Acoustic emission behavior during fatigue crack of API5LX70 gas pipeline steel

M. F M Yusof, C. K E Nizwan, Nordin Jamaludin, Shahrum Abdullah

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationApplied Mechanics and Materials
Pages148-152
Number of pages5
Volume80-81
DOIs
Publication statusPublished - 2011
Event2011 International Conference on Information Engineering for Mechanics and Materials, ICIMM 2011 - Shanghai
Duration: 13 Aug 201114 Aug 2011

Publication series

NameApplied Mechanics and Materials
Volume80-81
ISSN (Print)16609336
ISSN (Electronic)16627482

Other

Other2011 International Conference on Information Engineering for Mechanics and Materials, ICIMM 2011
CityShanghai
Period13/8/1114/8/11

Fingerprint

Gas pipelines
Acoustic emissions
Steel
Crack initiation
Fatigue of materials
Crack propagation
Fatigue cracks
Cracks
Crack closure

Keywords

  • Acoustic emission
  • API5L X70 steel
  • Fatigue
  • Global statistical parameter

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Yusof, M. F. M., Nizwan, C. K. E., Jamaludin, N., & Abdullah, S. (2011). Acoustic emission behavior during fatigue crack of API5LX70 gas pipeline steel. In Applied Mechanics and Materials (Vol. 80-81, pp. 148-152). (Applied Mechanics and Materials; Vol. 80-81). https://doi.org/10.4028/www.scientific.net/AMM.80-81.148

Acoustic emission behavior during fatigue crack of API5LX70 gas pipeline steel. / Yusof, M. F M; Nizwan, C. K E; Jamaludin, Nordin; Abdullah, Shahrum.

Applied Mechanics and Materials. Vol. 80-81 2011. p. 148-152 (Applied Mechanics and Materials; Vol. 80-81).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Yusof, MFM, Nizwan, CKE, Jamaludin, N & Abdullah, S 2011, Acoustic emission behavior during fatigue crack of API5LX70 gas pipeline steel. in Applied Mechanics and Materials. vol. 80-81, Applied Mechanics and Materials, vol. 80-81, pp. 148-152, 2011 International Conference on Information Engineering for Mechanics and Materials, ICIMM 2011, Shanghai, 13/8/11. https://doi.org/10.4028/www.scientific.net/AMM.80-81.148
Yusof MFM, Nizwan CKE, Jamaludin N, Abdullah S. Acoustic emission behavior during fatigue crack of API5LX70 gas pipeline steel. In Applied Mechanics and Materials. Vol. 80-81. 2011. p. 148-152. (Applied Mechanics and Materials). https://doi.org/10.4028/www.scientific.net/AMM.80-81.148
Yusof, M. F M ; Nizwan, C. K E ; Jamaludin, Nordin ; Abdullah, Shahrum. / Acoustic emission behavior during fatigue crack of API5LX70 gas pipeline steel. Applied Mechanics and Materials. Vol. 80-81 2011. pp. 148-152 (Applied Mechanics and Materials).
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AB - 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.

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