A model for short crack propagation in polycrystalline materials |
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| Authors: | R. Lillbacka E. Johnson |
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| Affiliation: | a SP Swedish National Testing and Research Institute, P.O. Box 857, SE-501 15 Borås, Sweden
b Department of Applied Mechanics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden |
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| Abstract: | A model for microstructurally short crack propagation in a grain structure of a polycrystalline material is developed. The crack propagation model is based on a crystal plasticity model and a microstructurally short crack propagation model in the spirit of the model by Navarro and de los Rios [A model for short fatigue crack propagation with an interpretation of the short-long crack transition. Fatigue Fract Eng Mater Struct 1987;10:169-86]. Numerical examples, where the combined crystal plasticity and crack propagation model is implemented in a model of a microstructure representing a duplex stainless steel, concludes the paper. Results showing how the misorientation of the crack- and slip-directions between two adjacent austenitic grains influences the crack propagation rate, as the crack propagates across their common grain boundary, are given. |
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| Keywords: | Fatigue Short crack propagation Crystal plasticity Finite element method |
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