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Wyświetlanie 1-9 z 9
Tytuł:
The Plastic Deformation of RFSSW Joints During Tensile Tests
Deformacja plastyczna wybranych połączeń RFSSW podczas rozciągania
Autorzy:
Lacki, P.
Derlatka, A.
Powiązania:
https://bibliotekanauki.pl/articles/353202.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plastic deformation
RFSSW joints
tensile test
deformacja plastyczna
połączenia RFSSW
rozciąganie
Opis:
The dynamic development of the friction stir welding (FSW) technology is the basis for the design of durabe joints inter alia in the aviation industry. This technology has a prospective application, especially for the aluminum alloys. It is suitable for a broad spectrum of permanent joints. The joints obtained by FSW technology are characterized by good mechanical properties. In this paper, the friction stir spot welding joints were analysed. The example of a structure made using this technology were presented. The lap joints made of 2mm Al 6061-T6 sheets were the investigation subject. The different spot welds arrangements were analysed. The tensile test were performed with optical deformation measurement system, which allow to obtain the plastic deformation field on the sample surface. The plastic strain graphs for the characteristic line passing through the maximum deformation were registered and presented. The experimental results were compared to the FEM numerical analysis. The numerical models were built with 3D-solid elements. The boundary conditions, material properties and geometry of the joints were identical as during experimental investigation. The mechanism of deformation of welded joints during tensile test was described and explained. It has been found that the arrangement of the spot welds with respect to the tensile direction has an important influence on the behaviour and deformation of lap joint.
Dynamiczny rozwój technologii zgrzewania tarciowego z mieszaniem (FSW) jest podstawą do projektowania wytrzymałych połączeń między innymi w przemyśle lotniczym. Technologia ta, szczególnie dla stopów aluminium, ma perspektywiczne zastosowanie. Nadaje się do wykonywania szerokiego spektrum połączeń nierozłącznych. Połączenia uzyskane przy użyciu tej technologii cechują się dobrymi właściwościami mechanicznymi i użytkowymi. W pracy analizowano połączenia uzyskane przy użyciu technologii punktowego zgrzewania tarciowego z mieszaniem (RFSSW). Zaprezentowano przykład elementu konstrukcji wykonanej przy użyciu tej technologii. Przedmiotem badań w pracy były połączenia zakładkowe wykonane z 2mm blachy Al 6061-T6. Połączenia zgrzewane różniły się ułożeniem zgrzein punktowych. Próbki rozciągano na maszynie wytrzymałościowej, jednocześnie dokonując pomiaru przy użyciu optycznego systemu pomiaru deformacji. Przy użyciu tego systemu uzyskano pole odkształceń plastycznych na powierzchni rozciąganej próbki. Zarejestrowano i przedstawiono wykresy odkształceń plastycznych dla charakterystycznych linii przechodzących przez maksimum odkształcenia. Wyniki badań doświadczalnych odniesiono do przeprowadzonej analizy numerycznej MES. Model numeryczny zbudowano z elementów typu 3D solid. W modelu odwzorowano warunki brzegowe przeprowadzonej próby, właściwości materiału i geometrię złącza. Opisano i wyjaśniono mechanizm deformacji złącz zgrzewanych podczas rozciągania. Stwierdzono, że położenie zgrzein w stosunku do kierunku rozciągania ma istotny wpływ na pracę i deformację połączenia zakładkowego.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 4; 2585-2592
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Tool Geometry for Refill Friction Stir Spot Welding (RFSSW) on Weld Properties During Joining Thin Sheets of Aluminum Alloys
Autorzy:
Łogin, W.
Śliwa, R. E.
Ostrowski, R.
Andres, J.
Powiązania:
https://bibliotekanauki.pl/articles/354218.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
RFSSW
joint strength
material softening
RFSSW tools
Opis:
The paper presents the results of research on the modification of the face geometry of the refill friction stir spot welding tool sleeve for welding thin aluminum sheets with an Alclad and an oxide anode coating. The analysis of the impact of such modification on the process perform (tool motion parameters, temperature) and microstructure as well as mechanical strength of the lap joints were analyzed. The tests were carried out using aluminum alloy 2024-T3 sheets with thickness 1.27 mm. For comparative purposes,joints were also made using plates without an Alclad and without anodized coating with using unmodified tool and modified toolswith developed 3 variants of face geometry. The samples with the joint were subjected to metallographic and strength tests. It has been shown that the use of modified geometry has a decisive influence on the performance of the process and the effect of softening and mixing of materials in the zone of point connection.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 975-981
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Modification of the Front Surface Geometry of the RFSSW Tool Sleeve on the Plasticization Effect and Stirring Materials During Joining Sheets Made of Aluminum Alloy 2024
Autorzy:
Łogin, Waldemar
Śliwa, Romana E.
Ostrowski, Robert
Powiązania:
https://bibliotekanauki.pl/articles/2174597.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
RFSSW
RFSSW tools
joint strength
material mixing
Opis:
The paper presents the results of research and analysis of the effect of joining by the RFSSW method of alclad sheets made of Al2024 with an anodic oxide coating, with the using the tool with modified geometry of the front surface of inner sleeve. The different effects of the modifications made on the phenomenon of plasticization and stirring of materials in the process of creating a weld, microstructure of welds and mechanical strength of lap joints were shown. The tests were carried out on 1.27 mm thick sheets, with the use of an unmodified tool and modified tools with three variants of the geometry. The welds and the joints samples were subjected to metallographic and strength tests. It has been shown that the use of a properly selected modified geometry has a beneficial effect on the transport of materials to be joined in the joint zone (flow pattern of plasticized layers and the stirring effect) during the welding, which translates into the strength of the joints and the nature of the weld failure.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1435--1442
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Research of the Weakening of the Fuselage Skin by RFSSW Single Row Joints
Autorzy:
Kubit, Andrzej
Bucior, Magdalena
Kluz, Rafał
Bochnowski, Wojciech
Perłowski, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/102400.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
RFSSW
welding
thin-walled structures
pressurization
microstructure analysis
spawanie
struktury cienkościenne
zwiększanie ciśnienia
analiza mikrostruktury
Opis:
The paper presents the results of experimental investigations, the aim of which was to determine the degree of weakening of skin sheet of the thin-walled structure through a single-row welded joints made by Refill Friction Stir Spot Welding (RFSSW) technology. At the beginning, a short metallographic analysis of the weld was carried out, defining the characteristic areas of the microstructure. Then, comparative tests were carried out on the thin-walled structure sample in the form of a single-row skin-stringer joint. The structures made with the discussed technology of welding were compared with the traditionally joined structure by riveting. It has been shown that in the case of the welded structure, the skin sheet is weakened by more than 6% to a lesser extent than in the case of riveted. However, it was shown that the cracking path in the tensiled welded sheet runs along an unpredictable path, deviating from the line marked by the welds’ row. While in the case of riveted joint the cracking propagation along the row of rivets was revealed. The analyzes of fracture surfaces for both cases using scanning electron microscopy were also undertaken, thus undertaking preliminary considerations on the mechanism of fracture.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 3; 90-97
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and Numerical Stress State Assesment in Refill Friction Stir Spot Welding Joints
Autorzy:
Gadalińska, Elżbieta
Kubit, Andrzej
Trzepieciński, Tomasz
Moneta, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2105194.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
RFSSW
X-ray diffraction
finite elements modelling
stress state
aluminium alloys
Opis:
Refill Friction Stir Spot Welding (RFSSW) is a technology used for joining solid materials that was developed in Germany in 2002 by GKSS-GmbH as a variant of the conventional friction stir spot welding (FSSW) [1]. In the RFSSW technology, the welding tool consists of a fixed outer part and rotating inner parts, which are called a pin and a sleeve. The tool for RFSSW is designed to plasticize the material of the parts to be joined by means of a rotary movement. The design of the tool allows independent vertical movement of both elements of the welding tool. This allows obtaining spot welds without creating holes that could weaken the structure. The main advantage of RFSSW is the potential for replacing the technologies that add weight to the structure or create discontinuities, such as joining with screws or rivets. Thus, RFSSW has great potential in the automotive, shipbuilding and aviation industries. Furthermore, the technology can be used to join different materials that could not be connected using other joining methods. The main objective of this work is to understand the physical and mechanical aspects of the RFSSW method - including the residual stress state inside the weld and around the joint. The results of the investigations can help to determine optimal parameters that could increase the strength and fatigue performance of the joint and to prove the significant advantage of RFSSW connections over other types of joints. The work assumes the correlation of two mutually complementary investigation methods: numerical analyses and experimental studies carried out with diffraction methods. The comparison between numerical and experimental results makes potentially possible the determination of degree of fatigue degradation of the material by observing the macroscopic stress state and the broadening of the diffraction peak width (FWHM), which is an indicator of the existence of micro-stress related to the dislocation density and grain size.
Źródło:
Fatigue of Aircraft Structures; 2021, 13; 54--71
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of basic position in Refill Friction Stir Spot Welding of 2024-T3 and D16UTW aluminum alloy sheets
Autorzy:
Lacki, P.
Derlatka, A.
Gałaczyński, T.
Powiązania:
https://bibliotekanauki.pl/articles/351991.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Refill Friction Stir Spot Welding
RFSSW
aluminum alloy
basic position
Opis:
One of the important parameters of Refill Friction Stir Spot Welding is the so-called basic position of the tool. This is the arrangement of the pin and sleeve which occurs when the tool is plunged into the material. The basic positions can be divided into two categories. In the first category, the sleeve and the pin are above the sheet surface or below sheet surface and in the second category the pin is retracted within the sleeve or protrudes from it. The aim of the work was to test four settings of the basic position, and then determine the best setting of the basic position, without changing the other welding parameters. Joints made of an aluminum alloy 2024-T3 sheet having a thickness of 1.0 mm and an aluminum alloy D16UTW sheet having a thickness of 0.6 mm were analysed. The best setting of the basic position was determined based on assessment of the force carried in shear test, macrostructure and weld face of the joints.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 443-449
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of RFSSW parameters on the load bearing capacity of aluminum 7075-T6 sheet metal joints
Autorzy:
Kluz, Rafał
Kubit, Andrzej
Wydrzyński, Dawid
Powiązania:
https://bibliotekanauki.pl/articles/103367.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
friction stir spot welding
aluminium 7075-T6
process parameters
zgrzewanie tarciowe
parametry procesu
Opis:
Friction Stir Spot Welding is one of the most contemporary methods of joining metals and alloys in their solid state. The ability to join elements made of aluminum alloys allows for utilizing this method in the manufacturing of aircraft structures while lowering the work load, costs, and weight, without sacrificing or even having better strength parameters than classic methods of joining elements. It ensures constant joint parameters, however it requires the use of optimal welding parameters such as: the rotational speed of the tool, tool delve depth, and welding time. The work presents the results of experiments conducted on 7074 aluminum sheet metal that was 1.8 and 0.8 mm thick, which conducted in accordance with the PS/DK32 research plan. The welding tests were done on a dedicated spot welding machine, while the strength tests consisted of static tensile strength tests. In the final part of the article contains an analysis and interpretation of the results.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 2; 35-41
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Process Parameters on Microstructure and Mechanical Properties of RFSSW Lap Joints of Thin Al7075-T6 Sheets
Autorzy:
Andres, J.
Wrońska, A.
Gałaczyński, T.
Luty, G.
Burek, R.
Powiązania:
https://bibliotekanauki.pl/articles/353978.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
refill friction stir welding
lap joining
aerostructures
aluminum alloy
alclad
Opis:
Refill friction stir spot welding (RFSSW) is a new technique of metal structures joining. Within the framework of activities of PZL Mielec in R&D area (program Innolot) researches are realized which aim is to develop the RFSSW technology as a method of joining thin aluminum elements used in aircrafts constructions. The paper presents results of investigations on the RFSSW lap joints welded using rotations in the range from 1500 to 2000 rpm and tool sleeve plunge depth from 1.6 to 1.8 mm. Thin aluminum sheets of thickness 0.8 and 1.6 mm coated with alclad or anodized were welded. Results of the investigations prove that the most common cause of specimens breaking was presence of geometrical defect – the so called hook and weak bonding between parent material and working area of internal sleeve of RFSSW tool. The best tensile strength was reached in case of joint welded at rotational speed 2000 rpm and tool plunge depth 1.6 mm and 1.7 mm (5.37 kN and 5.87 kN adequately). These joints were characterized by very fine and uniform microstructure in the area between sleeve stirred zone and parent material.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 39-43
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Plunge Depth on the Strength Properties of Friction Welded Joints Using the RFSSW Method
Autorzy:
Kluz, Rafał
Kubit, Andrzej
Wydrzyński, Dawid
Powiązania:
https://bibliotekanauki.pl/articles/102342.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
friction stir welding
joining aluminium alloys
refile friction spot stir welding
zgrzewanie tarciowe
łączenie stopów aluminium
spawanie punktowe z mieszaniem punktowym
Opis:
The Refill Friction Stir Spot Welding (RFSSW) method consists of three variable process parameters: rotational speed, tool plunge time and depth. The article presents an analysis of the effects tool plunge depth on shear strength. For this purpose, samples had a shearing load applied in a device prepare for this purpose. The shear strength was determined. An analysis of the results showed that tool plunge has a large effect on the strength of the joint and the structure of the joint. Depending on the tool plunge value, three types of joint failure were observed during the static shear strength test.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 1; 41-47
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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