Application of the Acoustic Emission Method for Estimating the Residual Life of Elastic Elements at the Stage of Preparing a Product for Operation

2022 ◽  
Vol 1049 ◽  
pp. 289-294
Author(s):  
Evgeny Remshev ◽  
Artem Gusev ◽  
Sergey Voinash ◽  
Irina Vornacheva ◽  
Alexander Scherbakov ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Residual Life ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Non Destructive ◽  
Elastic Elements ◽  
Experimental Substantiation

The article discusses the experimental substantiation of predicting the operational properties of elastic elements by the acoustic emission (AE) method, as well as the use of the non-destructive method of acoustic emission as an element of digital certification of critical mechanical and instrument engineering products.

The Assessment of High-Temperature Degraded Concrete Specimens of Different Mixtures by Acoustic Emission Method during Three-Point Bending Test and Pulse Velocity Method in Comparison with Destructive Tests

2017 ◽  
Vol 908 ◽  
pp. 88-93 ◽  
Author(s):  
Libor Topolář ◽  
Richard Dvořák ◽  
Luboš Pazdera
Keyword(s):  
Acoustic Emission ◽  
Building Materials ◽  
Pulse Velocity ◽  
Bending Test ◽  
Structural Components ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Three Point Bending ◽  
Live Loads ◽  
Non Destructive

One of the advantages of concrete over other building materials is its inherent fire-resistive properties. The concrete structural components still must be able to withstand dead and live loads without collapse even though the rise in temperature causes a decrease in the strength and modulus of elasticity for concrete and steel reinforcement. In addition, fully developed fires cause expansion of structural components and the resulting stresses and strains must be resisted. This paper reports the results of measurements by Acoustic Emission method during three-point bending test on concrete specimens. The Acoustic emission method is a non-destructive technique used widely for structural health monitoring purposes of structures. The sensors are mounted by beeswax on the surface of the material or structure to record the motion of the surface under the elastic excitation of the cracking sources. The concrete specimens were heated in a programmable laboratory furnace at a heating rate of 5 °C/min. The specimens were loaded at six temperatures, 200 °C, 400 °C, 600 °C, 800 °C, 1000 °C, and 1200 °C maintained for 60 minutes. The results are obtained in the laboratory.

Nondestructive Testing and Structural Condition Monitoring of Mechanical Cables

1993 ◽  
Vol 46 (4) ◽  
pp. 133-138 ◽  
Author(s):  
Patricio A. A. Laura
Keyword(s):  
Acoustic Emission ◽  
Nondestructive Testing ◽  
Condition Monitoring ◽  
Structural Condition ◽  
Non Destructive Testing ◽  
Acoustic Emission Method ◽  
Testing Methods ◽  
Emission Method ◽  
Destructive Testing ◽  
Non Destructive

This article concerns the problem of evaluating the `structural health’ of cables or ropes by means of non-destructive testing methods. Special emphasis is placed upon electromagnetic techniques and the acoustic emission method.

Acoustic Emission Method for Monitoring Corrosion Reactions

CORROSION ◽  
1976 ◽  
Vol 32 (4) ◽  
pp. 121-126 ◽  
Author(s):  
T. W. RETTIG ◽  
M. J. FELSEN
Keyword(s):  
Acoustic Emission ◽  
Non Destructive Testing ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Destructive Testing ◽  
Corrosion Reaction ◽  
Reaction Processes ◽  
Non Destructive ◽  
Corrosion Research

Abstract There is a continuing need for new test techniques to follow corrosion reaction processes and to predict long-term materials performance in aggressive environments. Additionally, there is a growing awareness of the importance of applying non-destructive inspection to determine the presence of corrosion in non-visible areas of equipment and structures. The possibilities of utilizing acoustic emission for a broad range of applications in the study of these problems were explored. Proprietary methods were developed to follow corrosion reactions and to monitor corrosion of simulated and actual structures. These experiments point out the applicability of acoustic emission as a sensitive new tool for corrosion research and non-destructive testing (NDT) in corrosion prone structures and equipment.

scholarly journals Quality control of hardening technologies using the acoustic emission method

2021 ◽  
Vol 266 ◽  
pp. 04004
Author(s):  
E.V. Grigoriev ◽  
A.G. Palaev ◽  
T.S. Golikov ◽  
V.V. Nosov
Keyword(s):  
Quality Control ◽  
Acoustic Emission ◽  
Service Life ◽  
Experimental Research ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Industrial Facilities ◽  
Non Destructive

The ways of increasing the reliability and service life of industrial facilities are considered. The types of hardening technologies and methods of their control are analyzed. An approach that makes it possible to evaluate the quality of hardening technologies based on the registration of acoustic emission (AE) is described. The results of experimental research on the quality of three types of strengthening technologies are presented and the effectiveness of the proposed approach is shown. The obtained results can be used to assess hardening technologies at real facilities in a non-destructive way.

The Classification of Cracks Recorded during the Cyclic Loading of the Reinforced Concrete Beam by Acoustic Emission Method

2018 ◽  
Vol 776 ◽  
pp. 66-69
Author(s):  
Libor Topolář ◽  
Luboš Pazdera ◽  
Michaela Hoduláková ◽  
Karel Mikulášek ◽  
Peter Orolin ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Wave Radiation ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Non Destructive

Non-destructive testing is a process of inspecting, testing, and evaluating materials, components or assemblies for discontinuities, or differences in characteristics without destroying the serviceability of a system or its part. The acoustic non-destructive methods are concerned with the state-of-the-art situation in the field of experimental studies of the physical properties of engineering materials. In this paper, the acoustic emission method was used for classification of cracks recorded during the cyclic loading of the reinforced concrete beam. Acoustic emission is a phenomenon of stress wave radiation caused by the dynamic reconstruction of material’s structure that accompanies processes of deformation and fracture. Crack propagation is one of the macroscopic sources of acoustic emission. Acoustic emission signals generated by different loading patterns can provide valuable information concerning the structural integrity of a material. Load levels that have been previously exerted on a material do not produce acoustic emission activity.

scholarly journals Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1230
Author(s):  
Libor Topolář ◽  
Dalibor Kocáb ◽  
Luboš Pazdera ◽  
Tomáš Vymazal
Keyword(s):  
Acoustic Emission ◽  
Complex Analysis ◽  
Concrete Block ◽  
Dominant Frequency ◽  
Significant Shift ◽  
Acoustic Emission Method ◽  
Freezing And Thawing ◽  
Emission Method ◽  
Freeze Thaw ◽  
Non Destructive

This manuscript deals with a complex analysis of acoustic emission signals that were recorded during freeze-thaw cycles in test specimens produced from air-entrained concrete. An assessment of the resistance of concrete to the effects of freezing and thawing was conducted on the basis of a signal analysis. Since the experiment simulated testing of concrete in a structure, a concrete block with the height of 2.4 m and width of 1.8 m was produced to represent a real structure. When the age of the concrete was two months, samples were obtained from the block by core drilling and were subsequently used to produce test specimens. Testing of freeze-thaw resistance of concrete employed both destructive and non-destructive methods including the measurement of acoustic emission, which took place directly during the freeze-thaw cycles. The recorded acoustic emission signals were then meticulously analysed. The aim of the conducted experiments was to verify whether measurement using the acoustic emission method during Freeze-thaw (F-T) cycles are more sensitive to the degree of damage of concrete than the more commonly employed construction testing methods. The results clearly demonstrate that the acoustic emission method can reveal changes (e.g., minor cracks) in the internal structure of concrete, unlike other commonly used methods. The analysis of the acoustic emission signals using a fast Fourier transform revealed a significant shift of the dominant frequency towards lower values when the concrete was subjected to freeze-thaw cycling.

Quantification of Micro-Cracks by Acoustic Emission Method during Setting and Hardening of Concrete

2014 ◽  
Vol 1000 ◽  
pp. 199-202
Author(s):  
Libor Topolář
Keyword(s):  
Acoustic Emission ◽  
Civil Engineering ◽  
Construction Material ◽  
Analysis Method ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Interesting Part ◽  
Micro Cracks ◽  
Destructive Analysis ◽  
Non Destructive

As a non-traditional, non-destructive analysis method, the Acoustic Emission Method was used for civil engineering experiment. Concrete is a composite construction material frequently used in civil engineering. We know that concrete is like a man – when concrete is made it is like a baby, then it ages and its properties change in accordance to its baby life. That means it is better to monitor and change its properties when it is young as soon as possible. However, using methods immediately after concrete birth (making the mixture) is difficult. The main aim of the article is to show the application of Acoustic Emission Method during concrete lifetime, particularly during the first days after mixing the mixture. Article describes monitoring concrete structure for 20 days since their making up. Primary interesting part is during first day of hardening. Acoustic Emission Method has used for monitoring both samples. Expected result has been between covered and uncovered specimen.

scholarly journals Features of Noise Filtering During Acoustic Emission Testing

2019 ◽  
Vol 9 (1) ◽  
pp. 3977-3980
Keyword(s):  
Acoustic Emission ◽  
Acoustic Noise ◽  
Low Noise ◽  
Non Destructive Testing ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Destructive Testing ◽  
Emission Testing ◽  
Acoustic Emission Testing ◽  
Non Destructive

This article discusses the problems of the acoustic emission method of non-destructive testing. An approach to filtering noise arising from monitoring of acoustic emission is considered. The filtering of acoustic noise is one of the key problems of the acoustic emission method, since the low noise immunity of the acoustic emission method prevents the expansion of its industrial application. The complexity of the filtering is explained by the fact that the waveform and spectrum of acoustic emission pulses change depending on the distance between the defect, which is the source of acoustic emission waves, and the sensor. In turn, the interference, as a rule, is non-stationary in nature and is determined by the type of technological process of the tested composition. This article discusses various types of noise processes, both stationary and non-stationary. The signal and noise parameters are compared, based on which recommendations are given for constructing algorithms for detecting acoustic emission pulses against a background of noise.

scholarly journals Determining the Characteristics of Acoustic Emission in the Fatigue Crack Growth of Aluminum Alloy 2025 for Online Structural Monitoring

2021 ◽  
Author(s):  
Javad Sharifi Ghaderi
Keyword(s):  
Acoustic Emission ◽  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Cracks ◽  
Structural Monitoring ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Non Destructive

In the use of metals, due to industrial advances and the application of more dynamic loads, it is necessary to pay more attention to the fatigue issue. Non-destructive inspection methods are used to condition and health monitoring of structures at the time of production and even during the service life of parts. Among non-destructive methods, the acoustic emission method has become a standard and reliable method in recent years. In this project, the characteristics of acoustic emission in the fatigue crack growth of aluminum alloy 2025 for online structural monitoring have been investigated and determined. Acoustic emission tests have been performed in two parts: bending fatigue test with the aim of initiation of fatigue cracks in aluminum alloy 2025 specimens and following tensile tests with the aim of growth of fatigue cracks. The acoustic emission signals and parameters sent by the acoustic emission sensor during both tests were received and recorded by the acoustic emission software. According to the received acoustic emission information, various diagrams are plotted. Analyzing the results from online acoustic emission monitoring showed, the acoustic emission method can be considered as a suitable and reliable technique for detecting crack initiation and crack growth in aluminum alloy 2025.

scholarly journals ACOUSTIC EMISSION TESTING OF FIBERGLASS PIPES AND FITTINGS

2021 ◽  
pp. 12-25
Author(s):  
S. V. Elizarov ◽  
D. A. Terentyev ◽  
K. A. Medvedev ◽  
V. I. Ivanov ◽  
A. G. Halimov ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Residual Life ◽  
Early Stage ◽  
Experimental Studies ◽  
Operating Mode ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Dimensional Inspection ◽  
Emission Testing ◽  
Acoustic Emission Testing

Experimental studies was carried out. The purpose was to develop a method to test fiberglass pipelines in operating mode. The acoustic emission method was chosen as the main method of nondestructive testing, and visual and dimensional inspection was chosen as an additional method. Acoustic parameters and acoustic emission properties of fiberglass pipes were determined. It was found that acoustic emission sensors can be installed at distances of up to 9-18 m from each other. A series of loading tests was carried out to refine the methodology. Every loading case was performed until leakage registration. In most cases, leakage occurred near the fillet at pressures of 2.2…3.0 from the working pressure, which indicates a large margin of safety for fiberglass pipes. It is confirmed that the acoustic emission method allows early defect detection. Based on the acoustic emission data, 4 main stages of fiberglass pipes degradation were identified. Visual and dimensional inspection was informative only at stages III – IV. Stage IV in most cases corresponds to the leakage. Even early stage of depressurization was registered as continuous acoustic emission. Signals with amplitudes exceeding 60…80 dB were registered at all loading stages. The location map became informative after filtering events by acoustic emission parameters. A methodology for the testing of fiberglass pipes and fittings in operating mode was developed. It contains, in contrast to the currently valid standards, specific numerical values of various quantities related to both the preparation and carrying out of acoustic emission testing and the classification of the identified sources of acoustic emission according to the degree of danger and allows to evaluate the residual life of fiberglass pipelines. The most informative parameter was the activity of acoustic emission; therefore, it is recommended to carry out loading without holding the pressure. It is planned to carry out additional experiments to clarify the mechanisms of fracture acting at each of the 4 identified stages of degradation.

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