Temat: fatigue endurance limit - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigation of Changes In the Modulus of Elasticity of the Surface Layer Material During Fretting Wear
Badanie zmian modułu sprężystości materiału warstwy powierzchniowej podczas Frettingu
Autorzy:: Bezjazychnyi, Vyacheslav F.
Szczerek, Marian
Lyubimov, Roman V.
Powiązania:: https://bibliotekanauki.pl/articles/188784.pdf
Data publikacji:: 2020
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: fretting-zużycie
warstwa powierzchniowa materiału
moduł sprężystości materiału
granica zmęczenia materiału
fretting wear
material surface layer
elasticity modulus of the material
fatigue endurance limit
Opis:: Przedstawiono technikę, zastosowany sprzęt i wyniki badania zmiany modułu sprężystości materiału warstwy powierzchniowej części podczas pracy części w warunkach frettingu-zużycia stykających się powierzchni. Przedstawiono zalecenia dotyczące praktycznego wykorzystania wyników badania.
The method, the equipment used, and the results of the study are described in relation to the regularity of changes in the modulus of elasticity of the part material surface layer during operation when the part is under conditions of fretting wear of the contacting surfaces. Recommendations for the practical use of the research results are given.
Źródło:: Tribologia; 2020, 289, 1; 13-19
0208-7774
Pojawia się w:: Tribologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Advanced determination of safety factor of fatique strength of coiled springs
Autorzy:: Aryassov, G.
Petritshenko, A.
Powiązania:: https://bibliotekanauki.pl/articles/1429162.pdf
Data publikacji:: 2008
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: coiled springs
fatigue failure
safety factor
alternate stress
endurance limit stress
Opis:: Coiled compression springs are widely used in suspension systems of vehicles, light weight trailers, trains etc and their task is to minimize dynamic loading effect to vehicles body or frame in different road condition over many years. In these systems, springs are exposed to large number of cycles of loading and determination of their durability and reliability quantities is important. Consequently, to increase the reliability of these systems, a more accurate determination of the values of the endurance limits of springs is necessary. Usually, in many strength problems, the major components of stress are static, with less accurately alternating stresses superposed. Most failures of springs are originated with stress of alternating type. The solution of problem is accomplished due to acting shear and axial stresses in plane of cross-section of spring wire. By existing theory, when springs are loaded by non-steady loading, then to consider of unlimited number of combinations of amplitude and mean stresses, the line of failure of the material must be used. Since experimental data for the line of failure of material are usually not at hand, it is customary to make a conservative approximation, that it is a straight line. However, use this straight line may give considerable mistakes on determination of the limit range stresses. To avoid fore aft mentioned mistakes, the method of approximation of the failure curve line by the line with the properly chosen parameters for the coiled compression and tension springs is proposed in this paper. Theory to use proper parameters in approximation of failure curve and calculation example with results is given as well.
Źródło:: Journal of Machine Engineering; 2008, 8, 4; 111-121
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The lifetime forecasting of machine elements by fatigue strength criterion
Autorzy:: Khomiak, Yuriy
Kibakov, Oleksandr
Medvedev, Stanislav
Nikolenko, Ilya
Zheglova, Victoria
Powiązania:: https://bibliotekanauki.pl/articles/1955230.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: fatigue curve parameters
endurance limit
fatigue fracture similarity equation
typical loading conditions
krzywa zmęczeniowa
parametry
wytrzymałość zmęczeniowa
pękanie zmęczeniowe
Opis:: The method for assessing the lifetime of structural elements by the criterion of fatigue strength is improved. It includes tests of laboratory material samples, the positions of the statistical theory of similarity of fatigue failure, calculation of the stress state by the finite elements method and takes into account the nature of cyclic loading with variable amplitude. A way for calculating the equivalence coefficient by the cycles μm is proposed, which takes into account the characteristics of fatigue strength and the cyclogram of the loading of the machine elements. Mathematical descriptions of integral distribution functions for typical loading modes (heavy, medium equiprobable, medium normal, light and especially light) are given and on their basis the corresponding loading cyclograms are obtained. The technique is implemented on the example of one of the main parts of an axial piston hydraulic machine (APHM) - a cylinder block (CB) made of tin bronze CuSn12. The possibilities of increasing the working pressure in the APHM by constructive and technological methods are analyzed. It is shown that in the manufacture of CВ from high-strength antifriction brass Zn28Mn3Co2, it is possible to increase the operating pressure in the APHM to 40 MPa, which for heavy duty operation will provide a CВ lifetime more than nine thousand hours.
Źródło:: Diagnostyka; 2021, 22, 4; 39-49
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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