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Crack Tip Shielding or Anti-shielding due to Smooth and Discontinuous Material Inhomogeneities |
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| Authors: | N. K. Simha F. D. Fischer O. Kolednik J. Predan G. X. Shan |
| Affiliation: | 1. Department of Orthopaedic Surgery, University of Minnesota, MMC 289, 420 Delaware St. SE, Minneapolis, MN 55455, USA 2. Institute of Mechanics, Montanuniversit?t, Franz-Josef-Strasse 18, A-8700, Leoben, Austria 3. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, A-8700, Leoben, Austria 4. Materials Center Leoben, Franz-Josef-Strasse 13, A-8700, Leoben, Austria 5. Faculty of Mechanical Engineering, University of Maribor, SI-2000, Maribor, Slovenia 6. VOEST Alpine Industrieanlagenbau GmbH&Co, Turmstrasse 44, A-4031, Linz, Austria |
| Abstract: | This paper describes a theoretical model and related computational methods for examining the influence of inhomogeneous material properties on the crack driving force in elastic and elastic-plastic materials. Following the configurational forces approach, the crack tip shielding or anti-shielding due to smooth (e.g. graded layer) and discontinuous (e.g. bimaterial interface) distributions in material properties are derived. Computational post-processing methods are described to evaluate these inhomogeneity effects. The utility of the theoretical model and computational methods is demonstrated by examining a bimaterial interface perpendicular to a crack in elastic and elastic-plastic compact tension specimens. |
| Keywords: | Composite material energy release rate finite element method fracture toughness layered material |
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