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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
Presentation Title Effect of Loading Rate on Fracture Behavior of Magnesium Alloys
Author(s) Arjun Sreedhar S, Suraj Ravindran, Zev Lovinger, G Ravichandran, Narasimhan Ramarathinam
On-Site Speaker (Planned) Arjun Sreedhar S
Abstract Scope The static and dynamic fracture behavior of Mg AZ31 alloy are investigated using three-point bend specimens tested by loading with servo-hydraulic UTM and Hopkinson pressure bar, respectively. Displacement and strain fields are obtained in-situ using high-speed imaging and DIC technique. The strains along a cross-section away from crack plane are analysed to obtain the moment about the plastic hinge point. The energy release rate (J) history is determined using the moment-rotation data at the crack plane. SEM fractograph show transition from brittle (cleavage-like) features under static loading to ductile (fibrous) at high loading rate. Also, the dynamic fracture toughness increases with loading rate. The above behavior is attributed to inertia-driven loss of crack tip constraint with increase in loading rate which suppresses twin induced cracking and promotes void growth and coalescence. This corroborates with quasi-static experiments on effect of notch acuity on failure mechanisms and toughness of Mg alloys.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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