Evaluation of Aluminium Alloys Degradation in Aging Aircraft

Ostash, О. P.; Uchanin, V.M.; Semenets, O. I.; Holovatyuk, Yuriy; Koval’chuk, L. B.; Derecha, Valeriy

doi:10.1080/09349847.2017.1302622

Cited by 15 publications

(12 citation statements)

References 13 publications

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“…An important condition of the stationary nature of running of PAW process is the optimum combination of the pulse and pause parameters [8,[12][13][14][15][16][17][18][19]. In view of the fact that the number of variable parameters at PAW is considerable, selection of their optimum combination is a quite labour-consuming process and it includes a large number of trials and errors [20].…”

Section: Scientific and Technicalmentioning

confidence: 99%

“…These areas were selected in the characteristic points of change of local values of metal specific electric conductivity (Figure 3, points a-f), which is the physical characteristic of aluminium alloys, sensitive to the change of their structure and local stress-strain state, occurring during welding [3]. Values of specific electric conductivity were measured, using the eddy current method, with 1 mm step at alternating current frequency of 100 kHz that ensured the control depth up to 2 mm [16].…”

Section: Industrialmentioning

confidence: 99%

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Effect of pulsed-arc welding modes on the change of weld metal and haz parameters of welded joints produced with Sv-08kh20N9G7T wire

Poznyakov¹,

Zavdoveev²,

Gajvoronsky³

et al. 2018

The Paton Welding J.

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Section: Scientific and Technicalmentioning

confidence: 99%

Section: Industrialmentioning

confidence: 99%

Effect of pulsed-arc welding modes on the change of weld metal and haz parameters of welded joints produced with Sv-08kh20N9G7T wire

Poznyakov¹,

Zavdoveev²,

Gajvoronsky³

et al. 2018

The Paton Welding J.

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“…The eddy current (EC) NDI method has long been widely applied to inspect structure and component fabricated from conductive materials to identify their structural integrity [4][5][6][7][8][9]. Since the 1950s the role of EC inspection has developed increasingly, especially in the aerospace and nuclear industries.…”

Section: Introductionmentioning

confidence: 99%

“…[6,7]. EC method is also applied for non-magnetic alloys heat-treatment verification and aluminum alloys degradation monitoring by the noncontact electrical conductivity measurements [7,8].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Eddy Current Techniques for Detection of Surface-Breaking Cracks in Aircraft Structures

Uchanin

2021

Transactions on Aerospace Research

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Well-timed detection of the defects (e.g., fatigue cracks and corrosive damages) in aircraft structures is the question of vital importance. Periodic in-service non-destructive inspection (NDI) is necessary to prevent expensive aircraft breakdowns during in-service life. Eddy current (EC) NDI method have many advantages for in-service aircraft inspection due to high mobility and the possibility to detect fatigue cracks without direct contact with the inspected surface (even through a protective coating without removal). Last decades some enhanced EC techniques were developed for aircraft in-service inspection in the Karpenko Physico-Mechanical Institute of National Academy of Sciences (Lviv) in collaboration with Ukrainian and foreign aircraft companies. Proposed earlier EC efficiency coefficient was applied for the selection of the ferrite-core EC probe parameters. Investigations concerned with the crack detectability for single-coil EC probes of different sizes were carried out to improve the inspection procedures. The sensitivity of the developed single-coil EC probe was experimentally investigated. The possibility to distinguish the signals associated with detected defect and lift-off was shown. The new inspection procedure was proposed for full suppression of the noise concerned with the rivet edge influence. The high-frequency EC flaw detector of Leotest VD 3.03 type based on self-generator mode and miniature single-coil EC probes application was developed for detection of the surface-breaking fatigue cracks. The original scheme of double-circuit self-generator with intermittent oscillations was invented and investigated. The pulse-repetition frequency of high-frequency oscillations was used as an informative parameter. The important feature of the developed self-generating scheme is the effective suppression of the lift-off influence (the changes of the clearance between the EC probe and the inspected object surface during the scanning). Developed EC flaw detectors of Leotest VD 3.03 type and inspection procedures were successfully implemented into the maintenance practice for detection of the fatigue cracks initiated in the wing and the fuselage structures and aviation engines in many companies such as ANTONOV AIRCRAFT, Lviv State Aircraft Repair Plant, Konotop aircraft repair plant «AVIAKON», Ukrainian International Airlines, MOTOR-SICH, State Enterprise “IVCHENKO-PROGRESS”, etc.

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“…The signals that can be represented by the model of narrowband processes are used for many NDT methods that are actively applied for the aviation materials testing, in particular, eddy current [1,2,3], ultrasonic [1,4], acoustic [1,5]. The informative characteristics are the signal envelope, frequency, phase, and signal spectra [6,7].…”

Section: Introductionmentioning

confidence: 99%

Advanced Signal Processing Methods for Inspection of Aircraft Structural Materials

Lysenko

Eremenko

Kuts

et al. 2020

Transactions on Aerospace Research

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Aircraft, their assemblies, and units must provide high durability and reliability, and maintain mechanical and technological characteristics throughout the life span of the aircraft. Different elements of aircraft structures work under mechanical loads, over a wide temperature range, with varying degrees of exposure to corrosive environments. Aircraft structural materials have a variation in the characteristics values and require the various testing methods for their inspection.In many NDT methods applied in aviation materials testing, signals that could be represented by a narrowband processes model are used. Known methods of their processing are focused on determining and analyzing the signals amplitude characteristics, but the information resource contained in phase characteristics is not used.In the article, the methodology for signal processing and determining phase characteristics in the time domain are discussed. It is based on the combination of the discrete Hilbert transform and the deterministic and statistical methods of the phase measurement. There are given examples of the application of the methodology for pulsed eddy current testing of electrically conductive materials and products, ultrasonic thickness measurement of products made of materials have significant ultrasonic attenuation, the realization impulse variant of acoustic impedance flaw detection of products made of composite materials. The examples have shown that the proposed signal processing methodology enables to determine new information parameters and signal characteristics for the industry, and extend the scope of known NDT methods.

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Evaluation of Aluminium Alloys Degradation in Aging Aircraft

Cited by 15 publications

References 13 publications

Effect of pulsed-arc welding modes on the change of weld metal and haz parameters of welded joints produced with Sv-08kh20N9G7T wire

Effect of pulsed-arc welding modes on the change of weld metal and haz parameters of welded joints produced with Sv-08kh20N9G7T wire

Enhanced Eddy Current Techniques for Detection of Surface-Breaking Cracks in Aircraft Structures

Advanced Signal Processing Methods for Inspection of Aircraft Structural Materials

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