Abstract
A feasibility study of measuring 3D displacement fields in the bulk during ductile crack initiation via combined Synchrotron Radiation Computed Laminography (SRCL) and Digital Volume Correlation (DVC) is performed. In contrast to tomography, SRCL is a technique that is particularly adapted to obtain three-dimensional (3D) reconstructed volumes of objects that are laterally extended (i.e., in 2 directions) and thin in the third direction, i.e. sheet-like objects. In-situ laminography data of an initiating crack ahead of a machined notch are used with a voxel size of 0.7 μm. The natural contrast of the observed 2XXX Al-alloy caused by intermetallic particles and initial porosity is used to measure displacement fields via a global DVC technique assuming a continuous displacement field. An initial performance study is carried out on data of the same undeformed material but after a substantial shift of the laminography rotation axis with respect to the imaged specimen. Volume correlations between different loading steps provide displacement fields that are qualitatively consistent with the remote loading conditions. Computed strain fields display a strain concentration close to the notch tip.
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Notes
The resolution of a measuring system is the ‘smallest change in a quantity being measured that causes a perceptible change in the corresponding indication’ [42]. With this definition, high resolution levels do not allow small fluctuations to be measured.
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Acknowledgements
The authors would like to acknowledge Ian Sinclair and Mark Mavrogordato from the University of Southampton for participating in/helping with the laminography experiment. Feng Xu is thanked for help with reconstruction of the data. Thibault Taillandier-Thomas is also thanked for running some resolution assessments.
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Morgeneyer, T.F., Helfen, L., Mubarak, H. et al. 3D Digital Volume Correlation of Synchrotron Radiation Laminography Images of Ductile Crack Initiation: An Initial Feasibility Study. Exp Mech 53, 543–556 (2013). https://doi.org/10.1007/s11340-012-9660-y
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DOI: https://doi.org/10.1007/s11340-012-9660-y