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

Sreedhar S, A and Ravindran, S and Shankar, G and Suwas, S and Narasimhan, R (2021) Fracture mechanism and toughness of a rolled magnesium alloy under dynamic loading. In: Acta Materialia, 202 . pp. 350-365.

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Official URL: http://doi.org/10.1016/j.actamat.2020.10.059


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. © 2020 Acta Materialia Inc.

Item Type: Journal Article
Publication: Acta Materialia
Publisher: Acta Materialia Inc
Additional Information: The copyright of this article belongs to Acta Materialia Inc
Keywords: Cracks; Dynamic loads; Dynamics; Fracture testing; Magnesium alloys; Optical correlation; Textures, Digital image correlations; Fracture mechanism change; Fracture mechanisms; High loading rate; Microstructural analysis; Three point bend specimen; Universal testing machines; Work of separation, Fracture toughness
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 23 Dec 2021 09:36
Last Modified: 23 Dec 2021 09:36
URI: http://eprints.iisc.ac.in/id/eprint/67264

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