"V pr\u00E1ci je analyzov\u00E1n vliv constraintu na \u0161\u00ED\u0159en\u00ED \u00FAnavov\u00FDch trhlin zejm\u00E9na v oblasti bl\u00EDzk\u00E9 prahov\u00FDm hodnot\u00E1m. Metodika zalo\u017Een\u00E1 na dvouparametrov\u00E9 lomov\u00E9 mechanice je vyu\u017Eita pro zahrnut\u00ED vlivu constraintu do popisu rychlosti \u0161\u00ED\u0159en\u00ED \u00FAnavov\u00FDch trhlin. D\u00E1le je diskutov\u00E1n vliv plasticity a vliv plasticky indukovan\u00E9ho zav\u00EDr\u00E1n\u00ED trhliny na jej\u00ED dal\u0161\u00ED \u0161\u00ED\u0159en\u00ED."@cs . . . . "37" . . "RIV/68081723:_____/06:00044935!RIV07-AV0-68081723" . . "51;57" . "1-2" . . "Effect of constraint on fatigue crack propagation near threshold in medium carbon steel"@en . "Vliv constraintu na prahov\u00E9 hodnoty \u0161\u00ED\u0159en\u00ED trhliny pro oceli se st\u0159edn\u00EDm obsahem uhl\u00EDku"@cs . "Effect of constraint on fatigue crack propagation near threshold in medium carbon steel"@en . "Fatigue crack propagation rate; Constraint; Two-parameter fracture mechanics"@en . . "P(GA101/03/0331), P(GP101/04/P001), Z(AV0Z20410507)" . "473000" . . . . . "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." . . "Computational Materials Science" . . "3"^^ . "Vliv constraintu na prahov\u00E9 hodnoty \u0161\u00ED\u0159en\u00ED trhliny pro oceli se st\u0159edn\u00EDm obsahem uhl\u00EDku"@cs . "Effect of constraint on fatigue crack propagation near threshold in medium carbon steel" . "7"^^ . "3"^^ . "[44B5ADD5ADF6]" . . "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 . "RIV/68081723:_____/06:00044935" . "Huta\u0159, Pavel" . . "Kn\u00E9sl, Zden\u011Bk" . . . "NL - Nizozemsko" . "Seitl, Stanislav" . "0927-0256" . "Effect of constraint on fatigue crack propagation near threshold in medium carbon steel" . . . .