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1
Content available Innovative Methods of Terahertz Diagnostics in Selected Key Military and Security Applications
Świderski Waldemar, Dragan Krzysztof, Mielnik Dariusz, Pałka Norbert
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
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2023
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Vol. 14, Nr 4 (54)
83--90
EN
The article presents the main research directions of the project implemented by the consortium under the National Defence and Security Program: "Development of modern, breakthrough technologies for state security and defence", codename "SZAFIR". During the implementation of the project, the possibilities of using terahertz radiation will be examined for diagnostic tests of components crucial for defence and security, such as solid rocket fuels, aramid fibre-based composites (bulletproof vests, helmets, pyrotechnic suits), and polymer composites reinforced with glass and carbon fibres (aircraft elements). As a result of research, the interaction of tetheric radiation with materials of these components will be analysed, followed by the development of a methodology for determining their defects. This will result in creating innovative dedicated stations for non-destructive testing of these components. Neural network-based advanced signal processing and artificial intelligence algorithms will be used for automatic diagnostics of key components, improve the process of their control and therefore increase the safety of people and military equipment.
PL
W artykule przedstawiono główne kierunki badawcze projektu TeraDiag realizowanego przez konsorcjum (WITU, IOE WAT, ITWL oraz LTT) w ramach programu NCBR na rzecz obronności i bezpieczeństwa państwa pn. "Rozwój nowoczesnych, przełomowych technologii służących bezpieczeństwu i obronności państwa” pk. "SZAFIR". W trakcie realizacji projektu zostaną zbadane możliwości zastosowania promieniowania terahercowego do badań diagnostycznych kluczowych dla obronności i bezpieczeństwa komponentów, takich jak stałe paliwa rakietowe, kompozyty na bazie włókien aramidowych (kamizelki kuloodporne, hełmy, kombinezony pirotechniczne), kompozyty polimerowe wzmacniane włóknami szklanymi i węglowymi (elementy statków powietrznych).W wyniku prac badawczych przeprowadzona będzie analiza oddziaływania promieniowania terahercowego anetz materiałami tych komponentów a następnie opracowana metodyka wyznaczania ich defektów. W rezultacie powstaną nowatorskie dedykowane co najmniej dwa stanowiska do badań nieniszczących tych komponentów. Zaawansowane algorytmy przetwarzania sygnałów i sztucznej inteligencji bazujące na sieciach neuronowych pozwolą na automatyczną diagnostykę kluczowych komponentów, przyczynią się do polepszenia procesu ich kontroli, a przez to poprawią bezpieczeństwo ludzi i sprzętu wojskowego.
2
Content available Application of Digital Radiography (Dr) in an Approach to Evaluate the Technical Condition of MiG-29’s Vertical Stabilizers
Luziński Rafał, Synaszko Piotr, Dragan Krzysztof
Fatigue of Aircraft Structures
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2021
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Iss. 13
1--7
EN
The purpose of the work presented was to evaluate the capabilities of digital radiography to detect cracks in the internal structure of MiG-29 vertical stabilizers. The test object was a stabilizer previously subjected to fatigue testing and partially torn down for the needs of visual inspection. An inspection of three regions containing cracked parts was performed, with use of a pulsed x-ray generator and digital detector array. The results confirmed the method could be used to detect cracks in an internal structure which could not be inspected with other methods without affecting the stabilizer’s integrity.
3
Content available Analysis of the Corrosion Resistance of Aircraft Structure Joints with Double-Sided Rivets and Single-Sided Rivets
Kamińska Paulina, Synaszko Piotr, Ciężak Patryk, Dragan Krzysztof
Fatigue of Aircraft Structures
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2020
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Iss. 12
57--68
EN
An important factor having a negative impact on the technical condition of aircraft structure elements is the adverse effect of the atmosphere, which causes formation of corrosion in aircraft structures, especially in riveted lap joints. The electric potential difference between the sheet material and the rivet, in the presence of humid air, may cause electrochemical corrosion. The paper presents specimens that imitate the repair on the Mi-24 helicopter with the use of blind rivets in places where solid double-sided rivets could not be used.The aim of the research was to assess the corrosion resistance of lap joints with the use of single-sided and double-sided rivets. The analysis of corrosion resistance was carried out based on accelerated aging tests in a salt spray chamber. The salt chamber tests were aimed at determining the changes taking place in the specimens exposed to the marine environment. In the course of periodic observations changes in the mass of the specimens and in the form of corrosion losses were recorded. These activities were aimed at determining whether the exposure of specimens in the salt chamber causes electrochemical corrosion or pillowing. In addition, the specimens were subjected to static strength tests to assess the effect of corrosion on the strength properties of riveted joints.
4
Content available remote Correlation between strength, hardness and the share of welding imperfections in an AW 5754 aluminium alloy weld executed with the TIG method
Woźny Piotr, Błachnio Józef, Dragan Krzysztof
Journal of KONBiN
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2019
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Vol. 49, iss. 4
383--400
EN
The article presents the impact of welding imperfections on the strength and microhardness of AW 5754 aluminium alloy welded joints executed with the TIG method. It presents the results of tomographic tests of welds. The results of strength and microhardness tests involving welds executed under various welding process parameters were shown. The impact of welding imperfections on the strength and microhardness of a welded joint was analysed. Based on analysing the relations between the r Pearson coefficient values and multiple correlation, significant relationships between strength, hardness and weld defects were evidenced. Furthermore, a very strong relation between the welding process parameters, welding imperfections, and weld strength and microhardness was shown.
PL
W artykule przedstawiono wpływ niezgodności spawalniczych na wytrzymałość i mikrotwardość połączeń spawanych ze stopu aluminium AW 5754 wykonanych metodą TIG. Zaprezentowano wyniki badań tomograficznych spawów, badań wytrzymałościowych oraz mikrotwardości spawów wykonanych przy różnych parametrach procesu spawania. Dokonano analizy wpływu niezgodności spawalniczych na wytrzymałość oraz mikrotwardość połączenia spawanego. Wykazano istotne zależności pomiędzy wytrzymałością, twardością a niezgodnościami w spawach. Ponadto wykazano silny związek pomiędzy parametrami procesu spawania, niezgodnościami spawalniczymi, wytrzymałością i mikrotwardością spawów.
5
Content available Mi-24 Helicopter Full Scale Fatigue Test Concept
Reymer Piotr, Zieliński Wojciech, Piątkowski Łukasz, Dziendzikowski Michał, Kurnyta Artur, Wrąbel Rafał, Cichocki Tomasz, Leśniczak Andrzej, Kurdelski Marcin, Dragan Krzysztof
Fatigue of Aircraft Structures
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2019
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Iss. 11
11--18
EN
This paper presents a general concept of the Full Scale Fatigue Test of the Mi-24 helicopter including the test layout and load distribution, as well as describes the milestones to be achieved. Additionally, some initial work conducted in order to determine both the mass and load distribution in the structure is described. The main goal of the test is to verify the low cycle fatigue life of the helicopter structure (fuselage, tail boom, wings and landing gear). The test will be divided into two main stages at which flight and landing loads will be applied. The authors demonstrate the general test concept, the helicopter’s structure fixture and the arrangement of the hydraulic actuators at both stages in order to achieve representative loads during the test. The proposed concept is based on AFIT’s previous experience in full scale structural testing, available literature and the experience of the test staff.
6
Content available Comparison of Pulse Thermography (PT) and Step Heating (SH) Thermography in Non-Destructive Testing of Unidirectional GFRP Composites
Kamińska Paulina, Ziemkiewicz Jarosław, Synaszko Piotr, Dragan Krzysztof
Fatigue of Aircraft Structures
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2019
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Iss. 11
87--102
EN
This paper presents two techniques of active thermography i.e. the pulsed thermography technique and the step heating technique. The aim of this article is to compare these two techniques and present the possibilities, advantages and limitations of their use in the context of non-destructive testing of composite materials. The experimental section presents the results of tests carried out on samples of the polymer composites reinforced with glass fiber.
7
Content available A Comparison of Composite Specimens Damage area Measurements Performed using Pulsed Thermography and Ultrasonic NDT Methods
Luziński Rafał, Ziemkiewicz Jarosław, Synaszko Piotr, Żyluk Andrzej, Dragan Krzysztof
Fatigue of Aircraft Structures
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2019
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Iss. 11
68--77
EN
Carbon fiber reinforced plastics (CFRPs) are widely used in aerospace structures due to their high stiffness, strength and good fatigue properties. They are however vulnerable to loads perpendicular to their plane and, while impacted, can suffer significant internal damage decreasing their overall strength. Detecting and sizing such damage is an important task of the non-destructive inspection (NDI) methods. This study was conducted to detect and quantify damage in a set of six impacted even rectangular CFRP specimens designed from a MiG-29 vertical stabilizer’s skin. The inspection was done using the ultrasonic (UT) method (based on mobile scanner – MAUS V) and the pulsed infrared thermographic (IRT) method. Each specimen’s inside and outside (impacted) surface was inspected separately with IRT, while the outside surface was then inspected with UT. UT provided the most precise measurements of the damage area, while the IRT inspection of the outside surface (which would be accessible on a real aircraft structure) provided underestimated values due to the damage’s depth and geometry.
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