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Cracking and shape deformation of cylindrical cavities during constrained sintering

: Rasp, T.; Jamin, C.; Guillon, O.; Kraft, T.

Postprint urn:nbn:de:0011-n-4452367 (4.2 MByte PDF)
MD5 Fingerprint: 8447eee38e2ae51f993fffefcde64e4e
Created on: 17.03.2019

Journal of the European Ceramic Society 37 (2017), No.8, pp.2907-2917
ISSN: 0955-2219
Deutsche Forschungsgemeinschaft DFG
R 1729/10-2
Deutsche Forschungsgemeinschaft DFG
GU 993/2-2
Journal Article, Electronic Publication
Fraunhofer IWM ()

During constrained sintering of thin films, in which a cylindrical cavity with axis perpendicular to the substrate has been introduced before sintering, cracks emerge that initiate at the cavity surface. By combining experiments with continuum mechanical and particle based simulations, the fundamental causes and effects of this kind of crack formation are identified. A stress analysis performed by finite element (FEM) simulations matches with the cracking behavior observed in experiments. A comparison of discrete element (DEM) results with experiments shows the applicability of this simulation method to describe the effect of cross-sectional stripe dimensions and cavity diameters on the cracking behavior. Moreover, DEM simulations reveal that hair-line cracks in narrow stripe samples formed during pre-sintering manufacturing steps might be a dominant cause for the observed crack damage in such systems.