Wszystkie pola: Nikolić, Ružica R. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Thermal fracture characteristics of an interface crack subjected to temperature variations
Autorzy:: Kalinović, Saša M.
Djoković, Jelena M.
Nikolić, Ružica R.
Hadzima, Branislav
Powiązania:: https://bibliotekanauki.pl/articles/1839517.pdf
Data publikacji:: 2020
Wydawca:: Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:: interface crack
two-layered sample
temperature variation
fracture properties
LEFM concept
pęknięcia
próba dwuwarstwowa
wahania temperatury
właściwości pękania
koncepcja LEFM
Opis:: Thermal fracture characteristics - the thermal energy release rate and thermal stress intensity factor of a semi-infinite crack at an interface between the two elastic isotropic materials, subjected to the temperature variations, are considered in this paper. Those characteristics are determined based on application of the linear elastic fracture mechanics (LEFM) concept. Expressions for obtained theoretical solutions are compared to solutions from literature and they are found to be more concise. Influence of the materials change on these two thermal fracture properties were observed, as well as the influence of the thickness ratio of the two layers constituting the interface.
Źródło:: Production Engineering Archives; 2020, 26, 2; 54-59
2353-5156
2353-7779
Pojawia się w:: Production Engineering Archives
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of different hard-facing procedures on quality of surfaces of regenerated gears
Autorzy:: Nikolić, Ružica R.
Marković, Svetislav
Arsić, Dušan
Lazić, Vukić
Hadzima, Branislav
Ulewicz, Robert
Powiązania:: https://bibliotekanauki.pl/articles/23968097.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:: regeneracja
napawanie
koło zębate
właściwości tribiologiczne
współczynnik tarcia
regeneration
hard-facing
gear
tribological properties
friction coefficient
Opis:: During the process of regeneration of machine parts, certain phenomena occur that have a significant impact on the loss of their working ability. Hereditary properties are expressed by the interdependence of geometric and physical-mechanical-metallurgical parameters of gear teeth created during the technological operations of regeneration of worn teeth by hard-facing. The influence of the type of additional material (electrodes and their combinations) on the tribological characteristics of welded gear teeth was considered, whereby the so-called hard additional materials were applied. Those are the additional materials that give the required surface hardness of the teeth without subsequent thermal or thermochemical treatment. This research did not involve the regeneration of specific worn gears removed from machine systems, but the new gears were made, which were then damaged and then regenerated by hard-facing using the shielded metal arc welding (SMAW) procedure. Thus, all the tested gears were made of the same material, belonged to one batch and were machined on the same machines with the same machining regimes. The tests were performed on samples made of 20MnCr5 steel for cementation, on a tribometer by the “block on disc” method, which was designed to simulate the operating conditions of coupled teeth of concrete gears in the exploitation conditions. Based on the conducted tribological tests, the average coefficients of friction and topography of the surfaces were determined by measuring the wear trace and it was defined which additional materials give the best tribological characteristics of the surfaces of gears regenerated by hard-facing.
Źródło:: Production Engineering Archives; 2021, 27, 4; 257--264
2353-5156
2353-7779
Pojawia się w:: Production Engineering Archives
Dostawca treści:: Biblioteka Nauki

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