Early Strain Localization in Strong Work Hardening Aluminum Alloy (2198 T3): 3D Laminography and DVC Measurement
The effect of strain hardening on localization in front of a notch is assessed by following the interactions between strain concentrations, damage, initial microstructure and grain orientations. A CT-like specimen made of strong work hardening 2198 T3 aluminum alloy is subjected to an in situ synchrotron laminography experiment. Kinematic fields are measured via digital volume correlation. The final results are bulk displacement and strain fields including their corresponding resolutions. The reported results refer to the portion of the specimen around 1 mm away from the notch root. With the selected spatial resolution, damage nucleation and growth is evaluated in strained bands until the very end of the loading process.
KeywordsDigital Volume Correlation (DVC) Flat-to-slant transition High work hardening material Laminography Plastic flow
The financial support of the Fédération Francilienne de Mécanique and Agence Nationale de la Recherche (ANR-14-CE07-0034-02 grant for COMINSIDE project) is gratefully acknowledged. Constellium C-Tech supplied the material. We acknowledge the European Synchrotron Radiation Facility for provision of beamtime at beamline ID19 (experiments MI-1149 and MA-1631).
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