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Proceedings Paper

Tomographic analysis and FE-simulations of MMC-microstructures under load
Author(s): Horst-Artur Crostack; Jens Nellesen; Gottfried Fischer; Siegfried Schmauder; Ulrich Weber; Felix Beckmann
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Paper Abstract

Microstructural changes like micro deformation and damaging due to tensile load precede the macroscopical failure of a component. In order to contribute to the understanding of such processes, the microstructure of tensile test specimens was imaged by microtomography in the course of deformation. The specimens consist of particle reinforced metal matrix composites (the MMCs Cobalt/Diamond and Al/TiN) manufactured on a powder metallurgical route. Tomograms of a volume in the gauge length of the specimens were reconstructed from the projection data acquired at different deformation stages. Both polychromatic radiation of a microfocus X-ray tube and monochromatic synchrotron radiation were used for projection data acquisition. With the help of 3D data processing 3D surface nets were extracted from the tomograms which indicate the particle/matrix interface. These nets which are composed of triangles were afterwards optimized with respect to the shape of the triangles. Using the triangles as seeds a 3D FE-mesh without gaps consisting of tetrahedra was generated. 3D FE-simulations were carried out utilizing both arbitrary and realistic boundary constraints. Realistic conditions were derived from an iterative matching procedure of tomograms. The effect of finite element type (tetrahedron or hexahedron) on the simulated distribution of stresses was analyzed. The appearance and development of plastic zones in the metal matrix depending on externally applied displacements were studied in the simulations. The calculated peak stresses are compared with the loci of cracks found in the tomograms.

Paper Details

Date Published: 7 September 2006
PDF: 12 pages
Proc. SPIE 6318, Developments in X-Ray Tomography V, 63181A (7 September 2006); doi: 10.1117/12.680493
Show Author Affiliations
Horst-Artur Crostack, Univ. of Dortmund (Germany)
Jens Nellesen, RIF e.V. (Germany)
Gottfried Fischer, RIF e.V. (Germany)
Siegfried Schmauder, Univ. of Stuttgart (Germany)
Ulrich Weber, Univ. of Stuttgart (Germany)
Felix Beckmann, GKSS-Research Lab., Geesthacht (Germany)

Published in SPIE Proceedings Vol. 6318:
Developments in X-Ray Tomography V
Ulrich Bonse, Editor(s)

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