Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Simulation of Hertzian cone cracks using a phase field description for fracture

 
: Strobl, M.; Morand, L.; Seelig, T.

:

Proceedings in applied mathematics and mechanics. PAMM 16 (2016), No.1, pp.177-178
ISSN: 1617-7061
International Association of Applied Mathematics and Mechanics (GAMM Annual Meeting) <87, 2016, Braunschweig>
English
Journal Article, Conference Paper
Fraunhofer IWM ()
phase field; brittle fracture; cone crack

Abstract
The present contribution focuses on fracture caused by indentation loading on the surface of a brittle solid. Its theoretical prediction is a challenging task due to the fact that crack nucleation is not geometrically induced, but is caused by the stress concentration in the contact near-field. The application of the phase field model requires constitutive assumptions to ensure a tension-compression asymmetric material response and prevent damage in compressed regions. This is achieved at the cost of giving up the variational concept of brittle fracture. We simulate the indentation of a cylindrical flat-ended punch on brittle materials like silicate glass. In order to reduce the numerical effort, we exploit axisymmetric conditions for the finite element formulation. After crack initiation stable propagation of a cone crack can be observed in good agreement with experiments.

: http://publica.fraunhofer.de/documents/N-470470.html