Journal article
On the application of cohesive crack modeling in cementitious materials
Cohesive crack models-in particular the Fictitious Crack Model - are applied routinely in the analysis of crack propagation in concrete and mortar. Bridged crack models-where cohesive stresses are assumed to exist together with a stress singularity at the crack tip-on the other hand, are used typically for multi scale problems such as crack propagation in fiber reinforced composites.
Mortar and concrete, however, are multi-scale materials and the question naturally arises, if bridged crack models in fact are more suitable for concrete and mortar as well? In trying to answer this question a model for a centrally cracked sheet is established applying semi-analytical, bridged and fictitious crack modeling.
The semi-analytical crack model is compared with a FEM analysis and it is demonstrated, that the standard fictitious crack implementation in FEM packages (in this case DIANA) provides a good approximation. Further, a quantitative condition is established indicating when a bridged crack model can be approximated with a cohesive crack model with smooth crack closure in terms of the ratio between the energy dissipation associated with the crack tip and the process zone.
Language: | English |
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Publisher: | Springer Netherlands |
Year: | 2007 |
Pages: | 365-374 |
ISSN: | 18716873 and 13595997 |
Types: | Journal article |
DOI: | 10.1617/s11527-006-9179-8 |
ORCIDs: | Stang, Henrik , Olesen, John Forbes and Poulsen, Peter Noe |