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Tytuł:
A Brief Review on NDT&E Methods For Structural Aircraft Components
Autorzy:
Wronkowicz-Katunin, A.
Powiązania:
https://bibliotekanauki.pl/articles/97992.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
NDT&E methods
non-destructive testing
non-destructive evaluation
aircraft structures
composite structures
Opis:
The paper presents a summary of non-destructive testing and evaluation (NDT&E) methods applied in inspections of structural aircraft components. This brief review covers the most commonly applied methods such as visual and penetrant inspections, tap-testing, eddy current inspections, shearography, thermography, acoustic emission testing, radiographic and tomographic inspections, and ultrasonic inspections. The general operating principles of these methods as well as their main advantages, limitations and application areas are described below.
Źródło:
Fatigue of Aircraft Structures; 2018, 10; 73-81
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contribution of acoustic emission into optimal bearing lubrication
Autorzy:
Ziegler, B.
Powiązania:
https://bibliotekanauki.pl/articles/242681.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
non-destructive testing
acoustic emission
Opis:
This article describes the bases of the acoustic emission analysis to make successful applications in the range of the tribological problems, especially at machinery slide journal bearings. Acoustic emission differs from ultrasonic testing, which actively probes the structure; Acoustic emission listens for emissions from active defects and is very sensitive to defect activity when a structure is loaded beyond its service load. During detecting and analysing the generated acoustic emission we earn information about the behaviour, state or quality of these acoustic emission sources. A lot of different sources are generating acoustic emission (e.g. corrosion processes, fluid friction, cracks, cutting processes). This paper shows the acoustic emission sources, the wave propagation, the mode conversion, the damping, the design of a typical transducer and the whole measurement chain. The piezoelectric disc, the "heart" of a typical acoustic emission transducer, converts the incoming mechanical wave into a corresponding electrical signal. Every transducer has its own characteristic, if this is unknown we can test it with difficult methods e.g. so called reciprocal method. On the end of this paper the signal parameters (burst-count, rise-time, signal-duration, signal peak amplitude, signal energy and root-mean-square) will be discussed.
Źródło:
Journal of KONES; 2007, 14, 4; 571-578
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On roughness measurement by angular speckle correlation
Autorzy:
Salazar, F.
Belenguer, T.
García, J.
Ramos, G.
Powiązania:
https://bibliotekanauki.pl/articles/220643.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roughness
speckle
non-destructive testing
Opis:
In this work, the influence of both characteristics of the lens and misalignment of the incident beams on roughness measurement is presented. To investigate how the focal length and diameter affect the degree of correlation between the speckle patterns, a set of experiments with different lenses is performed. On the other hand, the roughness when the beams separated by an amount are non-coincident at the same point on the sample is measured. To conclude the study, the uncertainty of the method is calculated.
Źródło:
Metrology and Measurement Systems; 2012, 19, 2; 373-380
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-destructive evaluation of sandwich plates by an ultrasonic IR thermographic method
Autorzy:
Świderski, W.
Hłosta, P.
Chuda-Kowalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/114699.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
non-destructive testing
IR thermography
sandwich panels
Opis:
The paper presents the possibility of using an ultrasonic IR thermographic method to detect internal defects in composite types of sandwich panels with metal sheets. Experimental results indicate that this method may in many cases be effective in detecting defects that weaken the structure of sandwich panels. The results also show the limitations of using this method to sandwich panels and the materials used in them.
Źródło:
Measurement Automation Monitoring; 2016, 62, 12; 406-410
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of very thin defects in CFRP by the lock-in thermography method
Autorzy:
Świderski, W.
Powiązania:
https://bibliotekanauki.pl/articles/247348.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
non-destructive testing
composite material
IR thermography
Opis:
Quick development of constructional composite materials application is caused by their excellent mechanical and strength-related properties, combined with a low specific weight. One of the basic groups of reinforcement materials in composites are carbon fibres discovered back in 19th century. The main reason of defects in structures of composite materials is the variability of working charges in constructions during the process of using. Existed defects are complicated because of the effects like loss of continuity of reinfused fibres, binder cracks and loss of fibres adhesiveness to binder. Diagnostic methods, which are effective with relation to metals became little effective when used in detection of defects in composite materials. This caused greater interest of diagnostic techniques with using infrared thermography. Lock-in thermography is one of NDT methods providing phase images of thermal waves in a sample leading to receiving a distribution of internal defects and allowing for thermal properties evaluation. We used lock-in thermography in connection with modulated thermal source synchronized with the IR image acquisition camera. It was prepared sample of multilayer structure carbon composite with deliberately introduced defects for comparative purposes. Very thin defects of different sizes and shapes made of Teflon or copper having a thickness of 0.1 mm were searches. The results are reported in the paper.
Źródło:
Journal of KONES; 2016, 23, 1; 385-390
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Accuracy of Damage Index Evaluation in Concrete Structures by Simultaneous Hardware Triggering
Autorzy:
Lamonaca, F.
Carrozzini, A.
Grimaldi, D.
Olivito, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/221422.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic emission
multi-triggering
non-destructive techniques
Opis:
Non-invasive damage monitoring of concrete structures by means of Acoustic Emission (AE) requires multitransducers, multi-channel acquisition, high sampling frequency and long observation time. Owing to its propagation in concrete, the signal from AE reduces its amplitude during the propagation, and, consequently, some events can be lost due to lower signal intensity than the trigger level set on one sensor only. The innovative proposal discussed in the paper consists in the introduction of a Flat Amplifier and Trigger generator block (FAT) in order to generate a logical trigger when the AE is detected by any transducer. Experimental tests confirm the effectiveness of the FAT to acquire all the AE events and to increase the evaluation accuracy of damage indexes.
Źródło:
Metrology and Measurement Systems; 2014, 21, 2; 341-350
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damage Detection and Size Quantification of FML with the Use of NDE
Autorzy:
Dragan, K.
Kornas, Ł.
Kosmatka, M.
Leski, A.
Sałaciński, M.
Synaszko, P.
Bieniaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/98012.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
fibre metal laminates
composites
non-destructive testing
Opis:
Composite materials have been developed in recent years. A new generation of structural composite materials for advanced aircraft is 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 weight and good mechanical properties (high damage tolerance: fatigue and impact characteristics, corrosion and fire resistance). Quality control of materials and structures in aircraft is an important issue, also for Fibre Metal Laminates. For FML parts, a 100% non-destructive inspection for 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, a number of different non-destructive methods for the inspection of Fibre Metal Laminates were studied. The possibility of quality control of manufactured FML laminates - detection of defects as well as the procedures and processes are presented and discussed.
Źródło:
Fatigue of Aircraft Structures; 2012, 4; 5-9
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ionising Radiation in Non-destructive Testing, Part 1 Types of Radiation used for Radiographic Testing – Basic Properties and Mechanism of Image Recording
Autorzy:
Ostromęcka, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/27311594.pdf
Data publikacji:
2023
Wydawca:
Instytut Kolejnictwa
Tematy:
ionising radiation
non-destructive testing
industrial radiography
Opis:
Electromagnetic radiation, which is a special example of the electromagnetic field, has been present in the universe since its creation. Examples of radiation include radio waves, X-rays, and visible light. Depending on the frequency of the emitted electromagnetic wave, it can be ionising or non-ionising. Ionising radiation, due to its ability to penetrate matter, is often used in many areas of life. In industry, it is used for diagnostic purposes, e.g. in radiography.
Źródło:
Problemy Kolejnictwa; 2023, 198; 141--146
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Guided waves in ship structural health monitoring – a feasibility study
Autorzy:
Roch, Emil
Zima, Beata
Woloszyk, Krzysztof
Garbatov, Yordan
Powiązania:
https://bibliotekanauki.pl/articles/32921251.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
corrosion
guided waves
non-destructive testing
ship structure
Opis:
Ships and offshore structures operate in a severe corrosion degradation environment and face difficulty in providing longlasting corrosion protection. The Classification Societies recommend regular thickness measurements leading to structural component replacements, to ensure structural integrity during service life. The measurements are usually performed using ultrasonic thickness gauges and such an approach requires multiple measurements of the corroded structural components. Otherwise, the collected data are insufficient to precisely assess the corrosion degradation level. This study aims to perform numerical and experimental analyses to verify the use of guided ultrasonic waves in defining the corrosion degradation level of the corroded structural components of a ship. The study incorporates the fundamental antisymmetric Lamb mode, excited by piezoelectric transducers attached at the pre-selected points on stiffened panels, representing typical structural ship components. The specimens are exposed to accelerated marine corrosion degradation, the influence of the degree of degradation on the wave time of flight being analysed. The study indicates that guided waves are a promising approach for diagnosing corroded structural components. The signals characterised by a high signal-to-noise ratio have been captured, even for relatively long distances between the transducers. This proves that the proposed approach can be suitable for monitoring more extensive areas of ship structures by employing a single measurement.
Źródło:
Polish Maritime Research; 2023, 2; 76-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Provenance study of Amerindian pottery figurines with Prompt Gamma Activation Analysis
Autorzy:
Kasztovszky, Z.
Mackowiak de Antczak, M.
Antczak, A.
Millan, B.
Bermúdez, J.
Sajo-Bohus, L.
Powiązania:
https://bibliotekanauki.pl/articles/147257.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
pre-Hispanic culture
pottery
non-destructive analysis
PGAA
Opis:
A Prompt Gamma Activation Analysis (PGAA) facility has been in operation at the Budapest Neutron Centre (BNC) since 1996. Nonetheless that PGAA is a relatively new method, its applicability to archeological research has already been established by several studies. Archaeologists of the Simón Bolívar University initiated a research project aimed to perform a provenance study of pre-Hispanic pottery figurines. Forty samples were selected from two archaeological sites excavated in the Los Roques Archipelago. Almost five hundred figurines have been recovered altogether in four sites of the Archipelago. Amerindian groups from the adjacent Venezuela mainland were identified as island sites' occupants, between A.D. 1200 and the European contact period. Forty fragments of figurines were investigated by PGAA, the concentrations of major- and some trace components being determined. Among others, K2O, Cl and Cr were found to be the most significant indicators of the samples originated from the Lake Valencia Basin (mainland) and from Los Roques Islands. By relating the island figurines to their stylistical and chemical counterparts from the mainland we will provide chronological information on hundreds of mainland figurines.
Źródło:
Nukleonika; 2004, 49, 3; 107-113
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of changes in the rotational speed of the shaft journal slide bearing on the acoustic emission signal
Autorzy:
Gesella, G.
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/241564.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
non-destructive testing
diagnostic
acoustic emission
slide bearing
Opis:
The paper presents preliminary studies of a slide bearing operation by using an acoustic emission. These studies were designed to test the usability of this method for the diagnosis and monitoring of bearings in marine drive system (in particular, stern tube bearing). This paper proposes a method of testing the operating status of the slide bearing using acoustic emission. It discusses the research station, where the study was conducted. The authors paid special attention to the impact of rotation speed of the shaft journal bearing sliding to change some parameters of the acoustic emission signal. The gathered results were analysed and it was evaluated how the rotational speed of the shaft journal affects the individual signal parameters of acoustic emission. Additionally, the sensitivity of the method was evaluated. The article describes: the basics of testing with using the acoustic emission, parameters of the acoustic signal (the acoustic emission burst count, arrival time, duration time, signal amplitude, signal energy and RMS) and the equipment necessary for measurements by using this method. This method, unlike the ultrasonic testing detects only the active wave source, and it is very sensitive to detect changes in the moment when the installation is operating under load. It proposes to use the acoustic emission method to study operational conditions of a slide bearing. Slide bearings are used in many constructions of mechanisms, machines and equipment. They are a strategic element of their design and their improper work leads to the machine damage in a very short period of time, which automatically excludes it from further exploitation. For this reason, the correct assessment of the technical condition of slide bearing and knowledge of the current operating conditions of the slide bearing are extremely important (particularly in the case of bearings in marine propulsion system).
Źródło:
Journal of KONES; 2016, 23, 2; 121-128
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Sensitivity Field of Dual Transducer Probes on Accuracy of Discontinuity Sizing and Evaluation in Terms of Testing of Forgings According to EN 10228-3
Autorzy:
Kaczmarek, R.
Kaczmarek, K.
Powiązania:
https://bibliotekanauki.pl/articles/352659.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non destructive testing
ultrasonic testing
double transducer probe
Opis:
The article presents results of research on the impact of sensitivity distribution of double transducer probes, which are often used in non-destructive ultrasonic testing of components such as forgings. Distribution of sensitivity measured in two orientations, parallel and perpendicular to the plane of separation of a double transducer probe has been tested and analyzed. A significant influence of orientation of a probe on echo envelope of an artificial point discontinuity has been studied. It has revealed great differences in length and shape of an echo envelope, depending on a type of probe and orientation of a probe separation plane to the moving direction. Eventually, the analysis of practical consequences of dual transducer probes usage for characterization of a type, dimensioning and evaluation of internal discontinuities, in accordance to the methodology specified in EN 10228, has been conducted.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1677-1682
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-destructive testing of ferromagnetic materials using hand inductive sensor
Autorzy:
Deyneka, R.
Tykhan, M.
Markina, O.
Powiązania:
https://bibliotekanauki.pl/articles/379344.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
non-destructive testing
hand inductive sensor
badania nieniszczące
Opis:
Purpose: The need for reliability of industrial structures, machines and other equipment requires more accurate testing of structural materials, especially ferromagnetic materials. Therefore, it is important to improve existing or develop new, more accurate methods and devices for non-destructive testing. Design/methodology/approach: Non-destructive testing of ferromagnetic materials is carried out by surveying a local magnetic field or determining the section magnetic resistance of a material using the proposed new type of sensor as the hand inductive element on a toroidal core with additional magnetic cores. Findings: This sensor has a simple design and high response characteristic, which has been confirmed experimentally. Such a sensor can be used for testing welded joints by the proposed method, which is based on measuring the magnetic resistance of the welding area. Research limitations/implications: Analytical physical processes research that occurred in the magnetic core material of the sensor coil core, used as a sensitive element, is complicated by the nonlinearity of the magnetization curve of the material of the core of the sensitive element and the lack of a single analytical relationship to fully describe the magnetization process of ferromagnetic materials of inductive elements. Therefore, each copy of the sensor will be an individual graduation. Practical implications: The proposed version of the hand inductive sensor allows to perform non-destructive testing during the operation of ferromagnetic structures and without special requirements to external conditions with low costs and the possibility of computer processing of data. Originality/value: The use of the nonlinearity zone of the magnetization curve of the inductive element core material made it possible to obtain a variant of a magnetic sensor that is close in sensitivity to fluxgate and, at the same time, is much simpler in design using non-deficient materials. The use of a ferrite core with low saturation induction requires a small circuit supply voltage, but a generator power reserve. The proposed hand inductive sensor is sensitive to the presence of extraneous ferromagnetic objects, and responds only to a magnetic field. The high magnetic resistance of the inductive sensor allows it to be used on uneven and dirty surfaces. High sensitivity allows to detect small deviations of the magnetic fields of dispersion of a welded joint with their comparison along the entire joint length. All of this gave new opportunities for more accurate non-destructive testing of structural elements and materials.
Źródło:
Archives of Materials Science and Engineering; 2019, 98, 1; 32-41
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-destructive characterisation of mortars reinforced with various fibres exposed to high temperature
Autorzy:
Ezziane, M.
Molez, L.
Messaoudene, I.
Powiązania:
https://bibliotekanauki.pl/articles/89226.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
mortars
steel fiber
polypropylene fibre
temperature
non-destructive test
Opis:
The objective of this study is to investigate the effect of temperature on the physical and mechanical properties of standard mortar reinforced with steel fibers, polypropylene fibers and hybrid fibers. Non-destructive tests (capillary water absorption, interconnected porosity, gas permeability, ultrasound celerity) were carried out on samples that had been heated, at a temperature ramp of 5 °C/min, to maximum temperature of: 105 °C, 400 °C, 500 °C et 800 °C. The results show a good correlation between the evolution of properties and the damage resulting from the imposed heat exposure treatment. The study shows that there is a significant deterioration of physico-mechanical properties of the fiber mortars above 500 °C. The hybrid fiber mortars show a good compromise: the polypropylene fibers guarantee a thermal stability whereas the steel fibers act to conserve good mechanical behavior.
Źródło:
Mining Science; 2018, 25; 179-194
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Główne kierunki prac naukowo-badawczych z zastosowaniem termografii w podczerwieni prowadzonych w WITU
General directions of scientific and research work on ir thermography made in miat
Autorzy:
Świderski, W.
Powiązania:
https://bibliotekanauki.pl/articles/234892.pdf
Data publikacji:
2011
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
badania nieniszczące
metody termograficzne
non-destructive testing
thermographic method
Opis:
W artykule zaprezentowano przykłady naukowo-badawczych prac realizowanych w WITU, w których stosowany były metody termografii w podczerwieni. Zaletą tych metod jest ich nieinwazyjność, wysoka efektywność, bezkontaktowy i uniwersalny charakter. Przedstawione wyniki wykazały przydatność oraz szerokie możliwość stosowania tych metod w aplikacjach militarnych.
The examples of scientific-research work realized in MIAT with the application of IR thermography methods are present in this paper. A nondestructive, high efficient, non-contact and universal character is a great advantage of these methods. Presented results show usefulness and wide possibility of using these methods in military applications.
Źródło:
Problemy Techniki Uzbrojenia; 2011, R. 40, z. 117; 17-27
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new diagnosing method of the internal structure of the titanium fan of a jet engine with laser ultrasonics
Autorzy:
Swornowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/221783.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non-destructive testing (NDT)
laser ultrasonic
titanium fan
aerospace
Opis:
Advanced metallic material processes (titanium) are used or developed for the production of heavily loaded flying components (in fan blade construction). The article presents one process for diagnosing the blade interior by means of laser ultrasonography. The inspection of these parts, which are mainly made of titanium, requires the determination of the percentage of bonded grain sizes from around 10 to 30 žm. This is primarily due to the advantages of a high signal-to-noise ratio and good detection sensitivity. The results of the research into the internal blade structure are attached.
Źródło:
Metrology and Measurement Systems; 2011, 18, 3; 441-451
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic emission as friction force indicator after test stands experiments
Autorzy:
Ziegler, B.
Miszczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/242687.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
non-destructive testing
acoustic emission
plain bearing
friction force
Opis:
This paper describes the use of acoustic emission measurement as an indicator of friction force into hydrodynamic journal bearings. The parameters load, speed, friction force, oil-temperature as well as the displacement of the sleeve are mainly measured in mutual dependence in journal plain bearing test stands. The friction force can not be measured directly, it must be calculated from the reaction force of the sleeve. Many different constructions are in use with the aim to load the bearing with a minimized influence of friction force measurement. Because of the huge influence to the friction force it is desirable to have parameters that are corresponding with it and are independent of the bearing load. We investigate the applicability of the acoustic emission analysis to indicate the friction force at an existing plain bearing test stand. The adoption of the acoustic emission measurement system (the diversion of the waves from the sleeve, the wave propagation through the AE transducer, the measurement chain and the damping of the mechanical and electrical disturbance) onto the test stand is described.
Źródło:
Journal of KONES; 2007, 14, 4; 579-586
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of residual stress fields in the riveted joint
Autorzy:
Szymczyk, E.
Jachimowicz, J.
Derewońko, A.
Powiązania:
https://bibliotekanauki.pl/articles/243089.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
riveted joint
FEM local model
non-destructive testing methods
Opis:
The riveted joints are critical areas of the aircraft structure. The residual stress and strain state appears at the rivet hole after the riveting process and improves fatigue behaviour of the joint. Numerical FE simulations of the upsetting process are carried out using the MARC code. Three-dimensional numerical models are used to determine the resulting stress and strain fields at the countersunk rivet and around the hole. The contact with friction is defined between the mating parts of the joint. Calculations are carried out in an elastic-plastic range. The influence of the rivet geometry, rivet stiffness and the sheet material model on strain and stress states is studied. Non-destructive testing methods like X-ray diffraction, liquid penetrant inspection and visual detection analysis with a UV lamp are used for validation of numerical results. Comparison between numerical and experimental results gives a satisfactory agreement. Numerical simulations allow investigating the influence of imperfections on the strength of the joint.
Źródło:
Journal of KONES; 2007, 14, 2; 465-473
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of image analysis methods on the example of ultrasonic thermography of an aramid composite
Autorzy:
Świderski, Waldemar
Powiązania:
https://bibliotekanauki.pl/articles/244857.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
non-destructive testing
composite material
IR thermography
image analysis
Opis:
Infrared thermography using ultrasound thermal excitation of the tested material is one of the most effective methods in non-destructive testing of a multi-layer aramid composite. This type of material is very popular in the construction of light ballistic armours. Typical defects are delamination between layers of aramid fabric joined by resin. They are usually filled with air. Delamination located deep under the surface of the test generates very weak temperature signals. They are often at the level of noise. To reduce the impact of noise on the detection of a defect, special methods of image analysis (thermograms) are used. Such methods include principal component analysis and wavelet analysis. Principal Component Analysis is a relatively new procedure of statistical data treatment, which is becoming increasingly popular in non-destructive testing. Mathematically, it is often regarded as implementation of the so-called singular values decomposition technique, which allows extracting of spatial information from a matrix of source data. The wavelet analysis is an integral transform, which represents the convolution of an analysed process with a special mother function called wavelet. Wavelets are characterized by two parameters: scale and shift. The paper presents a comparison of the efficacy of these methods in the detection of defects in the multilayer composite reinforced aramid fibre.
Źródło:
Journal of KONES; 2019, 26, 2; 145-150
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przykłady zastosowania metody tomografii ultradźwiękowej w badaniach wtrąceń w elementach betonowych
Examples of application of ultrasonic tomography method in concrete included in concrete elements
Autorzy:
Krawczyk, Ewa
Schabowicz, Krzysztof
Sterniuk, Adam
Powiązania:
https://bibliotekanauki.pl/articles/107750.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
ultrasound tomography
non-destructive testing
tomografia ultradźwiękowa
badania nieniszczące
Opis:
This paper presents modern non-destructive methods used to study concrete and reinforced concrete elements. Non-Destructive Testing allow for non-invasive assessment of the condition of the examined element. In addition to estimating the strength parameters, material properties, they also enable the detection of possible discontinuities and hidden wattles, as well as inclusions, e.g. improperly spaced reinforcing bars. Attention was paid to the ease of testing, the economics of the solution, and the advantages and limitations associated with the choice of non-destructive method. The most widely described method is ultrasonic tomography. An experiment was carried out consisting of measuring three samples of different geometry and different reflectors. The aim of the study was to determine the location and identification of inclusions, reflectors, air voids and discontinuities located in the samples.
W artykule przedstawiono wykorzystanie współczesnych metod nieniszczących stosowanych do badania elementów betonowych i żelbetowych. Badania NDT (ang. Non-Destructive Testing) pozwalają na bezinwazyjne ocenienie stanu badanego elementu. Poza szacowaniem parametrów wytrzymałościowych, właściwości materiałowych, umożliwiają także detekcję ewentualnych nieciągłości i ukrytych wad, a także wtrąceń, np. niewłaściwie rozmieszczonych prętów zbrojeniowych. Zwrócono uwagę na łatwość wykonania badań, ekonomikę danego rozwiązania oraz zalety i ograniczenia związane z wyborem metody nieniszczącej. Najszerzej opisano metodę tomografii ultradźwiękowej. Na tej podstawie przeprowadzono eksperyment polegający na pomiarze trzech próbek o różnej geometrii i różnych reflektorach. Celem przeprowadzanego badania było ustalenie lokalizacji oraz identyfikacja wtrąceń, reflektorów, pustek powietrza i nieciągłości zlokalizowanych w próbkach.
Źródło:
Badania Nieniszczące i Diagnostyka; 2019, 3; 15-19
2451-4462
2543-7755
Pojawia się w:
Badania Nieniszczące i Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of material defects using active thermography and an artificial neural network
Autorzy:
Dudzik, S.
Powiązania:
https://bibliotekanauki.pl/articles/221055.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active thermography
non-destructive testing
defect characterization
neural networks
Opis:
In the paper a method using active thermography and a neural algorithm for material defect characterization is presented. Experimental investigations are conducted with the stepped heating method, so-called time-resolved infrared radiometry, for the test specimen made of a material with low thermal diffusivity. The results of the experimental investigations were used in simulations of artificial neural networks. Simulations are performed for three datasets representing three stages of the heating process occurring in the investigated sample. In this work, the simulation research aimed to determine the accuracy of defect depth estimation with the use of the mentioned algorithm is descibed.
Źródło:
Metrology and Measurement Systems; 2013, 20, 3; 491-500
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion of Steel in Concrete - Modeling of Electrochemical Potential Measurement in 3D Geometry
Autorzy:
Filipek, R.
Szyszkiewicz-Warzecha, K.
Szczudło, J.
Powiązania:
https://bibliotekanauki.pl/articles/352732.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reinforced concrete corrosion
3D modeling
non-destructive testing
Opis:
The paper presents a 3D model and simulations of corroding reinforcement bars in a concrete element. Electric potential distributions are calculated in the concrete matrix and on its surface for two rebars arrangements with one or three active (anodic) sites to assess the reliability and identify possible problems when standard test measurements for corrosion assessment in concrete structures are used and conclusion on the corrosion state is inferred. The values of the potential strongly depend on a concrete layer thickness and beyond the threshold of 5-7 cm it is hardly possible to detect the number of active sites on the rebar. Also conductiv-ity – which is not constant in real world constructions – is an important factor. Thus without estimation of the state of concrete it is difficult to draw reliable conclusions on the corroding activity from shear potential measurements on the surface.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 117-124
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast, non-destructive measurement of roof-bolt loads
Autorzy:
Skrzypkowski, Krzysztof
Korzeniowski, Waldemar
Zagórski, Krzysztof
Dominik, Ireneusz
Lalik, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/178690.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
expansion-shell bolt
monitoring
non-destructive method
laboratory tests
Opis:
This paper discusses the pull-out laboratory tests and the monitoring of expansion-shell bolts with a length of 1.82 m. The bolts comprised the KE-3W expansion shell, a rod with a diameter of 0.0183 m and a profiled, circular plate with a diameter of 0.14 m, and a gauge of 0.006 m. The bolts were installed in a concrete block with a compressive strength of 75 MPa. The tests were conducted on a state-of-the-art test stand owned by the Department of Underground Mining of the AGH University of Science and Technology. The test stand can be used to test roof bolts on a geometric scale of 1:1 under static and rapidly varying loads. Also, the stand is suitable for testing rods measuring 5.5 m in length. The stand has a special feature of providing the ongoing monitoring of bolt load, displacement and deformation. The primary aim of the study was to compare the results recorded by two different measurement systems with the innovative Self-Excited Acoustic System (SAS) for measuring stress variations in roof bolts. In order to use the SAS, a special handle equipped with an accelerometer and exciter mounted to the nut or the upset end of the rod was designed at the Faculties of Mining and Geoengineering and Mechanical Engineering and Robotics of the AGH University of Science and Technology. The SAS can be used for non-destructive evaluation of performance of bolts around mining workings and in tunnels. Through laboratory calibration tests, roof bolt loads can be assessed using the in-situ non-destructive method.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 2; 93-101
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ionising Radiation in Non-Destructive Testing. Part 2 – Selected Issues Related to the Implementation of Radiographic Testing for the Diagnosis of Rail Joints on PKP PLK S.A. Infrastructure
Autorzy:
Ostromęcka, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/28328218.pdf
Data publikacji:
2023
Wydawca:
Instytut Kolejnictwa
Tematy:
non-destructive testing
industrial radiography
welded joint
rail joints
Opis:
The article presents the main issues and challenges associated with the implementation of radiographic testing for the diagnosis of rail joints conducted in field conditions on the infrastructure of PKP PLK. It outlines the range of guidelines that need to be created or modified in relation to the necessity of using ionising radiation, and identifies possible areas for reducing the time taken to perform the tests.
Źródło:
Problemy Kolejnictwa; 2023, 199; 87--95
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostyka eksploatacyjna stali w energetyce
Operating diagnostics of steels in power engineering
Autorzy:
Żurek, Z. H.
Dobmann, G.
Rockstroh, B.
Kukla, D.
Powiązania:
https://bibliotekanauki.pl/articles/1201836.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
badania nieniszczące NDT
badania nieniszczące NDE
detekcja zmęczenia
prądy wirowe
non-destructive testing (NDT)
non-destructive examination NDE
fatigue detection
eddy currents
Opis:
The martensitic steel P91 belongs to the group of steels used in power engineering. Machine components and equipment using steels from the group (K18 - P 265 and 13 HMF) are utilized in service at increased temperatures. Such steels are exposed to thermal fatigue loads, accelerated corrosion, dynamic creep and relaxation due to fatigue processes. The harsh operation conditions (temperature, pressure) have a diverse influence on the evolution process of their physical parameters. In case of most of the steels used in power industry the magneto-inductive measurement of physical properties is a convenient technique for testing of samples, even for continuous diagnostics of installation sector. The paper presents results of tests performed on P91, P265 and 13 HMF steel samples, and a low cost service life monitoring is proposed.
Stal martenzytyczna P91 należy do grupy stali stosowanych w energetyce. Komponenty maszyn i wyposażenie wykorzystujące stale z tej grupy (K18 - P 265 i 13 HMF) są użytkowane w eksploatacji przy podwyższonych temperaturach. Stale te są narażone na obciążenia zmęczeniowe cieplne, przyspieszoną korozję, pełzanie dynamiczne i relaksację powodowane procesami zmęczeniowymi. Trudne warunki eksploatacji (temperatura, ciśnienie) wywierają różny wpływ na proces zmian ich parametrów fizycznych. W przypadku większości stali stosowanych w energetyce, magneto-indukcyjny pomiar właściwości fizycznych jest dogodną techniką badania próbek, a nawet przy ciągłym diagnozowaniu wycinka instalacji. Artykuł prezentuje wyniki badań przeprowadzonych dla próbek stalowych P91, P265 i 13 HMF oraz proponuje niskokosztowe rozwiązanie monitoringu eksploatacyjnego.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2016, 1, 109; 169-176
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 265

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