Understanding crystallographic effects on strain localization in a 6016 aluminium alloy under plane strain tension using correlative X-ray lab tomography
Résumé
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 inspired by Park et al. [1] 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 [2], an in situ tensile test imaged by Absorption Contrast Tomography (ACT) was then carried out in 12 increments up to fracture (see Figure 1). 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 (see Figure 1.b). 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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