse process systems. Methods based on Bundle Models and Fuse Models are examples of these approaches. We consider that meeting contributions with this profile could be useful for the scientific community.

Prof. Dr. Giuseppe Lacidogna
Prof. Dr. Ignacio Iturrioz
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. Applied Sciences 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 2400 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

  • structural health monitoring
  • damage
  • nondestructive testing
  • wave propagations
  • acoustic emission
  • fracture mechanics
  • numerical simulations
  • mechanics theory and modelling

Published Papers (4 papers)

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Research

19 pages, 6048 KiB  
Article
The Characteristics of Acoustic Emissions Due to Gas Leaks in Circular Cylinders: A Theoretical and Experimental Investigation
by Kwang Bok Kim, Jun-Hee Kim, Je-Eon Jin, Hae-Jin Kim, Chang-Il Kim, Bong Ki Kim and Jun-Gill Kang
Appl. Sci. 2023, 13(17), 9814; https://doi.org/10.3390/app13179814 - 30 Aug 2023
Viewed by 609
Abstract
An acoustic emission (AE) is caused by the sudden release of energy by a material as a result of material degradation related to deformations, cracks, or faults within a solid. The same situation also occurs in leaks caused by turbulence in the fluid [...] Read more.
An acoustic emission (AE) is caused by the sudden release of energy by a material as a result of material degradation related to deformations, cracks, or faults within a solid. The same situation also occurs in leaks caused by turbulence in the fluid around the leak. In this study, analytical modeling for an AE due to leakage through a circular pinhole in a gas storage cylinder was performed. The displacement fields responsible for AEs, excited by the concentrated force (CF) associated with the turbulent flow though the pinhole, were derived by solving the Navier–Lamé equation. The CF as an excitation source was formulated in terms of a fluctuating Reynolds stress (FRS) and spatial Green’s function. In particular, a series of experiments were conducted under different operating conditions to explore the characteristics of the AE signals due to leak in a gas cylinder. Finally, the simulation and experimental results were compared to verify the accuracy of the simulation results. Full article
(This article belongs to the Special Issue Advances in Acoustic Emission Technique: Tests Interpretation and Numerical Simulations)
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20 pages, 5210 KiB  
Article
Experimental Study on the Damage Mechanism of Reinforced Concrete Beams Based on Acoustic Emission Technique
by Jianqing Bu, Zhibo Guo, Jiren Zhang and Yanzhe Zhang
Appl. Sci. 2023, 13(16), 9207; https://doi.org/10.3390/app13169207 - 13 Aug 2023
Viewed by 550
Abstract
The purpose of this paper is to investigate the developmental process of internal damage in prestressed concrete beams under static loading conditions. We conducted static loading tests on two prestressed reinforced concrete beams and one ordinary reinforced concrete beam. Acoustic emission (AE) technology [...] Read more.
The purpose of this paper is to investigate the developmental process of internal damage in prestressed concrete beams under static loading conditions. We conducted static loading tests on two prestressed reinforced concrete beams and one ordinary reinforced concrete beam. Acoustic emission (AE) technology was employed to dynamically monitor the entire process of the test beams simultaneously. The energy and ring count AE characteristic parameters were studied, and the frequency domain characteristics of acoustic emission signals from three test beams were analyzed. The actual failure process of the test beams was compared with the AE characteristic parameters and the waveform frequency distribution. Furthermore, the corresponding relationships between the actual failure process and the AE characteristic parameters were analyzed. Additionally, the frequency distribution of waveforms was examined. The obtained data, including deflection, strain, and prestress variation within the beams, were combined with theoretical calculations to explore the damage development law of simply supported reinforced concrete beams during the entire failure process. Comparative studies revealed a strong correlation between the actual failure processes of the three test beams and the AE characteristic parameters as well as the waveform frequency distribution. The strain variation trend of the ordinary reinforced concrete beam closely matched the AE signal characteristics, with the critical load often occurring at around 40% of the ultimate load. The strain and deflection variations of the prestressed reinforced concrete beams exhibited a robust correspondence with the AE signal characteristics. The critical load typically manifested at approximately 80% of the ultimate load. The ultimate load of the prestressed reinforced concrete beams decreased by approximately 20% under cyclic loading conditions compared to hierarchical loading. Full article
(This article belongs to the Special Issue Advances in Acoustic Emission Technique: Tests Interpretation and Numerical Simulations)
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19 pages, 25269 KiB  
Article
Truss-like Discrete Element Method Applied to Damage Process Simulation in Quasi-Brittle Materials
by Boris Nahuel Rojo Tanzi, Gabriel Birck, Mario Sobczyk, Ignacio Iturrioz and Giuseppe Lacidogna
Appl. Sci. 2023, 13(8), 5119; https://doi.org/10.3390/app13085119 - 20 Apr 2023
Cited by 1 | Viewed by 757
Abstract
This paper discusses the combined application of the lattice discrete element method (LDEM) and the acoustic emission (AE) technique to analyze damage in quasi-brittle materials. These methods were used to study the damage in a concrete slab under pure-shear stress and a pre-fissured [...] Read more.
This paper discusses the combined application of the lattice discrete element method (LDEM) and the acoustic emission (AE) technique to analyze damage in quasi-brittle materials. These methods were used to study the damage in a concrete slab under pure-shear stress and a pre-fissured sandstone beam subjected to three-point bending. The first test was restricted to simulation results, whereas the second included experimental data. The discrete element method was used to perform the simulations for both tests, whereas the corresponding results and the information from the experiments were assessed using AE analysis tools. It was shown that the synergistic use of these two methods led to a comprehensive understanding of the two analyzed cases and offered an effective, generalizable approach for assessing damage processes in quasi-brittle materials. Full article
(This article belongs to the Special Issue Advances in Acoustic Emission Technique: Tests Interpretation and Numerical Simulations)
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14 pages, 7964 KiB  
Article
Failure Modelling of CP800 Using Acoustic Emission Analysis
by Eugen Stockburger, Hendrik Wester and Bernd-Arno Behrens
Appl. Sci. 2023, 13(6), 4067; https://doi.org/10.3390/app13064067 - 22 Mar 2023
Cited by 2 | Viewed by 917
Abstract
Advanced high-strength steels (AHHS) are widely used in many production lines of car components. For efficient design of the forming processes, numerical methods are frequently applied in the automotive industry. To model the forming processes realistically, exact material data and analytical models are [...] Read more.
Advanced high-strength steels (AHHS) are widely used in many production lines of car components. For efficient design of the forming processes, numerical methods are frequently applied in the automotive industry. To model the forming processes realistically, exact material data and analytical models are required. With respect to failure modelling, the accurate determination of failure onset continues to be a challenge. In this article, the complex phase (CP) steel CP800 is characterised for its failure characteristics using tensile tests with butterfly specimens. The material failure was determined by three evaluation methods: mechanically by a sudden drop in the forming force, optically by a crack appearing on the specimen surface, and acoustically by burst signals. As to be expected, the mechanical evaluation method determined material failure the latest, while the optical and acoustical methods showed similar values. Numerical models of the butterfly tests were created using boundary conditions determined by each evaluation method. A comparison of the experiments, regarding the forming force and the distribution of the equivalent plastic strain, showed sufficient agreement. Based on the numerical models, the characteristic stress states of each test were evaluated, which showed similar values for the mechanical and optical evaluation method. The characteristic stress states derived from the acoustical evaluation method were shifted to higher triaxialities, compared to the other methods. Matching the point in time of material failure, the equivalent plastic strain at failure was highest for the mechanical evaluation method, with lower values for the other two methods. Furter, three Johnson–Cook (JC) failure models were parametrised and subsequently compared. The major difference was in the slope of the failure models, of which the optical evaluation method showed the lowest slope. The reasons for the differences are the different stress states and the different equivalent plastic strains due to different evaluation areas. Full article
(This article belongs to the Special Issue Advances in Acoustic Emission Technique: Tests Interpretation and Numerical Simulations)
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