Damage assessment of Al alloys using in situ tensile tests in x-ray tomography

Suxia Zhou; Eric Maire; Jilong Xie; Andrea Bareggi; Jerome Adrien; Marco Dimichiel

doi:10.1117/12.839378

25 August 2009 Damage assessment of Al alloys using in situ tensile tests in x-ray tomography

Suxia Zhou, Eric Maire, Jilong Xie, Andrea Bareggi, Jerome Adrien, Marco Dimichiel

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73756F (2009) https://doi.org/10.1117/12.839378
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

This paper presents recent results by using in situ tensile experiments. Two axisymmetric samples (one smooth and the other one with a notch) where machined out of a standard 5741 aluminium alloy. In both cases, the different damage steps (initiation, growth and coalescence) have been clearly visualised during interrupted in situ tensile tests in synchrotron X ray tomography with a voxel size of 1.6 microns. The X ray tomography technique can be used like a simple microscopy technique with a slightly lower resolution than conventional ones and provides a different type of information in the form of three dimensional (3D) non destructive images of the bulk of the observed material. The method also describes precisely the outer shape of the sample and its change during deformation. This allows calculating precisely the true strain true stress curve of the sample and also an approximation of the stress triaxiality by the Bridgeman formula. The results show that damage can be visualised and that the early fracture of the notched sample is due to the higher triaxiality.

Citation Download Citation

Suxia Zhou, Eric Maire, Jilong Xie, Andrea Bareggi, Jerome Adrien, and Marco Dimichiel "Damage assessment of Al alloys using in situ tensile tests in x-ray tomography", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73756F (25 August 2009); https://doi.org/10.1117/12.839378

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