scholarly journals Localization and identification of gas infrastructure defects by acoustic emission

2019 ◽  
Vol 284 ◽  
pp. 08010
Author(s):  
Grzegorz Świt ◽  
Aleksandra Krampikowska
Keyword(s):  
Acoustic Emission ◽  
Cast Iron ◽  
Social Context ◽  
Computer Models ◽  
Technical Condition ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
User Expectations ◽  
Durability Assessment

Durability, reliability and usability are three foundations of reliable construction, crucial in economic and social context. Because localization and monitor of potential defect and assessment of its impact on condition of the construction are part of the durability assessment, we should develop appropriate methods, which would detect the beginning of technical condition process getting worse and could allow monitoring its progress during exploitation of the construction, not only at areas chosen subjectively or based on unverifiable computer models. One of this NDT methods complied with user expectations is acoustic emission method based on analysis of active destruction processes. The article presents results of AE applications to locate, monitor and identify destruction processes caused by exploitation burdens made to assessment the technical condition of gas infrastructure made from cast iron, steel and plastic.

scholarly journals Application and evaluation of the technical condition of composite materials in aircraft and unmanned aerial vehicles by acoustic emission method of nondestructive testing

2022 ◽  
Vol 21 (4) ◽  
pp. 328-336
Author(s):  
A. V. Popov ◽  
A. O. Samuylov ◽  
I. S. Cherepanov
Keyword(s):  
Acoustic Emission ◽  
Composite Materials ◽  
Nondestructive Testing ◽  
Unmanned Aerial Vehicles ◽  
Technical Condition ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Software Complex ◽  
Aerial Vehicles ◽  
Aerial Vehicle

Introduction. The paper analyzes the application of composite materials as the main determining method of reducing the mass of the airframe and an unmanned aerial vehicle. Advanced nondestructive testing methods provide assessing the technical condition of these materials, as well as determining stress concentrators on the airframe and an unmanned aerial vehicle with high accuracy in order to make a decision on the further operation of this object under control. The objective of the work was to increase the accuracy and efficiency of the assessment of crack resistance of composite materials through the acoustic emission control.Materials and Methods. This paper presents the nomenclature of composite materials used in the construction of various aircraft, including unmanned aerial vehicles. The most possible probable defects of these materials due to the influence of operational factors are presented. The applied methods of nondestructive testing of composite material and selection of the most suitable one according to specific advantages were compared. An experiment was carried out to determine the strength limits of carbon fiber using a hardware and software complex by acoustic emission method. The research results are presented in the form of drawings projected by the hardware and software complex.Results. The application of the acoustic-emission method of composite material control is described.Discussion and Conclusions. The results obtained experimentally can be used in the process of determining the strength limits of various composite materials by the acoustic emission method of nondestructive testing to assess the technical condition in mechanical engineering, shipbuilding, and aircraft construction. The paper is recommended to researchers involved in the design of aircraft and unmanned aerial vehicles.

scholarly journals Assessment of the technical condition of prefabricated elements using the acoustic emission method

2019 ◽  
Vol 28 (3) ◽  
pp. 356-365 ◽  
Author(s):  
Aleksandra Krampikowska ◽  
Anna Adamczak-Bugno
Keyword(s):  
Acoustic Emission ◽  
Prestressed Concrete ◽  
Technical Condition ◽  
Acoustic Emission Method ◽  
Material Degradation ◽  
Emission Method ◽  
Destructive Processes ◽  
Two Stages ◽  
The Impact ◽  
Concrete Elements

The article presents the results of tests using the acoustic emission method during the formation process of T-27 prestressed concrete beams. The studies included two stages. The first – testing the compressive strength of the cubic samples taken from the trial batch used for the production of beams together with the acquisition of acoustic emission signals. The second – measurements by acoustic emission, on the actual construction element during accelerated maturation of concrete caused by heating. The undertaking of the above subject results from the fact that this issue is of great importance when assessing the durability of reinforced concrete and pre-compressed elements in the aspect of the analysis of these structures in terms of durability. The impact of material degradation on the durability of the structure is difficult to appraise due to the lack of reliable results needed to estimate the durability of the selected statistical approach. However, the use of the acoustic emission method based on the identification of destructive processes creates the possibility of locating, identifying and monitoring the emerging and developing destructive processes affecting the durability of concrete elements.

scholarly journals Acoustic Emission Method for Locating and Identifying Active Destructive Processes in Operating Facilities

2018 ◽  
Vol 8 (8) ◽  
pp. 1295 ◽  
Author(s):  
Grzegorz Świt
Keyword(s):  
Acoustic Emission ◽  
Social Context ◽  
Structural Reliability ◽  
Life Assessment ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Entire Volume ◽  
Deterioration Process ◽  
Potential Damage ◽  
Destructive Processes

Durability, safety, and usability are the three foundations of structural reliability, vital in the economic and social context. As the locating and tracking of potential damage and evaluating its impact on the condition of the structure are part of service life assessment, relevant methods should be developed that would detect the onset of the deterioration process and enable the monitoring of its progress within the entire volume of the structure, not only in the areas selected in a subjective way. The acoustic emission (AE) method relying on the analysis of active destructive processes can be the best choice. This article reports the results of the application of the AE method for identifying active destructive processes and tracking their development during the routine operation of various types of structures.

scholarly journals Monitoring of the Impact of Lithium Nitrate on the Alkali–aggregate Reaction Using Acoustic Emission Methods

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 20
Author(s):  
Justyna Zapała-Sławeta ◽  
Grzegorz Świt
Keyword(s):  
Acoustic Emission ◽  
Initial Reaction ◽  
Lithium Nitrate ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Acoustic Activity ◽  
Initial Stage ◽  
Chemical Admixture ◽  
Different Characteristics ◽  
The Impact

The study analyzed the possibility of using the acoustic emission method to analyse the reaction of alkali with aggregate in the presence of lithium nitrate. Lithium nitrate is a chemical admixture used to reduce adverse effects of corrosion. The tests were carried out using mortars with reactive opal aggregate, stored under the conditions defined by ASTM C227. The acoustic activity of mortars with a corrosion inhibitor was referred to linear changes and microstructure of specimens in the initial reaction stages. The study found a low acoustic activity of mortars with lithium nitrate. Analysis of characteristic parameters of acoustic emission signals, combined with the observation of changes in the microstructure, made it possible to describe the corrosion processes. As the reaction progressed, signals with different characteristics were recorded, indicating aggregate cracking at the initial stage of the reaction, followed by cracking of the cement paste. The results, which were referred to the acoustic activity of reference mortars, confirmed that the reaction of opal aggregate with alkali was mitigated in mortars with lithium nitrate, and the applied acoustic emission method enabled the detection and monitoring of ASR progress.

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