A fatigue testing in complex stress state in the context of problems in the diagnosis and detecting defects in materials of wheels in locomotives

• Autorzy: Czapczyk K.
• Języki publikacji: EN

Abstrakty

EN

This paper presents preliminary results of fatigue tests of selected construction materials, which have been exposed to the simultaneous operation of the bending and torsional loads at different mix of these loads. This kind of load generally applies to much responsible construction, especially of machinery for transport. For example, rail transport is one of the most popular measures, which uses different types of locomotives. However, it is no matter what sort of the type of railway vehicle it is, because in each there we can notice a multi-axis load driving axle wheel assemblies. During the technical inspection of these items, ultrasonic flaw detectors are used to detect damage in the material that arose during the exploitation, but are not visible during the external inspection. For this reason, there are many problems, that arise during the diagnostic process using ultrasonic flaw detectors, because it is not always possible to accurately detect the resulting or arising defect in the material axes, especially in some of the built-axes, which can be studied only from the front (on both sides of the mounting of bearings). Taking into account the safety and technical problems in rail transport, it is important to carry out fatigue tests of low- and high-cycles on samples subjected to multiaxial stress state. Initially, there were taken into account the lightweight aluminum (AlMg2Mn0.47Fe0.5) that have been repeatedly multiaxial charged at different percentage of bending and twisting. The results will be referenced to the occurrence of the bending and twisting, as well as to the results obtained with the simultaneous influence of corrosive conditions due to the attempt to make the best possible mapping of the prevailing conditions in which different structural elements must actually work. The load on the low cycle fatigue and high cycle fatigue were chosen after corrosion- stress testing on the same aluminum alloy. In addition, cases of multiaxial fatigue are not as described and explained in detail as the cases of uniaxial fatigue. In spite of this fact, it is necessary to create detailed criterions for multiaxial with low- and high-cycles load.

Słowa kluczowe

EN

multiaxial fatigue; bending; twisting; low cycle load; high cycle load; axles of locomotives

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2012
• Tom: Vol. 19, No. 4
• Strony: 149--154
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Czapczyk K.

• Gdynia Maritime University, Faculty of Marine Engineering Morska Street 81-87, 81-225 Gdynia, Poland tel.: [phone], fax: [phone],

Bibliografia

• [1] Bawolski, R., Chmiel, E., Skibka, C., Świderski, Z., Defektoskopowe badanie elementów pojazdów szynowych, Wydawnictwa Komunikacji i Łączności, Warszawa 1979.
• [2] Gąsowski, W., Wagony kolejowe – Konstrukcje i badania, Wydawnictwa Komunikacji i Łączności, Warszawa 1988.
• [3] Janiak, M., Kalinkowski, A., Konstrukcja i eksploatacja wagonów kolejowych, Wydawnictwa Komunikacji i Łączności, Warszawa 1979.
• [4] Praca zbiorowa Autorów Czechosłowackich, Niemieckich, Polskich, Węgierskich, Aluminium Poradnik, Warszawa, PWN 1967.
• [5] Sokołow, S. I. (red.) i in., Badanie dynamiki i wytrzymałości wagonów pasażerskich, Wydawnictwa Komunikacji i Łączności, Warszawa 1983.
• [6] Gąsowski, W., Nowak, R., Badania wagonów kolejowych, Wydawnictwo Politechniki Poznańskiej, Poznań 1989.
• [7] Kalinkowski, A., Orlik, A., Wagony kolejowe i hamulce, Wydawnictwa Komunikacji i Łączności, Warszawa 1981.