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

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.

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

Advanced Engineering Research ◽

10.23947/2687-1653-2021-21-4-328-336 ◽

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.

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Assessment of the Failure Process of Self-Compacting Concrete Modified With SIO2 Nanoparticles by Acoustic Emission Method

Proceedings of the Creative Construction Conference 2019 ◽

10.3311/ccc2019-014 ◽

2019 ◽

Author(s):

Paweł Niewiadomskia ◽

Jerzy Hoła

Keyword(s):

Acoustic Emission ◽

Failure Process ◽

Sio2 Nanoparticles ◽

Acoustic Emission Method ◽

Self Compacting Concrete ◽

Emission Method

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Experimental investigation of failure process in compressed channel-section GFRP laminate columns assisted with the acoustic emission method

Composite Structures ◽

10.1016/j.compstruct.2015.08.023 ◽

2015 ◽

Vol 133 ◽

pp. 921-929 ◽

Cited By ~ 24

Author(s):

Tomasz Kubiak ◽

Sylwester Samborski ◽

Andrzej Teter

Keyword(s):

Experimental Investigation ◽

Acoustic Emission ◽

Failure Process ◽

Acoustic Emission Method ◽

Emission Method ◽

Channel Section

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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.

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The effect of nano-additive TiO2 on the failure process of self-compacting concrete assessed using the acoustic emission method

MATEC Web of Conferences ◽

10.1051/matecconf/201817402003 ◽

2018 ◽

Vol 174 ◽

pp. 02003

Author(s):

Paweł Niewiadomski

Keyword(s):

Acoustic Emission ◽

Failure Process ◽

Physical And Mechanical Properties ◽

Test Method ◽

Acoustic Emission Method ◽

Emission Method ◽

Emission Signal ◽

Critical Stresses ◽

Literature Reviews ◽

The Impact

Due to the new challenges posed to engineering constructions, as well as the principles of sustainable development, many laboratories around the world are carrying out works to improve the basic structural material that is concrete. There has recently been a lot of interest in modifying concrete with nano-sized particles. Literature reviews indicate that their addition significantly improves the physical and mechanical properties of the concrete that was obtained with their use. Until now, there is no knowledge of the effect of nano-additives on the process of destroying temporarily compressed concrete. One test method that enables the parameters that describe the stress failure of concrete to be determined is the acoustic emission method. This work fills the gap in the literature and presents the results of the author's own research on the impact of the use of different amounts of nano-additive TiO2 on the failure process of selfcompacting concrete that was made solely on the basis of granite aggregate. The stress failure of the tested concrete was described using the stress levels (determined using the acoustic emission method) that initiate the cracking σi and critical stresses σcr that delimit the tested process. The descriptors that were used for this purpose are the rate of counts and the average effective value of the acoustic emission signal.

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