Understanding Crystallographic Effects on Strain Localization in a 6016 Aluminium Alloy under Plane Strain Tension Using Correlative X-ray Lab Tomography
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This work aims at understanding the effects of grain structure on strain localization leading to failure when stamping a 6016 aluminium alloy sheet. A miniaturized plane strain tensile specimen was designed to study this critical strain state for formability. After obtaining the three dimensional grain map in the central region of the specimen with Diffraction Contrast Tomography (DCT) non-destructively, an in situ tensile test imaged by Absorption Contrast Tomography (ACT) was then carried out in 12 increments up to fracture. The projection-DIC technique is used to compute the real internal strain field in the specimen. A heterogeneous strain field with localization bands and matching fracture location is revealed. Subsequently, a crystal plasticity simulation performed on the complete grain map of the specimen provides the simulated internal strain field. A comparison between simulated and experimental results is made.
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