26 October 2004 Analysis of the material behavior of metal-matrix composites under tension by synchrotron radiation-based microtomography and FE calculations
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Micro-deformation and -damage processes running before the macroscopical failure of a component determine its macroscopically observable behaviour. Such processes in metal matrix composites (MMCs) can be imaged during tensile tests with high resolution microtomography utililising synchrotron radiation. To improve the understanding of the material's behaviour the microstructural changes in tensile experiments were studied by tomography and compared with FE computer simulations. Miniaturised tensile test specimens consisting of the particle reinforced MMC Al/10% TiN were manufactured on a powder metallurgic route. From a sub-volume in the gauge length of a specimen high resolution tomograms were created at different deformation stages deploying monochromatic synchrotron radiation supplied by the wiggler beamline BW2 in HASYLAB at DESY in Hamburg. After segmentation and binarization, wherein to each voxel of the 3D tomogram a phase property like e.g. surrounding air, particle or matrix is assigned, the FE-model of the area of interest was set up: Two and three dimensional micro-tomographical sections of interest were discretized using different element shapes to apply a non-linear finite-element method on the real microstructure. The ductile metal matrix was modelled using von Mises flow theory with isotropic hardening. Displacements computed by iterative matching of the tomograms of different deformation states were applied to the FE-model as boundary conditions. The FE-simulations show the appearance and development of plastic zones in the metal matrix as well as high stress concentrations on particles' surfaces, which are areas of crack initiation as the experiments reveal. In future work, criteria for micro-damaging like particle or matrix cracking and delamination can be derived from the comparison of the real with the computer experiments.
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Horst-Artur Crostack, Horst-Artur Crostack, Jens Nellesen, Jens Nellesen, Heribert Blum, Heribert Blum, Thomas Rauscher, Thomas Rauscher, Felix Beckmann, Felix Beckmann, Gottfried Fischer, Gottfried Fischer, } "Analysis of the material behavior of metal-matrix composites under tension by synchrotron radiation-based microtomography and FE calculations", Proc. SPIE 5535, Developments in X-Ray Tomography IV, (26 October 2004); doi: 10.1117/12.559598; https://doi.org/10.1117/12.559598

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