# Understanding crystallographic effects on strain localization in a 6016 aluminium alloy under plane strain tension using correlative X-ray lab tomography

Maryse Gille, Henry Proudhon, Jette Oddershede, Thilo F. Morgeneyer

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Maryse Gille, Henry Proudhon, Jette Oddershede, Thilo F. Morgeneyer. Understanding crystallographic effects on strain localization in a 6016 aluminium alloy under plane strain tension using correlative X-ray lab tomography. XVII International Conference on Computational Plasticity, Sep 2023, Barcelone, Spain. hal-04345220

HAL Id: hal-04345220

https://hal.science/hal-04345220v1

Submitted on 14 Dec 2023

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Distributed under a Creative Commons CC BY 4.0 - Attribution - International License
UNDERSTANDING CRYSTALLOGRAPHIC EFFECTS ON
STRAIN LOCALIZATION IN A 6016 ALUMINIUM ALLOY
UNDER PLANE STRAIN TENSION USING CORRELATIVE X-
RAY LAB TOMOGRAPHY

Maryse Gille†*, Henry Proudhon†, Jette Oddershede†† and Thilo F. Morgeneyer†

† MINES Paris, PSL University, Centre des Matériaux, CNRS UMR 7633
BP 87, 91003 Evry, France

E-mail: maryse.gille@minesparis.psl.eu*; henry.proudhon@minesparis.psl.eu;
thilo.morgeneyer@minesparis.psl.eu, web page: https://www.mat.minesparis.psl.eu/

†† Xnovo Technology ApS
Galoche Alle 15, 1st floor, 4600 Køge, Denmark
E-mail: joddershede@xnovotech.com, web page: https://xnovotech.com/

ABSTRACT

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).

<figure><img src="image_2.png" /><figcaption>Figure 1 – a) Plane strain tension specimen before straining with the grain map obtained by DCT; b) Loading curve indicating the location of the 12 *in situ* ACT scans (blue crosses). Evolution of the strain field in tension direction $\epsilon_{yy}$ is displayed for 2 steps and can be compared with the location of final fracture shown on the *post mortem* scan.</figcaption></figure>

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.

REFERENCES

[1] N. Park, T. B. Stoughton, and J. W. Yoon, ‘A new approach for fracture prediction considering general anisotropy of metal sheets’, *International Journal of Plasticity*, vol. 124, pp. 199–225, 2020, doi: 10.1016/j.ijplas.2019.08.011.

[2] F. Bachmann, H. Bale, N. Gueninchault, C. Holzner, and E. Lauridsen, ‘3D grain reconstruction from laboratory diffraction contrast tomography’, *J Appl Crystallogr*, vol. 52, Jun. 2019, doi: 10.1107/S1600576719005442.