| Issue |
MATEC Web Conf.
Volume 188, 2018
5th International Conference of Engineering Against Failure (ICEAF-V 2018)
|
|
|---|---|---|
| Article Number | 04022 | |
| Number of page(s) | 7 | |
| Section | Design of Components and Engineering Elements, Coatings, Failure Analysis | |
| DOI | https://doi.org/10.1051/matecconf/201818804022 | |
| Published online | 07 August 2018 | |
Fracture analysis of a cooling water pump shaft
1
University of West Attika, Department of Mechanical Engineering,
250 Thivon & Petrou Ralli Ave.
12244
Egaleo,
Greece
2
Stassinopoulos-Uddeholm, Steel Trading S.A.,
20 Athinon Str.
18540
Piraeus,
Greece
3
GasLog LNG Services Ltd.,
69 Akti Miaouli
18537
Piraeus,
Greece
Carmen Medrea: cmedtrea@puas.gr
Six shaft failures were encountered in a centrifugal water pump, part of the engine cooling system of a container ship. The last two failed pieces were received for analysis. A detailed study was carried out to determine the cause of the component failures. Historical data was collected, visual inspection was performed and a photographic file was created. The pieces were measured in order to record their general features and a 3-D model was generated. Hardness measurements were carried out. Microstructure was examined by means of light microscopy. A finite element simulation was conducted in order to determine the stress topology and to identify possible critical areas. Chemical analysis was carried out. The shafts were manufactured onboard, from AISI 304 stainless steel. The low hardness of both pieces indicates insufficient mechanical properties. Microstructural examination showed characteristic microstructure of coarse austenite. The presence annealing process derived twins and limited grain-boundary carbide precipitates were verified. The shafts failed due to torsional fatigue. Fracture initiated at the keyway on the propeller side as it was predicted from the finite elements analysis. Material selection material has and poor machining were found to be the main cause of failure. Appropriate recommendations were provided.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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