Mohd Fadhlan, Mohd Yusof and Che Ku Eddy Nizwan, Che Ku Husin and Nordin, Jamaludin and S., Abdullah (2011) Acoustic emission behavior during fatigue crack of API5LX70 gas pipeline steel. In: International Conference on Information Engineering for Mechanics and Materials (ICIMM 2011) , 13-14 August 2011 , Shanghai, China. pp. 148-152., 80-81. ISSN 16609336 ISBN 978-303785212-5
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Abstract
This paper present Acoustic Emission (AE) generated during fatigue mechanism of API5LX70 steel which was widely use as gas pipeline materials. Fully reverse (R=-1) constant amplitude fatigue test were done with four different stress amplitudes which were 437.5MPa, 406.25Mpa, 390.6MPa and 359.4MPa respectively. An observation from those tests shows that AE Count gives a significant value during cyclic softening and bauschinger effect. Crack initiation indicated by rapid increase of AE count values at positive peak stress and followed by high AE count values around zero stress which indicate crack closure phenomena. Among all four tests, it was show that AE activity from fatigue test with amplitude of 359.4MPa can be significantly divided into 3 region which correspond to crack incubation stage, microplastic and slip plane formation stage and crack initiation and propagation stage. Further analysis was done by separating AE signals from those 3 regions into 6 different groups. Ten AE signatures from each group were selected to calculate AE RMS and AE kurtosis. Analyses on AE RMS which correspond to overall energy of the signal were useful to indicate the microplastic and slip plane formation stage and crack initiation and propagation stage while AE kurtosis was useful in indicating crack stage including initiation, propagation and closure stage.
| Item Type: | Conference or Workshop Item (Speech) |
|---|---|
| Additional Information: | Indexed by Scopus, WOS |
| Uncontrolled Keywords: | Acoustic Emission (AE); API5L X70 Steel; Fatigue; Global statistical parameter |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Faculty/Division: | Faculty of Mechanical Engineering |
| Depositing User: | Mrs. Neng Sury Sulaiman |
| Date Deposited: | 07 Feb 2020 01:32 |
| Last Modified: | 07 Feb 2020 01:32 |
| URI: | http://umpir.ump.edu.my/id/eprint/26181 |
| Download Statistic: | View Download Statistics |
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