Autor: Przybylowicz, Michal - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Experimental and theoretical evaluation of side tamping method for ballasted railway track maintenance
Autorzy:: Przybylowicz, Michal
Sysyn, Mykola
Kovalchuk, Vitalii
Nabochenko, Olga
Parneta, Bogdan
Powiązania:: https://bibliotekanauki.pl/articles/1841194.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: railway ballast
ballast tamping
photogrammetric measurements
FEM simulation
podsypka kolejowa
podbijanie tłucznia
pomiary fotogrametryczne
symulacja FEM
Opis:: Ballast layer is the most weak element of railway track that causes track geometry deterioration. At the same time, it is subjected to intensive particle breakage during the corrective tamping. This causes high maintenance costs of ballasted track. The present paper is devoted to the study of tamping methods. The present machine tamping methods are considered and compared. The possible influence of the tamping technology on the ballast-related maintenance costs is analyzed. The side tamping technology is studied in detail with theoretical and experimental methods. The process of material transport during the side tamping is studied using a scale model of ballast layer and photogrammetric measurements. A theoretical finite element model (FEM) is validated to the experimental results. The study shows that the side tamping is a promising method for the development of a universal, superstructure independent tamping technology.
Źródło:: Transport Problems; 2020, 15, 3; 93-106
1896-0596
2300-861X
Pojawia się w:: Transport Problems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Thermal-mechanical finite element simulation of flat bar rolling coupled with a stochastic model of microstructure evolution
Autorzy:: Szeliga, Danuta
Czyżewska, Natalia
Kusiak, Jan
Kuziak, Roman
Morkisz, Paweł
Oprocha, Piotr
Pietrzyk, Maciej
Piwowarczyk, Michał
Poloczek, Łukasz
Przybyłowicz, Paweł
Rauch, Łukasz
Wolańska, Natalia
Powiązania:: https://bibliotekanauki.pl/articles/29520070.pdf
Data publikacji:: 2022
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: flat bars
hot rolling
thermal-mechanical finite element model
microstructure evolution
stochastic model
Opis:: It is generally recognized that the kinetics of phase transformations during the cooling of steel products depends to a large extent on the state of the austenite after rolling. Austenite deformation (when recrystallization is not complete) and grain size have a strong influence on the nucleation and growth of low-temperature phases. Thus, the general objective of the present work was the formulation of a numerical model which simulates thermal, mechanical and microstructural phenomena during multipass hot rolling of flat bars. The simulation of flat bar rolling accounting for the evolution of a heterogeneous microstructure was the objective of the work. A conventional finite-element program was used to calculate the distribution of strains, stresses, and temperatures in the flat bar during rolling and during interpass times. The FE program was coupled with the stochastic model describing austenite microstructure evolution. In this model, the random character of the recrystallization was accounted for. Simulations supplied information about the distributions of the dislocation density and the grain size at various locations through the thickness of the bars.
Źródło:: Computer Methods in Materials Science; 2022, 22, 3; 137-148
2720-4081
2720-3948
Pojawia się w:: Computer Methods in Materials Science
Dostawca treści:: Biblioteka Nauki

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