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Effect of Specimen Thickness on Fatigue Crack Propagation and Acoustic Emission Behaviors in Q345 Steel

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Advances in Acoustic Emission Technology

Part of the book series: Springer Proceedings in Physics ((SPPHY,volume 158))

Abstract

The effects of specimen thickness on fatigue crack growth rate (FCGR) and acoustic emission (AE) behaviors of Q345 steel were investigated. The four-point bending fatigue tests were carried out with AE monitoring simultaneously. Based on the thickness effect analysis, fatigue behavior studies, and AE investigations, the effects of specimen thickness on AE signal and AE source mechanisms during fatigue crack propagation were proposed. The results show that as specimen thickness increased, the FCGR was accelerated slightly, while the AE count rate was increased significantly, suggesting that AE signal was more sensitive to the changes in thickness. By analyzing the AE signals at the new plastic yielding area and the crack tip micro-fracture process, AE source mechanisms were explained. These results suggest that the effects of thickness must be considered to obtain a more accurate estimation of fatigue crack propagation through AE technique.

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Acknowledgment

This work was financially supported by the following funds: (1) National Science and Technology Major Project: Life Management Technology of Nuclear Power Plant (No. 2011ZX06004-002) and (2) National Natural Science Foundation of China (No. 51175023).

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Authors and Affiliations

  1. Key laboratory of aerospace advanced materials and performance (Beihang University), Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Junrong Li, Hongyun Luo, Zhiyuan Han & Feixiang Jin

Authors
  1. Junrong Li
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  2. Hongyun Luo
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  3. Zhiyuan Han
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  4. Feixiang Jin
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Corresponding author

Correspondence to Hongyun Luo .

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Editors and Affiliations

  1. China Special Equipment Inspection & Research Institute, Beijing, China

    Gongtian Shen

  2. China Special Equipment Inspection & Research Institute, Beijing, China

    Zhanwen Wu

  3. China Special Equipment Inspection & Research Institute, Beijing, China

    Junjiao Zhang

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Li, J., Luo, H., Han, Z., Jin, F. (2015). Effect of Specimen Thickness on Fatigue Crack Propagation and Acoustic Emission Behaviors in Q345 Steel. In: Shen, G., Wu, Z., Zhang, J. (eds) Advances in Acoustic Emission Technology. Springer Proceedings in Physics, vol 158. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-1239-1_21

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  • DOI: https://doi.org/10.1007/978-1-4939-1239-1_21

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  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4939-1238-4

  • Online ISBN: 978-1-4939-1239-1

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