Propagation of fatigue crack through a bimaterial interface

0047127 - ÚFM 2007 SIGLE AT eng A - Abstrakt
Knésl, Zdeněk - Náhlík, Luboš - Bareš, Pavel
Propagation of fatigue crack through a bimaterial interface.
[Šíření únavové trhliny přes rozhraní dvou materiálů.]
17th Colloquium on Fundamentals Fatigue Mechanisms. Vídeň: Institute of materials physics, University of Vienna, 2006. s. 10.
[Colloquium on Fundamentals Fatigue Mechanisms /17./. 23.03.2006-24.03.2006, Vídeň]
Grant CEP: GA ČR GP106/04/P084
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: bimaterial interface * fatigue crack
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

The contribution describes a study of the behavior of a fatigue crack growing in one elastic material and penetrating through the interface into a second material. The study aims especially to quantify the influence of the interface on the rate and threshold value of a fatigue crack propagating perpendicularly to the interface. It is suggested that the controlling variable for the propagation of the fatigue crack is the effective value of the stress intensity factor range, Keff , calculated by using the equality of the sizes of the plastic zones in the homogeneous and bi-material bodies. It is shown that the fatigue crack propagation rate and the corresponding threshold value are strongly influenced by the existence of an interface between two materials. A tentative procedure suggested in the paper makes it possible to quantify the effect and determine the dependence of the threshold value of a fatigue crack growing through the interface on the bi-material parameters.

Šíření únavové trhliny přes rozhraní dvou materiálů, stanovení efektivních hodnot součinitele intenzity napětí při šíření přes bi-materiálové rozhraní.
Trvalý link: http://hdl.handle.net/11104/0138127