Simulation of short crack propagation using a hybrid boundary element technique |
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| Authors: | Martin Kübbeler Claus-Peter Fritzen Ingmar Roth Hans-Jürgen Christ Ulrich Krupp |
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| Affiliation: | 1. Institut für Mechanik und Regelungstechnik – Mechatronik, Universität Siegen, Germany;2. Institut für Werkstofftechnik, Universität Siegen, Germany;3. Fakultät Ingenieurwissenschaften und Informatik, Fachhochschule Osnabrück, Germany |
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| Abstract: | Service life of cyclically loaded components is often determined by the propagation of short fatigue cracks, which is highly influenced by microstructural features such as grain boundaries. A two-dimensional model to simulate the growth of such stage I-cracks is presented. The crack is discretised by dislocation discontinuity boundary elements and the direct boundary element method is used to mesh the grain boundaries. A superposition procedure couples these different boundary element methods to employ them in one model. Varying elastic properties of the grains are considered and their influence on short crack propagation is studied. A change in crack tip slide displacement determining short crack propagation is observed. (© 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) |
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