SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 22: Mechanical Properties and Alloy Design: Porous and Nanostructured Materials

MM 22.2: Vortrag

Dienstag, 28. März 2023, 14:30–14:45, SCH A 118

Comparing structural response of filled and porous 3D Titanium network structures by application of nanotomography and graph theory — •Stefan A. Berger1, Markus Ziehmer1, and Jürgen Markmann1,21Helmholtz Zentrum Hereon — 2Technische Unoversität Hamburg

Recently, refinements of the classical Gibson-Ashby relation have been invoked to extend its applicability to the description of the mechanical properties of bicontinuous, nanoporous metals. In particular, the network connectivity has been identified as a crucial parameter that needs to be taken under consideration. So far, global parameters like connectivity or genus (density) have been employed, However, these do not uniquely identify the underlying microstructure. This can be achieved by making use of graph theoretical aspects, as demonstrated in Ziehmer et al[1]. In this work, we have investigated the changes in the network structures of porous Titanium and Ti-Mg composites, fabricated by Liquid Metal Dealloying, during compression tests in a x-ray nanotomograph. The reconstructed sample volumes were simplified by skeletonization, the resulting skeletons transferred into a weighted graph representation, and further decomposed into the constituent rings that built the network. This approach allowed for a statistical description of the behavior of the ring elements under load. One major result is that the essential part of deformation is carried by larger rings. [1] M. Ziehmer, E. T. Lilleodden, Acta Materialia 199 (2020).

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