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Rannou, J.
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X-ray microtomography, X-3D-Digital Image Correlation and X-FEM multigrid, a general tool for 3D crack growth law identification
Abstract
ThepresentpaperaimsatshowingthatcouplingtheeXtendedFiniteElementMethodwithX-raymicrotomographyand3Ddigitalimagecorrelationprovidesaverypromisingtooltoassessthe3Dbehaviourofarbitraryshapedcracksandtoperformcomparisonsof“experimental” and simulated” crack shapes during propagation [1].Atfirst,3DX-raymicrotomographyenablesonetoget3Dpicturesofthelocaldensityofsolids. Image and/or volume correlations require a random texture.Exploiting the resolution of the acquisition device available at INSA Lyon, cast-iron samples containing a fatigue crack were selected to provide adequate (random) markers. The graphite nodules provide a random texture in the images (Fig. 1).A testing machine inside the tomograph allows for taking 3D pictures of the specimen during a tensile test.The crack is visible on the deformed picture of the specimen, see Fig. 1: