Micro- versus macro- modelling of creep damage
Krzysztof Nowak
Cracow University of Technology, ul. Warszawska 24, 31-155 Krakow, Poland.
DOI:
https://doi.org/10.7494/cmms.2009.2.0238
Abstract:
In the present paper the continuous approach to model brittle-ductile transition in creep failure phenomenon is replaced by Cellular Automata (CA) model. This allows to back-up this complex phenomenon by relating it to microstructural changes. In previous author’s work the technique of CA has been developed for polycrystalline material structure modelling and brittle failure initiation. The same methodology is used in the present paper, where both ductile and brittle processes are of equal importance. The Hoff theory of ductile failure is implemented in Abaqus package and coupled with CA model of brittle failure. Thus, the proposed description falls into category of Cellular Automata Finite Element (CAFE) methodology applied successfully in metallurgy. Concurrent running of both models yields effectively transition points on log-log diagram of time to failure. The results of above descriptions are compared with experimental observations reported in literature.
Cite as:
Nowak, K. (2009). Micro- versus macro- modelling of creep damage. Computer Methods in Materials Science, 9(2), 249 – 255. https://doi.org/10.7494/cmms.2009.2.0238
Article (PDF):
Keywords:
Cellular Automata, Creep fracture, Damage mechanics, CAFE
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