Relation between constraint and fatigue crack growth rate

0045003 - ÚFM 2007 RIV US eng C - Conference Paper (international conference)
Hutař, Pavel - Knésl, Zdeněk
Relation between constraint and fatigue crack growth rate.
[Vztah mezi constraitem a rychlostí šíření trhliny.]
Fatigue 2006. Atlanta: Elsevier, 2006, s. 1-9.
[Fatigue 2006. Atlanta (US), 14.05.2006-19.05.2006]
R&D Projects: GA ČR GA101/03/0331; GA ČR GP106/06/P239
Institutional research plan: CEZ:AV0Z20410507
Keywords : constraint * T-stress * high cycle fatigue
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The paper describes an application of constraint based fracture mechanics to the behaviour of fatigue cracks. This work is focused mainly on the area of high cycle fatigue (corresponding to small scale yielding conditions) and different constraint levels are quantified by T-stress value. It is suggested that the fatigue crack propagation rate is controlled by an effective value of the stress intensity factor depending on the nominal value of the stress intensity factor, the yield stress of the material and the T-stress value. It is shown that in some cases the effect of geometry has a significant influence on the fatigue crack propagation rate and on the threshold values.

Práce popisuje vliv constraitu na rychlost šíření únavové trhliny. Na základě porovnání s experimentálními daty je zde uvedena procedura umožňující zahrnutí vlivu constraintu do rychlosti šíření trhliny. Dále je diskutován vliv plasticky indukovaného zavírání trhliny na její rychlost.
Permanent Link: http://hdl.handle.net/11104/0137656