About: Effect of constraint on fatigue crack propagation near threshold in medium carbon steel

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	V práci je analyzován vliv constraintu na šíření únavových trhlin zejména v oblasti blízké prahovým hodnotám. Metodika založená na dvouparametrové lomové mechanice je využita pro zahrnutí vlivu constraintu do popisu rychlosti šíření únavových trhlin. Dále je diskutován vliv plasticity a vliv plasticky indukovaného zavírání trhliny na její další šíření. (cs) The influence of constraint caused by different specimen geometry on fatigue crack growth in the threshold region is analyzed and a phenomenological model is proposed to correlate the fatigue crack propagation rate under different constraint levels. The approach is based on an application of two-parameter fracture mechanics and the corresponding calculations are performed according to the finite element method. The constraint level is quantified by the value of T-stress. The fatigue crack propagation rate is then expressed in terms of the stress intensity factor K and T-stress. Plastic zone size is considered as a controlling variable for near threshold fatigue crack behavior and a simple procedure making it possible to estimate the changes of the fatigue crack propagation rate in the threshold region due to different constraint level quantitatively is formulated. It is concluded that experimental values correspond well with those numerically predicted. The influence of constraint caused by different specimen geometry on fatigue crack growth in the threshold region is analyzed and a phenomenological model is proposed to correlate the fatigue crack propagation rate under different constraint levels. The approach is based on an application of two-parameter fracture mechanics and the corresponding calculations are performed according to the finite element method. The constraint level is quantified by the value of T-stress. The fatigue crack propagation rate is then expressed in terms of the stress intensity factor K and T-stress. Plastic zone size is considered as a controlling variable for near threshold fatigue crack behavior and a simple procedure making it possible to estimate the changes of the fatigue crack propagation rate in the threshold region due to different constraint level quantitatively is formulated. It is concluded that experimental values correspond well with those numerically predicted. (en)
Title	Effect of constraint on fatigue crack propagation near threshold in medium carbon steel Effect of constraint on fatigue crack propagation near threshold in medium carbon steel (en) Vliv constraintu na prahové hodnoty šíření trhliny pro oceli se středním obsahem uhlíku (cs)
skos:prefLabel	Effect of constraint on fatigue crack propagation near threshold in medium carbon steel Effect of constraint on fatigue crack propagation near threshold in medium carbon steel (en) Vliv constraintu na prahové hodnoty šíření trhliny pro oceli se středním obsahem uhlíku (cs)
skos:notation	RIV/68081723:_____/06:00044935!RIV07-AV0-68081723
http://linked.open.../vavai/riv/strany	51;57
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA101/03/0331), P(GP101/04/P001), Z(AV0Z20410507)
http://linked.open...iv/cisloPeriodika	1-2
http://linked.open...vai/riv/dodaniDat	2007
http://linked.open...aciTvurceVysledku	Knésl, Zdeněk Seitl, Stanislav Hutař, Pavel
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyziky materiálů AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	473000
http://linked.open...ai/riv/idVysledku	RIV/68081723:_____/06:00044935
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Fatigue crack propagation rate; Constraint; Two-parameter fracture mechanics (en)
http://linked.open.../riv/klicoveSlovo	Constraint Fatigue crack propagation rate Two-parameter fracture mechanics
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[44B5ADD5ADF6]
http://linked.open...i/riv/nazevZdroje	Computational Materials Science
http://linked.open...in/vavai/riv/obor	JL
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	FEM simulations of fatigue crack propagation under complex service conditions The influence of constraint on threshold values of the stress intensity factor
http://linked.open...UplatneniVysledku	2006
http://linked.open...v/svazekPeriodika	37
http://linked.open...iv/tvurceVysledku	Hutař, Pavel Knésl, Zdeněk Seitl, Stanislav
http://linked.open...n/vavai/riv/zamer	Physical properties of advanced materials in relation to their microstructure and processing
issn	0927-0256
number of pages	7 (xsd:int)

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