Fracture analysis of the pulley of a bucket wheel boom hoist system

Bošnjak, S.; Arsić, M.; Savićević, S.; Milojević, G.; Arsić, D.

doi:10.17531/ein.2016.2.1

Artykuł - szczegóły

Tytuł artykułu

Fracture analysis of the pulley of a bucket wheel boom hoist system

Autorzy

Bošnjak S. , Arsić M. , Savićević S. , Milojević G. , Arsić D.

Treść / Zawartość

Pełne teksty:

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Identyfikatory

DOI

10.17531/ein.2016.2.1

Warianty tytułu

Analiza pęknięć koła pasowego układu wciągarki Wysięgnika koła czerpakowego

Języki publikacji

Abstrakty

This paper presents the results of the pulley fracture analysis. Experimental investigations confirmed that the chemical composition and basic mechanical properties of the pulley material, except the impact energy at a temperature of –20°C, meet the requirements of the corresponding standard. The impact energy value at the temperature of –20°C is for ≈45% lower than the prescribed value which has considerable influence on the appearance of the brittle fracture, especially having in mind the fact that the bucket wheel excavators operate at low temperatures. Metallographic examinations as well as magnetic particle inspections indicated that initial cracks in the welded joints occurred during the manufacture of the pulleys. Characteristic levels of the rope load cycle are obtained by using in-house software which includes the dynamic effects of the resistance-to-excavation. The FEA results pointed out that in the representative load cases the combinations of the mean stress and the alternating stress in the pulley critical zone lie considerably below the limit line of the modified Goodman’s diagram. The conclusion, based on the presented results, is that the fracture of the pulley appeared as the result of the ‘manufacturing-in’ defects.

Artykuł przedstawia wyniki analizy pęknięć koła pasowego. Badania doświadczalne potwierdziły, że skład chemiczny oraz podstawowe właściwości mechaniczne materiału, z którego zostało wykonane koło pasowe, za wyjątkiem energii udaru w temperaturze –20°C, były zgodne z odpowiednią normą. Wartość energii udaru w temperaturze –20°C była o ≈45% niższa od wartości zalecanej, co ma znaczący wpływ na występowanie pękania kruchego, zwłaszcza gdy weźmie się pod uwagę fakt, że koparki kołowe są przeznaczone do pracy w niskich temperaturach. Badania metalograficzne oraz badania magnetyczno-proszkowe wykazały, że pęknięcie pierwotne w połączeniu spawanym pojawiło się już w fazie produkcji koła pasowego. Charakterystyczne poziomy cyklu obciążenia liny uzyskano stosując własne oprogramowanie, które uwzględnia dynamiczne oddziaływanie odporności na urabianie. Wyniki MES pokazały, że w przypadku obciążeń reprezentatywnych, wartości średniego naprężenia w funkcji naprężenia zmiennego w strefie krytycznej koła pasowego były znacznie niższe niż wartości graniczne wyznaczone na podstawie zmodyfikowanego wykresu Goodmana. Na podstawie otrzymanych wyników stwierdzono, że pęknięcie koła pasowego powstało wskutek wad produkcyjnych.

Słowa kluczowe

bucket wheel excavator pulley fracture experimental investigations FE stress analyses

koparka kołowa pęknięcie koła pasowego badania doświadczalne analiza naprężeń metodą elementów skończonych

Wydawca

Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne

Czasopismo

Eksploatacja i Niezawodność

Rocznik

2016

Tom

Vol. 18, no. 2

Strony

155--163

Opis fizyczny

Bibliogr. 40 poz., fot., rys., tab.

Twórcy

autor

Bošnjak S.

sbosnjak@mas.bg.ac.rs

University of Belgrade Faculty of Mechanical Engineering Kraljice Marije 16, 11120 Belgrade 35, Serbia

autor

Arsić M.

miodrag.arsic@institutims.rs

Institute for Testing of Materials IMS Bulevar Vojvode Mišića 43, 11000 Belgrade, Serbia

autor

Savićević S.

sreto@ac.me

University of Montenegro Faculty of Mechanical Engineering Džordža Vašingtona bb, 81000, Podgorica, Montenegro

autor

Milojević G.

gmilojevic@mas.bg.ac.rs

University of Belgrade Faculty of Mechanical Engineering Kraljice Marije 16, 11120 Belgrade 35, Serbia

autor

Arsić D.

dusan.arsic@fink.rs

University of Kragujevac Faculty of Engineering Sestre Janjić 6, 34000 Kragujevac, Serbia

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