In situ 4D mechanical testing of structural materials: The data challenge

Abstract

This papers presents recent progress with materials investigations via in situ mechanical testing at the synchrotron, so called 4D experiments. More automated and more integrated stress rigs now allow to produce new kind of data sets to study deformation and fracture of structural materials. Two recent examples are presented, one with a polymer material and another one with a polycrystalline metallic alloy. Challenges with data organisation and storage and automatic analysis are discussed in the view of the upgrade of the main synchrotron sources which will greatly increase the number and size of the future data sets.

On crystallographic aspects of heterogeneous plastic flow during ductile tearing: 3D measurements and crystal plasticity simulations for AA7075-T651

“…In the past two decades, three-dimensional (3D) imaging techniques have allowed damage to be studied and to be quantified in situ (i.e., under mechanical load (Maire et al, 2001;Landron et al, 2012;Maire and Withers, 2014;Proudhon et al, 2020)). These techniques may help to better understand and predict the link between failure strain and stress triaxiality at low levels of stress triaxiality (Tancogne-Dejean et al, 2020).…”

Formation and annihilation of stressed deformation twins in magnesium

“…While our data show that it was possible that some of the low Schmid factor twins nucleated due to slip transfer, the recorded frequency of this event is not high enough to solidify any conclusion. Higher resolution techniques, such as diffraction contrast tomography 8,39 , that can provide details of grain boundaries in 3D are required. This paper provides some evidence that twins are more stressed than their corresponding parents at the early stages of plasticity.…”

A Multi-modal Data Merging Framework for Correlative Investigation of Strain Localization in Three Dimensions

“…More specific analyses should be conducted to further investigate this aspect. Techniques able to probe slip band connection both on the surface and within the bulk, such as topo-tomography, 43,44 Fig. 6.…”