Fatigue failure of coated structures

0047135 - ÚFM 2007 SIGLE LV eng A - Abstract
Knésl, Zdeněk - Náhlík, Luboš - Bareš, Pavel
Fatigue failure of coated structures.
[Únavové selhání konstrukcí s povlakem.]
Mechanics of Composite Materials. Riga: Institute of polymer mechanics, University of Latvia, 2006. s. 92-92.
[Mechanics of Composite Materials. 29.05.2006-02.06.2006, Riga]
R&D Projects: GA ČR GP106/04/P084
Institutional research plan: CEZ:AV0Z20410507
Keywords : protective coatings * interface
Subject RIV: JL - Materials Fatigue, Friction Mechanics

This paper describes a study of the behaviour of a fatigue crack growing in one elastic material and penetrating through the interface into a second material. The problem is studied under assumptions of linear elastic fracture mechanics, and the corresponding calculations are performed by the finite-element method. The aim of this study is to quantify the influence of the elastic mismatch of both the materials on the threshold value of a fatigue crack propagating to the in¬terface. Special attention is given to the case of a crack touching the interface. It is shown that the threshold value is strongly influenced by the existence of an interface between the two materials. A tentative procedure suggested in the pa¬per makes it possible to quantify the effect and to determine the threshold value of a fatigue crack growing through the interface as a function of some bi-material parameters.

Práce se zabývá šířením únavových trhlin v tencích povlakových vrstvách.
Permanent Link: http://hdl.handle.net/11104/0138131