Wyniki wyszukiwania - Biblioteka Nauki

1

New Methodology of Testing the Stress Dependence of Magnetic Hysteresis loop of the L17HMF Heat Resistant Steel Casting

100%

Jackiewicz D. , Szewczyk R. , Bienkowski A. , Kachniarz M.

Journal of Automation Mobile Robotics and Intelligent Systems

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2015

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tom Vol. 9, No. 2

52--55

EN

This paper presents the results of investigation on the tensile stresses dependence of magnetic characteristics of the L17HMF steel casting. To ensure uniform stress distribution in the sample for this investigation and the closed magnetic circuit, the frame-shaped samples were used. This is very important because it provides results independent of the shape and dimensions of the sample. On the columns of the sample both sensing and magnetizing windings were made. It is highly recommended to wound magnetizing and sensing windings on both columns. Due to the specialized force reversing system, compressive force generates the uniform tensile stresses in the sample. Magnetic characteristics are measured under these stresses by digitally controlled hysteresis graph. On the base of results of measurements the magnetoelastic characteristics of L17HMF steel casting were determined. Determined this characteristic is necessary to developed nondestructive testing method for monitoring of industrial and energetic constructions with elements made by L17HMF steel casting.

2

Comparison of the CRLC models describing the Helmholtz type cells for the nondestructive photoacoustic spectroscopy

80%

Chrobak Ł. B. , Maliński M. A.

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2014

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tom Vol. 21, nr 3

545--552

EN

The photoacoustic cell is the heart of the nondestructive photoacoustic method. This article presents a new simple lumped-components CRLC model of the Helmholtz type photoacoustic cell. This model has been compared with the well known literature models describing the Helmholtz type cells for photoacoustic spectroscopy. Experimental amplitude and phase frequency data obtained for the two photoacoustic cells have been presented and interpreted in a series of models. Results of the fitting of theoretical curves, obtained in these models, to the experimental data have been shown and discussed.

3

Historia metod nieniszczących stosowanych w budownictwie polskim

80%

Runkiewicz L.

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2018

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tom nr 3

19--23

PL

W referacie przedstawiono rozwój metod nieniszczących na podstawie: • prac naukowo – badawczych w PAN, wyższych uczelniach oraz instytutach naukowo – badawczych; • konferencji naukowo – technicznych; • publikacji w postaci monografii, artykułów i referatów; • kursów i studiów podyplomowych. Przedstawiono także uczelnie, ośrodki naukowo – badawcze i profesorów mających znaczący wpływ na rozwój badań nieniszczących w polskim budownictwie. Podano również przegląd oraz podział metod i technik nieniszczących stosowanych obecnie w budownictwie do ocen konstrukcji żelbetowych, stalowych, drewnianych, murowych i z tworzyw sztucznych.

EN

The paper presents the development of nondestructive methods based on: scientific and research works at • the Polish Academy of Sciences, universities and research institutes; • scientific and technical conferences; • publications in the form of monographs, articles and lectures; • courses and post-graduate studies. Also presented are universities, research centers and professors having a significant influence on the development of nondestructive testing in Polish construction. A review and division of nondestructive methods and techniques currently used in construction to the appraisal of reinforced concrete, steel, wooden, masonry and plastic structures is also provided.

4

Study of a Compton backscattering wall defects detection device using the Monte Carlo method

80%

Qin X. , Yang J. , Du Z. , Xu J. , Li R. , Li H. , Liu Q.

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tom Vol. 68, No. 2

57--63

EN

In view of the shortcomings of traditional wall defect detection methods, such as small detection range, poor accuracy, non-portable device, and so on, a wall defects detection device based on Compton backscattering technology is designed by Monte Carlo method, which is mainly used to detect the size and location information of defects in concrete walls. It mainly consists of two parts, the source container and the detection system: first, through the simulation and analysis of the parameters such as the receiving angle of thebackscattered particles and the rear collimating material of the detector, the influence of the fluorescent X-ray peak of the detector collimating material on the backscattered particle counts is eliminated and the detected error is reduced; second, the ring array detector design, compared with single array detector and surface array detector, can facilitate real-time detection of defect orientation, expanding the single scan range and improving the detection efficiency. After simulation and comparative analysis, the relevant optimal parameters are obtained: the object is detected using a Cs-137 γ-ray source with an activity of 6 mCi, and a ring detector consisting of four 0.5-inch cube-shaped CsI scintillator detectors is placed at 150° to receive the backscattered photons. The simulation analysis using the Monte Carlo FLUKA program showed that the maximum depth of wall defect detection is 8 cm, the maximum error fl uctuation range of defect depth and thickness is ±1 cm, the overall device weight is <20 kg, and the measurement time is <5 min.

5

IR Thermography methods on nondestructive testing of ballistic covers made of multi - layer carbon fiber

80%

Hłosta P. , Świderski W. , Szudrowicz M.

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tom Vol. 20, No. 2

167--173

EN

Presently a lot of designs of light armours are based mainly on the multilayer composite materials. Thanks to these materials it was possible to achieve highest levels of ballistic resistance of specific armour at limited weight. The weight (area density) and the performance have direct influence on the value of combat ability of equipment and soldiers. Carbon fibers are basic types of reinforcement used in composites. They have many technical applications including light ballistic covers where they are mostly used as multi-layer composite materials constituting a structure made of several interconnected layers or many layers of carbon fibers, or in combination with other materials. Light ballistic covers have usually thickness of several to 10-20 mm and potential defects occurring in them have thermo-physical properties definitely different than materials they are made of so the non-destructive tests using thermography methods may be effective in detecting these defects. The main methods of active thermographic tests are as follows [1, 2]: - Pulsed Thermography – PT, - Step Heating Thermography – SHT, - Lock-in Thermography – LT, - Vibrothermography – VT. In the paper an application of Step Heating Thermography and Vibrothermography to detection of delaminating area of CFRP composites after mechanical impacts is presented.

6

The Infrared Thermography Applications in Material Engineering

80%

Koštial P. , Kopal I. , Mokryšová M. , Hajduchová L. , Klabník M. , Žiačik P.

Machine Dynamics Problems

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2004

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tom Vol. 28, No. 3

183-188

EN

This paper is a contribution into a wider discussion about nondestructive testing in material engineering. The aim of described research is the enhancement of experimental possibilities for subsurface defects detection in materials, products and structures by using an infrared scanning detector camera in real conditions of industrial practice. It was demonstrated that such type of high quality infrared imagers, supported by pulsed thermography with external thermal stimulation, powerful personal computer and several simple image-processing procedures, could serve as a useful tool for contactless detection of various types hidden flaws in different materials.

7

Identification of Lack of Fusion and Incomplete Penetration in Butt Weld Joint by Ultrasonic Phased Array Method and X-Ray Method

70%

Koňár R. , Mičian M. , Boháčik M. , Gucwa M.

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tom Vol. 64, iss. 3

1117--1124

EN

The main goal of the article is to identify artificially created defects like lack of fusion and incomplete penetration in buttweld joint using non-destructive volumetric methods. These defects are the most serious defects in welds of steel constructionsfrom the safety point of view. For identification, an ultrasonic phased array technique and a conventional X-ray using digital imaging were used. The theoretical part of the article describes the current state of the given issue and provides basic theoretical knowledge about ultrasonic and X-ray welding tests. In the experimental part, the procedure and results of testing butt weld joint are described by both non-destructive methods. The butt weld joint was made from steel S420MC. Each indication obtained by the ultrasonic and x-ray technique is supplemented by the macrostructure of the weld taken from the indication position. The results of the experimental work mentioned in the article point to the possibility and reliability of the identification of melting defects by selected nondestructive methods in terms of their character and orientation.

8

Advantages of the Total Focusing Method

60%

Reverdy F. , Benoist G.

Badania Nieniszczące i Diagnostyka

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2019

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tom nr 4

4--7

EN

Total Focusing Method has been recently made available in portable Phased-Array Ultrasonic Instrument. Portable industrial equipment with full-parallel capabilities allows handling of matrix-array probes, 3D imaging and advanced techniques for optimal focusing. Total Focusing Method, a reconstruction based technique, is discussed: it allows better sizing of the defects during inspections, a clear detection of small defects and defect characterization. Moreover, real-time adaptive inspection associated to Total Focusing Method has been implemented to take into account the variability of the examination surface.

PL

Metoda pełnego ogniskowania TFM (ang. Total Focusing Method) została niedawno udostępniona w przenośnym urządzeniu ultradźwiękowym z technologią phased-array. Przenośne urządzenia przemysłowe stwarzają możliwość nadzorowania równoległego pracy przetworników macierzowych, obrazowania 3D i zaawansowanych technik optymalnego ogniskowania. W pracy omówiono metodę TFM bazującą na technice rekonstrukcji. Pozwala ona na lepsze określenie rozmiarów wad podczas inspekcji, wyraźne wykrycie drobnych wad i ich charakterystykę. Ponadto przedstawiono wdrożenie kontroli adaptacyjnej w czasie rzeczywistym związanej z metodą TFM, uwzględniającej zmienność badanej powierzchni.

9

Wavelet Transform of Impulse Signals

60%

Batko W. , Mikulski A.

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tom Vol. 23, No. 2

139-146

EN

The paper deals with the application of wavelet transform to processing of impulse-type signals. This article analyses a number of impulse signal models. The mathematical description of these models has been taken from the Dirac delta function approximation. The authors have proposed use of certain conventional parameters that facilitate identification of the impulse composition of the processed signal. The application of wavelet transform to processing from magnetic tests of steel ropes is presented as well.

PL

Artykuł opisuje zastosowanie analizy falkowej w przetwarzaniu sygnałów typu impulsowego. Analizowano kilka typów modeli sygnałów, których opis matematyczny zaczerpnięty był ze znanych z teorii dystrybucji przybliżeń δ - funkcji Diraca. Do opisu wyników transformaty autorzy zaproponowali wprowadzenie pewnych umownych parametrów, które ułatwiają rozpoznanie impulsów w sygnale na tle innych składników np. funkcji okresowej. Pokazano zastosowanie transformaty falkowej do rozpoznania składnika skokowej zmiany przekroju metalicznego w sygnale z badań magnetycznych lin stalowych.

10

Zastosowanie badań dźwiękowych (sonic testing) do oceny jakości odlewów

60%

Białobrzeski A. , Orliński M. , Grochal T.

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tom R. 6, nr 18/2

337--342

PL

Metoda badań dźwiękowych (akustycznych) polega na pomiarze częstotliwości drgań własnych elementów (odlewów) lub na pomiarze czasu zaniku drgań po ich wzbudzeniu, czyli pomiarem zdolności tłumienia drgań. Uzyskana wartość pierwszej częstotliwości rezonansowej = częstotliwości drgań własnych, lub czasu tłumienia drgań badanego odlewu (elementu), jest porównywana z częstotliwością drgań własnych lub czasem tłumienia drgań odlewu (elementu) wzorcowego, spełniającego wszystkie wymagania wynikające z warunków technicznych odbioru (WTO).

EN

The method of sonic (acoustic) testing consists in measuring the frequency of free vibrations in elements (castings), or in measuring the time elapsing since the moment of exciting the vibrations till the moment of their fading, i.e. in measurement of the damping capacity. The obtained value of the first resonance frequency equal to the frequency of free vibrations or to the time required for damping of vibrations in the examined element (casting) is compared with the frequency of free vibrations or with the time of damping the vibrations in a reference element (casting), satisfying all the requirements dictated by the technical conditions of acceptance.

11

Inspection methods for quality control of fibre metal laminates in aerospace components

60%

Dragan K. , Bieniaś J. , Sałaciński M. , Synaszko P.

Kompozyty

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2011

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tom R. 11, nr 2

130-135

EN

Composite materials have been applied in aerospace structures in recent years. Presently, the new generation of structural composite materials for advanced aircraft are Fibre Metal Laminates (FML). They are hybrid composites consisting of alternating thin layers of metal sheets and fiber-reinforced composite material. FMLs have both low density and good mechanical properties (high damage tolerance: fatigue and impact characteristics, corrosion and fire resistance). The quality control of the materials and structures in aircraft is an important issue, also for FMLs. For FML parts, a 100% nondestructive inspection for the internal quality during the manufacturing process is required. In the case of FML composites, the most relevant defects that should be detected by non-destructive testing are porosity and delaminations. In this paper, the use of non-destructive different methods for the inspection of Fibre Metal Laminates were studied. The possibility of quality control of manufactured FML by means of defect detection procedures and processes are presented and discussed.

PL

Materiały kompozytowe, w szczególności w konstrukcjach lotniczych, odgrywają coraz większą rolę z uwagi na większe wartości wytrzymałości właściwej niż stopy aluminium, możliwość formowania dowolnych kształtów oraz odporność na przepalenia i korozję. Szczególnym typem konstrukcji kompozytowej o charakterze hybrydowym są tzw. włókniste laminaty metalowe (ang. Fibre Metal Laminates - FML). Wykonuje się je na bazie włókien szklanych, aramidowych z warstwami wytworzonymi z aluminium (np. GLARE - Glass ALuminum REinforced) lub tytanu. Laminaty FML są już stosowane m.in. w konstrukcji płatowca samolotu Airbus A-380. Pomimo szeregu zalet takich materiałów w trakcie wytwarzania lub eksploatacji mogą powstać wady produkcyjne lub uszkodzenia eksploatacyjne wpływające na trwałość konstrukcji, w której zostaną zastosowane. W artykule przedstawiono podejście do badań takich materiałów wykonanych z FML z wykorzystaniem badań nieniszczących metodami: ultradźwiękową i prądów wirowych. Ponadto pokazano wyniki badań z omówieniem konieczności wykonywania badań i zaletami/wadami poszczególnych metod.

12

Zastosowanie termowizji w badaniach nieniszczących i w mikroelektronice

60%

Więcek B. , Lis M. , Zwolenik S. , Danych R. , Wajman T.

Pomiary Automatyka Kontrola

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2002

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tom R. 48, nr 11

8-12

PL

W niniejszym artykule przedstawiono podstawowe zagadnienia jakimi zajmuje się Zespół Termografii Komputerowej Instytutu Elektroniki PŁ. Ponieważ zastosowania termowizji są bardzo ogromne i rosną, dlatego autorzy wybrali następujące zagadnienia, które są obecnie realizowane: projektowanie interfejsów do kamer termowizyjnych i integracja systemów, projektowanie radiatorów układów scalonych VLSI, wykorzystanie własności dynamicznych rur cieplnych w chłodzeniu układów elektronicznych. Przedstawione zostały również nowe zagadnienia, którymi zajmuje się zespół, takie jak badania nieniszczące z wykorzystaniem fali cieplnej jak również chłodzenie układów elektronicznych z wykorzystaniem pompy kapilarnej.

EN

In this article, an overview of thermography applications developed in the Institute of Electronics, Technical University of Lodz are presented. The growing interest of thermography in various field of applications is observed. In the domain of scientific investigations, thermography is successfully applied for modelling cooling systems in microelectronics, including phase change solutions. Additionally, dynamic thermography is widely used in non destructive testing in material science. Thermal wave method and pulse thermography are applied.

13

Rola badań nieniszczących w zapewnieniu bezpieczeństwa konstrukcji

60%

Kielczyk J.

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tom Nr 1

44--45

PL

Badania nieniszczące wykonywane są celem wykrycia niebezpiecznych nieciągłości i zalecenia ich likwidacji przed oddaniem konstrukcji do eksploatacji. Rygorystyczne wymagania stawiane są w normie ISO operatorom wykonującym badania. Zlecenie na badanie zawiera określony przez projektanta zakres badania i wymagania jakościowe, będące podstawą do doboru metody i techniki badania. Dla złączy spawanych do każdej metody badania istnieje norma badawcza i norma akceptująca. Organizowane są liczne, krajowe i międzynarodowe konferencje badań nieniszczących, na których referowane są najnowsze osiągnięcia i doświadczenia.

EN

The purpose of nondestructive testing is the detection of dangerous imperfections and recommendation to their removing before the structure is put into operation. Rigorous requirements are set-in ISO standard- to ndt operators. Every order on nondestructive testing includes defined by structure designer the scope of testing and quality requirements, which is the base to the selection of testing method. In case of welded joints examination and acceptation ISO standard is in use. Numerous country and international conferences are organized to present the newest achievements in the field of nondestructive testing.

14

Zastosowanie zjawiska modulacji absorpcji na nośnikach swobodnych do nieniszczących badań materiałów półprzewodnikowych

60%

Chrobak Ł. , Maliński M.

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tom Vol. 53, nr 12

110-113

PL

W pracy przedstawiono rozważania teoretyczne i wyniki eksperymentalne badań parametrów rekombinacyjnych materiałów krzemowych z wykorzystaniem techniki MFCA. Wykorzystana technika badawcza bazuje na zjawisku modulacji absorpcji na nośnikach swobodnych.

EN

This paper presents theoretical and experimental results of investigations of the recombination parameters of the silicon materials with the MFCA method. The applied technique is based on the phenomenon of the modulated free carriers absorption.

15

Wykrywanie wewnętrznych uszkodzeń w lekkich pancerzach kompozytowych metodami termografii w podczerwieni

60%

Świderski W. , Szabra D. , Szudrowicz M.

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tom R. 55, nr 11

906-908

PL

W artykule przedstawiono problematykę związaną z wykrywaniem podpowierzchniowych uszkodzeń powstałych w wyniku badań niszczących lekkich pancerzy kompozytowych stanowiących struktury wielowarstwowe wykonane z włókien aramidowych lub szklanych. Jako metodę nieniszczącą wykrywania strefy uszkodzenia zastosowano aktywną metodę termograficzną lock-in. Określenie wielkości strefy wewnętrznych uszkodzeń umożliwia porównywanie pancerzy wykonanych z różnych materiałów. Na podstawie przeprowadzonych badań stwierdzono, że strefa pod-powierzchniowych uszkodzeń materiału od strony uderzenia przez pocisk symulujący odłamek może być 3-krotnie większa od kalibru pocisku i 15 krotnie większa od strony przeciwnej dla lekkich pancerzy wykonanych na bazie włókna aramidowego lub szklanego.

EN

Light composite armour is a preferred solution against military and paramilitary sources of present threats as the reducing mass of battle vehicles provides a possibility of their quick air-transport. The light armours of these vehicles should be resistant against: common and rifle bullets, grenades, anti-personal mines, IED - improvised explosive devices. Recently, NATO countries have initiated an intensive investigation process to introduce modern composite materials into protection systems of armored vehicles and infantry fighting vehicles. The composites reinforced by fibres are used in structural elements of vehicle trunks. Materials of composite armours include graphite epoxy, glass epoxy and aramid fiber composites. The composites that have been examined can include a variety of defects, such as ballistic impacts, embedded defects, manufacturing defects, thermal damage, moisture ingress and other induced defects. Methods for testing ballistic protection of light armours are known and used. First of all, they consist of checking armours resistance against the bullets where the bullet velocity is known. Moreover, the V50 velocity is defined during the test. In this method the V50 velocity of a round or standard fragment is defined (according to STANAG 2920) as a velocity at which armour is penetrated with the probability of 50% (Fig. 2). The distribution of points hit by bullets or fragments on the surface of an armour is also important. In fact, only correct distribution of these points provides a guaranty for an impartial assessment of tested designs. After hitting by a bullet, shape and size of an area of damage in composite armours depends on the type and design of armour, so type of reinforcing material is particularly important. Knowledge of damage characteristics allows arranging the hitting points to avoid overlapping of damaged areas. Considering quality and protection ability of armour, the extent of internal damage should be kept in mind besides the direct ability to stop bullets and fragments. The Military Institute of Armament Technology in cooperation with the Military Institute of Armour & Automotive Technology carried out a project on using nondestructive testing method in order to evaluate destruction zones in light ballistic armour which appear as a result of impact of bullets and fragments. Nondestructive testing by using active IR thermography methods is very useful for evaluation of internal defects. In the paper there is presented the dependence between the energy of fragments/or bullets and the dimension of internal defects (Figs. 8 and 11).

16

Nondestructive Evaluation of Rubber Composites Using Terahertz Time Domain Spectroscopy

51%

Xu F. , Duan Mu Q. D. , Li L. J. , Yang D. , Xia B.

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tom Vol. 26, no. 1 (127)

67--72

EN

In recent years, with the progress of science, more and more detection methods are being used in various fields. However, the nondestructive testing of nonmetallic materials still needs further study. In this paper, an analysis of the time domain characteristics of rubber materials using terahertz detection technology was carried out, obtaining different defect rubber material spectral characteristics as well as imaging results and data. The results show that the THz spectrum imaging technique can detect the thickness of rubber material in the 0.1 ~ 4.0 terahertz band, and the image is clear and the resolution high. Meanwhile the time domain waveform obtained is sensitive to the debonding defects of the sample rubber, is suitable for judging the overall performance of the rubber inner defect detection, and can provide the scientific basis for rubber material performance.

PL

W artykule przedstawiono analizę charakterystyk materiałów gumowych z wykorzystaniem technologii wykrywania terahercowego, uzyskując różne charakterystyki spektralne defektów gumy, a także wyniki i dane obrazowe. Wyniki pokazały, że technika obrazowania widma THz może wykrywać grubość materiału gumowego w paśmie 0,1 ~ 4,0 terahercowym, a obraz jest wyraźny i ma wysoka rozdzielczość. W międzyczasie otrzymany przebieg domeny czasu jest wrażliwy na defekty badanej gumy, jest odpowiedni do oceny ogólnej wydajności wykrywania wewnętrznego defektu gumy i może zapewnić podstawy dla oceny właściwości materiału gumowego.

17

Ultrasonic methods for the tests of quality of casts from the alloys of aluminum

51%

Piekarczyk W. , Kata D. , Karwiński A.

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2011

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tom Vol. 11, iss. 3

87-92

EN

In this work we present the results of the check test of the properties of casts, made by the method of smelted models in the precise foundry THE ARMATURA in Lodz. Casts were made according to the new technological solution, worked out during the realization of the purposeful project. The determination of the technological parameters of the productive process, enabling making precise casts from the alloys of aluminum, made in ceramic forms about the ambient temperature was the effect of led works. The ultrasonic method was applied to the tests of proprieties received casts. The inhomogeneity of metal material and the influence of the temperature of form on the elastic proprieties of casts were investigated. Characteristic for casts values of the velocity of longitudinal and transversal ultrasonic waves were used also to calculate the materials constants: the Young modulus E, the shear modulus G and Poisson's coefficient [...]. The obtained values of the Young modulus for tested casts carried out from 70,5 GPa to 79,9 GPa. It was shown that ultrasonic tests in quick and nondestructive way allow on the examination of density and anisotropy of casts, and also can characterize of cast using their materials constants.

18

Wybrane problemy modelowania przewodzenia ciepła w badaniach nieniszczących materiałów kompozytowych

51%

Świderski W. , Vavilov V.

|

2012

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tom R. 41, z. 123

17--32

PL

W pracy przeprowadzono porównanie analitycznych i numerycznych metod stosowanych przy badaniu wymiany ciepła w materiałach kompozytowych, zawierających ukryte defekty typu naruszenia jednolitości (ciągłości). Poddano ocenie wykorzystywane oprogramowanie komputerowe oraz przedstawiono przewidywane kierunki rozwoju modeli badań termicznych.

EN

Analysis using analytical and numerical methods in investigation of exchange of heat in composite materials including hidden defects of disarrangement or uniformity (continuity) is carried out in the paper. The computer software used in this modeling is evaluated and future directions of development of thermal investigation models are presented too.

19

Advanced metrology of surface defects measurement for aluminum die casting

51%

Świłło S. J. , Myszka D.

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tom Vol. 11, iss. 3 spec.

227--230

EN

The scientific objective of the research is to develop a strategy to build computer based vision systems for inspection of surface defects in products, especially discontinuities which appear in castings after machining. In addition to the proposed vision inspection method the authors demonstrates the development of the advanced computer techniques based on the methods of scanning to measure topography of surface defect in offline process control. This method allow to identify a mechanism responsible for the formation of casting defects. Also, the method allow investigating if the, developed vision inspection system for identification of surface defects have been correctly implemented for an online inspection. Finally, in order to make casting samples with gas and shrinkage porosity defects type, the LGT gas meter was used . For this task a special camera for a semi-quantitative assessment of the gas content in aluminum alloy melts, using a Straube-Pfeiffer method was used. The results demonstrate that applied solution is excellent tool in preparing for various aluminum alloys the reference porosity samples, identified next by the computer inspection system.

20

Evaluation of the resistance of steel–concrete adhesive connection in reinforced concrete beams using guided wave propagation

51%

Zima B. , Kędra R.

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tom Vol. 20, no. 1

1--13

EN

The development of the nondestructive diagnostic methods is of significant importance in the last decades. A special attention is paid to diagnostics of reinforced concrete structures, which are very popular in the civil engineering field. A possible use of the guided waves in the estimation of the resistance of steel–concrete adhesive connection is studied in the following paper. The relationships relating adhesive connection resistance and wave propagation characteristics (wave velocity and the time of flight) have been derived and experimentally verified during pull-out tests conducted on a number of reinforced concrete beams varying in the debonding area. The pull-out tests were also monitored ultrasonically. On the basis of the results in the form of the time-domain signals, the theoretical load-carrying capacities of the pulled-out bars have been calculated and compared with the exact experimentally determined values. The high agreement of the results obtained proved the correctness of the developed method. Moreover, the signals registered during pull-out tests allowed to observe the changes of the wave velocity induced by the deterioration of the adhesive connection.