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    Wyświetlanie 1-5 z 5
    Tytuł:
    Porównanie modelowania MES z wykorzystaniem elementów bryłowych i osiowosymetrycznych na przykładzie zamykania nitu na prasie
    Autorzy:
    Gadalińska, Elżbieta.
    Kaniowski, Jerzy.
    Wronicz, Wojciech.
    Powiązania:
    Biuletyn Wojskowej Akademii Technicznej 2010, nr 4, s. 379-398
    Data publikacji:
    2010
    Tematy:
    Połączenia konstrukcyjne badanie
    Nitowanie
    Metody badawcze
    Wytrzymałość materiałów
    Opis:
    Rys.
    Bibliogr.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    Laser Powder Bed Fusion and Selective Laser Melted Components Investigated with Highly Penetrating Radiation
    Autorzy:
    Gadalińska, Elżbieta
    Pawliszak, Łukasz
    Moneta, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2105190.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    neutron diffraction
    synchrotron diffraction
    residual stress measurements
    additive manufacturing
    SLM
    LPBF
    Opis:
    Methods of incremental manufacturing, i.e. 3D printing, have been experiencing significant growth in recent years, both in terms of the development of modern technologies dedicated to various applications, and in terms of optimizing the parameters of the process itself so as to ensure the desired mechanical and strength properties of the parts produced in this way. High hopes are currently being pinned on the use of highly penetrating types of radiation, i.e. synchrotron and/or neutron radiation, for quantitative identification of parameters characterizing objects produced by means of 3D printing. Thanks to diffraction methodologies, it is feasible to obtain input information to optimize 3D printing procedures not only for finished prints but also to monitor in situ printing processes. Thanks to these methodologies, it is possible to obtain information on parameters that are critical from the perspective of application of such obtained elements as stresses generated during the printing procedure itself as well as residual stresses after printing. This parameter, from the point of view of tensile strength, compression strength as well as fatigue strength, is crucial and determines the possibility of introducing elements produced by incremental methods into widespread industrial use.
    Źródło:
    Fatigue of Aircraft Structures; 2021, 13; 81--98
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Stress Values in the Surface Layer of Inconel 718 Samples Dedicated to Fatigue Tests
    Autorzy:
    Gadalińska, Elżbieta
    Michałowski, Andrzej
    Czarnewicz, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/97839.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    turning
    grinding
    X-ray diffraction
    stress analysis
    Inconel 718
    Opis:
    This work deals with the problem of X-ray stress determination on the samples dedicated to fatigue tests. A number of research studies point out the fact that the processing of hard, difficult to machine materials like nickel superalloys, reveals more than one trend of residual stress versus working parameters of behaviour (Lavella and Berruti, 2010). Many papers have shown that the residual stresses are dependent on a combination of a number of factors. When the above is taken into account simultaneously with the requirements of the internal General Electric specification for the fatigue tests samples preparation (Metallic test specimen preparation, low stress, 2017) the problem of turning and grinding parameters gathers significance. It is well known that the quality of the surface layer, produced during machining, is of vital importance for the fatigue life specially for the components of aircraft produced form nickel superalloys e.g. Inconel 718 (Kortabarri et al., 2011). That is why the surface layer’s properties are described in detail by the standards. The aim of the work is to determine one of the most influential features from the point of view of fatigue life, i.e. the stress state on the surface layer with one non-destructive method - the diffraction analysis.
    Źródło:
    Fatigue of Aircraft Structures; 2019, 11; 78-86
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Laboratory Diffraction Methods in Characterization of Elements Made By Additive SLM Methods - State of the Art
    Autorzy:
    Gadalińska, Elżbieta
    Pawliszak, Łukasz
    Moneta, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2105183.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    X-ray diffraction
    residual stress measurements
    additive manufacturing
    SLM
    Opis:
    The greatest challenge of widely developed incremental manufacturing methods today is to obtain, as a result of the manufacturing process, such components that will have acceptable strength properties from the point of view of a given application. These properties are indirectly determined by three key characteristics: the level of surface residual stress, the roughness of the component and its porosity. Currently, the efforts of many research groups are focused on the problem of optimizing the parameters of incremental manufacturing so as to achieve the appropriate level of compressive residual stress, the lowest possible porosity and the lowest possible roughness of parts obtained by 3D methods. It is now recognized that determining the level of these three parameters is potentially possible using experimental X-ray diffraction methods. The use of this type of radiation, admittedly, is only used to characterize the surface layer of elements, but its undoubted advantage is its easy availability and relatively low cost compared to experiments carried out using synchrotron or neutron radiation.
    Źródło:
    Fatigue of Aircraft Structures; 2021, 13; 72--80
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    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
      Wyświetlanie 1-5 z 5

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