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

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.

Download Full-text

Nondestructive Testing and Structural Condition Monitoring of Mechanical Cables

Applied Mechanics Reviews ◽

10.1115/1.3120320 ◽

1993 ◽

Vol 46 (4) ◽

pp. 133-138 ◽

Cited By ~ 6

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.

Download Full-text

The Characteristic Features of Composite Materials Specimen’s Static Fracture Investigated by the Acoustic Emission Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.232.28 ◽

2012 ◽

Vol 232 ◽

pp. 28-32 ◽

Cited By ~ 1

Author(s):

Alexander Urbahs ◽

Mukharbiy Banov ◽

Vladislav Turko ◽

Kristine Tsaryova

Keyword(s):

Acoustic Emission ◽

Composite Materials ◽

Failure Process ◽

Unidirectional Composite ◽

Deformation Curve ◽

Acoustic Emission Method ◽

Emission Method ◽

Static Fracture ◽

Three Stages ◽

Characteristic Features

The work is dedicated to the experimental study of micromechanics process of unidirectional composite materials’ specimens under static loading till its fracture using acoustic emission method compared with the strain-load deformation curve. An attempt is made to identify subtle effects of the failure process of the composite material which is impossible using the traditional methods of the strain measurement. The prospect of applying the method of acoustic emission (AE) for the development and improvement of existing methods of model tense- analysis is shown. The characteristic stages of the damage accumulation for unidirectional composites’ specimens and the effect of training on these processes are shown experimentally. It’s shown that the AE-deformation diagram have three stages in contrast to commonly used load-strain deformation curve with one stage. So it become possible to investigate the physical process of composite unit’s fracture under static load.

Download Full-text

Localization and identification of gas infrastructure defects by acoustic emission

MATEC Web of Conferences ◽

10.1051/matecconf/201928408010 ◽

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.

Download Full-text

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

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska ◽

10.22630/pniks.2019.28.3.33 ◽

2019 ◽

Vol 28 (3) ◽

pp. 356-365 ◽

Cited By ~ 1

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.

Download Full-text

Методи діагностування дефектів деталей авіаційних двигунів з композиційних матеріалів

Aerospace technic and technology ◽

10.32620/aktt.2021.4sup1.14 ◽

2021 ◽

pp. 102-109

Author(s):

Володимир Олександрович Пальчиковський ◽

Андрій Володимирович Морозов ◽

Юрій Іванович Торба

Keyword(s):

Acoustic Emission ◽

Composite Materials ◽

Defect Detection ◽

Static Load ◽

Thermal Testing ◽

Local Defect ◽

Acoustic Emission Method ◽

Emission Method ◽

Engine Operation ◽

X Ray

The key priority in improving the technical and economic performance of gas turbine engines lays in the use of new composite materials. The use of composites in the components of critical load-carrying structures operating under static and dynamic loads during long service lives determines the need to predict the component lives. Also, in order to increase the safety of engine operation and improve the parts manufacturing process, timely defect detection in such structures is of great importance. This article is devoted to the detection of the composite parts defects and damages that occur at different stages of manufacturing and operation. The aim is to investigate the existing methods of non-destructive testing of composite materials, describe their functional concept, and determine the field of their application. The article considers acoustic, thermal, optical, and radiation testing methods. Among the acoustic methods, the phased array method is selected as the most informative and multipurpose. The acoustic emission method is also selected; it will allow real-time monitoring of defect growth during testing. Out of thermal methods, the vibrothermography method was selected as the most advanced among the thermographic sub-methods. It allows using the phenomenon of local defect resonance and thus ensures effective defect detection. Shearography is selected for investigation out of optical methods. The special aspects of the use of X-ray methods are considered through the example of X-ray computed tomography. It is concluded that the approach combining several methods can significantly increase the efficiency of defect detecting and help to assess their criticality. Active thermal testing is well suited for fast scanning of large-sized parts and searching for areas of defect accumulation. In the following, local methods, such as impedance, vibrothermography, or one of the ultrasonic, should be used. To measure deformations under static load, it is a good practice to use shearography. To identify progressive defects under static load, it makes sense to use the acoustic emission method.

Download Full-text