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Fracture mechanism and toughness of a rolled magnesium alloy under dynamic loading

Sreedhar S., Arjun and Ravindran, Suraj and Shankar, Gyan and Suwas, S. and Narasimhan, N. (2021) Fracture mechanism and toughness of a rolled magnesium alloy under dynamic loading. Acta Materialia, 202 . pp. 350-365. ISSN 1359-6454. doi:10.1016/j.actamat.2020.10.059.

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Static and dynamic fracture experiments are performed using fatigue pre-cracked three-point bend specimens of a rolled AZ31 Mg alloy on a servo-hydraulic universal testing machine and a Hopkinson bar setup, respectively. The results are interpreted using in-situ optical imaging along with digital image correlation analysis. Microstructural analysis reveals that the fracture mechanism changes from twin-induced quasi-brittle cracking for static loading to micro-void growth and coalescence under dynamic loading accompanied by decrease in tensile twinning near the tip with loading rate. By contrast, the density of twins near the far-edge of the ligament and associated texture change enhance strongly with loading rate. The fracture toughness increases dramatically at high loading rates which is attributed to enhanced work of separation and dissipation in the background plastic zone.

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Ravindran, Suraj0000-0003-2930-7906
Additional Information:© 2020 Acta Materialia Inc. Published by Elsevier Ltd. Received 8 June 2020, Revised 14 October 2020, Accepted 26 October 2020, Available online 2 November 2020. R. Narasimhan would like to gratefully acknowledge the Science and Engineering Research Board (Government of India) for financial support through the J.C.Bose Fellowship research grant. The authors would like to thank Professor G. Ravichandran for providing experimental facilities and Dr. Zev Lovinger for helping with the dynamic tests. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Science and Engineering Research Board (SERB)UNSPECIFIED
Subject Keywords:Dynamic fracture initiation; Rolled Mg alloy; Texture; Tensile twinning; Crack tip constraint; Fracture toughness
Record Number:CaltechAUTHORS:20201104-144153856
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Official Citation:Arjun Sreedhar S, Suraj Ravindran, Gyan Shankar, S. Suwas, R. Narasimhan, Fracture mechanism and toughness of a rolled magnesium alloy under dynamic loading, Acta Materialia, Volume 202, 2021, Pages 350-365, ISSN 1359-6454, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106435
Deposited By: Tony Diaz
Deposited On:05 Nov 2020 00:37
Last Modified:16 Nov 2021 18:54

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