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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



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., Deng, C., & 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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