№ 1(59) - март 2013

Тема номера: Acoustic Emission

Acoustic Emission

Yu. P. Borodin, V. G. Kharebov
Acoustic Emission: Yesterday, Today, Tomorrow

Acoustic emission method of NDT is relatively young in comparison, for example, with ultrasonic or X-Ray methods. But for such a short time it has gained a wide popularity due to its unique features, progress in the field of electronics, insight into mysteries of material fracture mechanics as well as its ability to give answers to the most complicated questions connected with processes of defect creation and development.

V. I. Ivanov
Acoustic Emission Signals: Models and Interpretations

An attempt to revive interest in the fundamental problem of acoustic emission (AE) signal is made in the article. Signal models within the whole range of scales and forms of representation are listed – from quantum-mechanical models to an AE-image of the tested object revealed by parameters of AE signals. Actuality of different models and their completeness level are indicated.

D. A. Zotov, S. V. Kamensky, E. S. Trofimov
Main Application Aspects of Acoustic Emission Method at Diagnostics of Compressor Stations Technological Pipelines

Main technical and methodological problems of acoustic emission method application for compressor stations technological pipelines nondestructive testing are considered in the article.

G. A. Bigus, Yu. P. Borodin, A. A. Travkin
Acoustic Emission Method for Fatigue Processes Investigation

Experimental studies of materials with application of an acoustic emission method have been carried out. Stages of accumulation and growth of fatigue cracks were identified. Different stages of deformation process enable the moment of microdeformation initiation and its further conversion to be predicted.

V. A. Shaporev, Yu. S. Popkov
Complex Diagnosis Monitoring Systems for Hazardous Industrial Facilities

The article deals with an algorithm for construction of monitoring systems for hazardous industrial and civil facilities. The role of the acoustic emission method in such systems is emphasized. Types and variants of different kinds of probes application are described.

Yu. S. Popkov, E. A. Markov, M. V. Chernykh
Acoustic Emission Application Prospects within Corrosion Monitoring Systems for Oil Processing Enterprise Equipment

Experimental research of acoustic emission under the condition of carbon steel galvanic corrosion is presented. Quantitative correlation between corrosion speed, AE activity and ambient acidity level are discussed. Attention is also paid to possible spectral and correlative cluster analysis applications for separation of AE signals of different physical nature. Possibility of AE method application for corrosion monitoring systems are considered.

NDT World News

E. Yu. Nefedev.
30th Europian Conference on Acoustic Emission Testing

III-rd International Scientific and Technical Conference “Acoustic Emission. The Role of the Method in Complex Systems for Technical State Monitoring of Hazardous Industrial Facilities”

3rd North West Conference on NDT & TD

Abstracts

M. V. Rozina, T. Yu. Sharapova
Abstracts of the Articles Published in Other Sources

T. Yu. Sharapova
The Internet News

Ultrasonic Inspection

V. E. Chabanov, V. A. Zhukov
Features of Ultrasonic Testing with the Use of Electromagnetic Acoustic Transducers

The main problems arising at electromagnetic acoustic transducer (EMAT) construction and ways of their solutions are described. Theoretical apparatus is given for numerical experiments and comparison of different EMAT constructions. It is shown how electronic channel of EMAT excitation and reception as well as the coils used affect the spatial and time parameters of radiated and received ultrasonic signals.

N. N. Konovalov, N. V. Meleshko
Measurement of Faulty Penetration Actual Height in Unilateral Butt Welded Connections with the help of Ultrasonic Flaw Detectors with Antenna Arrays

Butt welded samples have been tested by ultrasonic flaw detector with antenna array and then opened; testing results are received. Specifics of signal acoustic image interpretation are specified. The method of measuring of faulty penetration height in butt welded connections based on distance between signals (focal spots amplitudes) is considered.

Eddy Current Inspection

V. N. Uchanin, A. V. Opanasenko
Eddy-current Flaw Detector VD3-81 “EDDYCON” Application for Defect Detection in Oil and Gas Equipment Threaded Joints

The technology for eddy current testing of oil and gas equipment threaded sections is presented in the article, particularly associated with drill pipes and piston compressors. The article shows constructions of special-purpose scanners and ECPs that, being a part of universal flaw detector VD3-81 «EDDYCON», provide thread testing with the detuning from interfering factors such as gap change and ECP skew.

Acoustic Inspection

O. V. Muravjeva, V. V. Muravjev, V. A. Strizhak, E. N. Kokorina, M. A. Loyferman
Spring Manufacturing. Real Sensitivity of Bar Workpiece Incoming Acoustic Inspection

Real sensitivity of nondestructive testing of bar workpieces for spring manufacturing was studied. Guided-wave acoustic and mirror-optical method on multireflections with electromagnetic-acoustical transformation was used. The results of the study are presented.

Optical Inspection

M. Laakkonen
Stress Measurements in Glass and Plastics by Optical Hole-Drilling

Quantitative residual stress depth profile measurements are common for metallic parts but not in glass or plastic. This article describes some experiments by hole-drilling with ESPI in two types of glasses and two thermoplastics.

Stress measurements on laminated and toughened glass specimens produced the expected results: low stresses in the former and significant compressive stresses near the surface in the latter for the as-is condition. Since the bending stresses change little within the comparatively small depth range, measurements under bending should and do show slightly higher tensile stresses within the whole depth range.

NDT in the Railways

M. V. Tarabrin
"TVEMA" Comes to the Railway of Germany

The factors influencing on technique of automated ultrasonic testing system structure and modules selection are considered for various objects. Examples of these systems development depending on inspected object parameters and customer requirements are resulted. It is shown that the developed systems were most efficiently applied for the operational inspection of high danger objects. Thus transition from the flaw detection to the flaw measurement with remaining life evaluation is provided.