Initiation of stage i fatigue cracks – experiments and models

0450281 - ÚFM 2016 RIV NL eng C - Konferenční příspěvek (zahraniční konf.)
Polák, Jaroslav - Man, Jiří
Initiation of stage i fatigue cracks – experiments and models.
International Conference on Material and Component Performance under Variable Amplitude Loading. Vol. C. Amsterdam: Elsevier Ltd, 2015 - (Papuga, J.; Ružička, M.), s. 386-394. Procedia Engineering, 101. ISSN 1877-7058.
[VAL 2015 - International Conference on Material and Component Performance under Variable Amplitude Loading. Praha (CZ), 23.03.2015-26.03.2015]
Grant CEP: GA ČR(CZ) GA13-23652S
Institucionální podpora: RVO:68081723
Klíčová slova: crack initiation * persistent slip band * point defects * extrusions * intrusions
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

Early fatigue damage has been studied in a number of model and structural polycrystalline materials using modern experimental techniques. Early initiation of fatigue cracks was found to be related to the localization of the cyclic plastic strain into persistent slip bands during cyclic loading. Internal dislocation structure of the persistent slip bands and also the evolution of the surface relief as surface persistent slip markings are documented. The model of the surface relief formation describing the formation of extrusions and intrusions is briefly described. The intrusions representing sharp surface crack-like defects play the principal role in the initiation of fatigue cracks.
Trvalý link: http://hdl.handle.net/11104/0252149