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Characterization of internal fatigue cracks in aluminum alloys by simulation of phase contrast tomography

Abstract : Synchrotron Radiation Computed Tomography (SRCT) allows a better detection of fatigue cracks in metals than laboratory CT due to the existence of phase contrast. However the presence in reconstructed images of fringes at the edges of objects generated by Fresnel diffraction makes it difficult to identify and analyze the cracks quantitatively. Simulations of phase contrast synchrotron tomography images containing cracks with different sizes and shapes are obtained by using GATE software. Analyzing the simulation results, firstly, we confirmed that the bright parts with strong contrast in SRCT image are streak artifacts; secondly, we found that the gray scale values within the cracks in SRCT images are related to the crack size; these simulation results are used to analyse SRCT images of internal fatigue cracks in a cast Al alloy, providing a clearer visualisation of damage.
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https://hal.archives-ouvertes.fr/hal-03638496
Contributor : Jean Michel Létang Connect in order to contact the contributor
Submitted on : Thursday, April 28, 2022 - 12:12:48 PM
Last modification on : Thursday, June 23, 2022 - 2:03:11 PM
Long-term archiving on: : Friday, July 29, 2022 - 7:00:52 PM

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Ce Xiao, Jean Michel Létang, Jean-Yves Buffière. Characterization of internal fatigue cracks in aluminum alloys by simulation of phase contrast tomography. Scientific Reports, Nature Publishing Group, 2022, 12 (1), pp.5981. ⟨10.1038/s41598-022-09811-8⟩. ⟨hal-03638496⟩

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