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Wyświetlanie 1-10 z 265
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
Wyświetlanie 1-10 z 265

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