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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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Ab-initio Predictions of Plastic Anisotropy in BCC Metals
Acoustic Emission Measurements During In-situ Scanning Electron Microscopy Experiments to Quantifying Damage Accumulation and Crack Initiation in Microcrystals
Assessing Crack Propagation Along Brittle/Ductile Interfaces
Core Structure and Mobility of Dislocations in Alpha-Ti
Deformation Behavior of Additively Manufactured Cu-Fe Composites at Different Strain Rates
Development of TiAl Alloys for High Temperature Applications
Dislocation-grain Boundary Interaction Investigations Using In-situ DIC and EBSD
Effect of Loading Rate on Fracture Behavior of Magnesium Alloys
Examination of Local Microscale-microsecond Temperature Rise in HMX-HTPB Energetic Material under Impact Loading
Experimental and Numerical Investigation into Mechanical Degradation of Polymers and Polymer Composites
Fabrication of Microscale Specimens via Additive Manufacturing for In-situ Mechanical Testing
Fracture Across Length Scales in Tungsten: A Combined Experimental and Predictive Approach
High Throughput Creep Data Acquisition by Cantilever Bending Coupled to Digital Image Correlation
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In-situ Dynamic Stress Field Detection using 2D Mechanical Raman Spectroscopy
In-situ Mechano-electrochemical Coupling of Structural Supercapacitor Electrodes
In-situ TEM Investigation of the Electroplasticity Phenomenon in Metals
In-situ TEM Investigation on Pyramidal Dislocations in Magnesium
Investigating Bulk Mechanical Properties on a Micro-scale: Micro-tensile Testing of Ultrafine Grained Ni-SiC Composite to Determine its Fracture Mechanism and Strain Rate Sensitivity
Micropillar Compression Testing with In-situ Raman Spectroscopy to Study Plastic Deformation in Vitreous Silica
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Microtensile Testing of (fcc) Copper and (hcp) Titanium at Elevated Temperatures
Mixed-mode Fracture Behavior of Magnesium Alloys
Multiscale Modeling to Determine Bulk Material Property from Miniature Specimen Testing
Numerical Study of Plastic Deformation Mechanisms in a New Generation Fe-TiB2 Steel Composite Using a FFT-based Model
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Quantifying Deformation Mechanics of High Temperature Alloys using In-situ and Digital Imaging Correlation (DIC) Testing Techniques
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Synchronized Indentation and Raman Spectroscopy for Crystal Engineering
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