In situ high speed imaging study and modelling of the fatigue fragmentation of dendritic structures in ultrasonic fields

Wang, S.; Kang, J.; Guo, Z.; Lee, T. L.; Zhang, X.; Wang, Q.; Deng, C.; Mi, J.

doi:10.1016/j.actamat.2018.11.053

In situ high speed imaging study and modelling of the fatigue fragmentation of dendritic structures in ultrasonic fields

Wang, S.; Kang, J.; Guo, Z.; Lee, T. L.; Zhang, X.; Wang, Q.; Deng, C.; Mi, J.

Authors

S. Wang

J. Kang

Z. Guo

T. L. Lee

X. Zhang

Q. Wang

C. Deng

Professor Jiawei Mi J.Mi@hull.ac.uk
Professor of Materials

Abstract

The fatigue fragmentation of dendritic structures of a SCN-5wt.% Camphor transparent alloy in an ultrasound field was investigated systematically using high-speed imaging. Dynamic interactions between oscillating ultrasonic bubbles and the primary and secondary dendrites were observed and recorded. High speed images show that when an ultrasound bubble was trapped inside an interdendritic region, the oscillation of the bubble can cause cyclic bending of the dendritic arms. Consequently, a fatigue type crack initiated at the arm root and propagated through the dendrite, causing the dendrite to fragment, i.e. dendritic fragmentation. From the recorded videos, the cycle numbers for the fatigue fragmentation were extracted, then, the fatigue strength and fatigue life of the SCN-5wt.% Camphor transparent alloy were calculated. Results showed that the cyclic fatigue load cause a crack initiating on a SCN dendrite at a much lower stress level than its tensile strength under high frequent oscillation.

Citation

Wang, S., Kang, J., Guo, Z., Lee, T. L., Zhang, X., Wang, Q., …Mi, J. (2019). In situ high speed imaging study and modelling of the fatigue fragmentation of dendritic structures in ultrasonic fields. Acta Materialia, 165, 388-397. https://doi.org/10.1016/j.actamat.2018.11.053

Journal Article Type	Article
Acceptance Date	Nov 28, 2018
Online Publication Date	Dec 5, 2018
Publication Date	Feb 15, 2019
Deposit Date	Apr 11, 2022
Publicly Available Date	Apr 12, 2022
Journal	Acta Materialia
Print ISSN	1359-6454
Publisher	Elsevier
Peer Reviewed	Peer Reviewed
Volume	165
Pages	388-397
DOI	https://doi.org/10.1016/j.actamat.2018.11.053
Keywords	Dendrites fragmentation; Ultrasonic bubble; Ultrasound; Oscillation; Fatigue crack
Public URL	https://hull-repository.worktribe.com/output/1173848

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Copyright Statement
© 2018 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).