"RIV/68081723:_____/06:00047154" . "Experimental fatigue life data in ultra-high-cycle region have been shown to exhibit sometimes \u201Ctwo-stage\u201D S-N curves.These observations have been performed on high strength bearing steels using rotating bending.This effect is generally related to different types of crack initiation. Some authors expressed the opinion that the two-stage S-N curves are related rather to the type of loading than to the material. A direct comparison of S-N curves of bearing steel determined in uniaxial tension-compression and rotating bending was performed. An obvious difference in the S-N curve shape was observed. Continuously increasing number of cycles to fracture with decreasing stress amplitude characterizes the tension-compression S-N data, whereas pronounced two-step curve is characteristic of rotating bending tests.It has been shown that the rotating bending S-N data fit the tension-compression ones when the correction in terms of local stress amplitude at the crack initiation site is applied." . "Bylo prok\u00E1z\u00E1no, \u017Ee experiment\u00E1ln\u00ED data v ultravysokocyklov\u00E9 oblasti n\u011Bkdy vykazuj\u00ED %22dvoustup\u0148ovou%22 S-N k\u0159ivku. V\u011Bt\u0161ina t\u011Bchto pozorov\u00E1n\u00ED byla provedena na lo\u017Eiskov\u00FDch ocel\u00EDch p\u0159i pou\u017Eit\u00ED zkou\u0161ek rota\u010Dn\u00EDm ohybem. Bylo upozorn\u011Bno, \u017Ee tento jev je spojen s r\u016Fzn\u00FDmi typy iniciace trhlin v n\u00EDzkocyklov\u00E9 a ultravysokocyklov\u00E9 oblasti. Byla vyslovena domn\u011Bnka, \u017Ee dvoustup\u0148ov\u00E9 S-N k\u0159ivky jsou spojeny sp\u00ED\u0161e se zp\u016Fsobem nam\u00E1h\u00E1n\u00ED ne\u017E s materi\u00E1lem a typem iniciace trhlin. S c\u00EDlem p\u0159isp\u011Bt k objasn\u011Bn\u00ED probl\u00E9mu bylo provedeno srovn\u00E1n\u00ED S-N k\u0159ivek lo\u017Eiskov\u00E9 oceli stanoven\u00FDch p\u0159i zat\u011B\u017Eov\u00E1n\u00ED v tahu-tlaku a ohybem za rotace. Byl pozorov\u00E1n rozd\u00EDl ve tvaru S-N k\u0159ivek. S-N data stanoven\u00E1 p\u0159i zkou\u0161k\u00E1ch v tahu-tlaku vykazuj\u00ED spojit\u00FD r\u016Fst po\u010Dtu cykl\u016F do lomu s klesaj\u00EDc\u00ED amplitudou nap\u011Bt\u00ED, zat\u00EDm co dvoustup\u0148ov\u00E1 k\u0159ivka je typck\u00E1 pro ohyb za rotace. Bylo uk\u00E1z\u00E1no, \u017Ee data ze zkou\u0161ek v ohybu za rotace splynou s daty v tahu-tlaku, zavede-li se koralace na lok\u00E1ln\u00ED amplitudu nap\u011Bt\u00ED v m\u00EDst\u011B iniciace."@cs . "\u010Cin\u010Dala, M." . "[3F3A925E0707]" . . . "RIV/68081723:_____/06:00047154!RIV07-AV0-68081723" . "Kunz, Ludv\u00EDk" . "1;6" . . "Fracture of nano and engineering materials and structures" . "2006-07-03+02:00"^^ . "6"^^ . . "\u00DAnavov\u00E1 \u017Eivotnost lo\u017Eiskov\u00E9 oceli v ultravysokocyklov\u00E9 oblasti"@cs . . . . . "Fatigue lifetime of bearing steel in ultra-high-cycle region"@en . . . "Experimental fatigue life data in ultra-high-cycle region have been shown to exhibit sometimes \u201Ctwo-stage\u201D S-N curves.These observations have been performed on high strength bearing steels using rotating bending.This effect is generally related to different types of crack initiation. Some authors expressed the opinion that the two-stage S-N curves are related rather to the type of loading than to the material. A direct comparison of S-N curves of bearing steel determined in uniaxial tension-compression and rotating bending was performed. An obvious difference in the S-N curve shape was observed. Continuously increasing number of cycles to fracture with decreasing stress amplitude characterizes the tension-compression S-N data, whereas pronounced two-step curve is characteristic of rotating bending tests.It has been shown that the rotating bending S-N data fit the tension-compression ones when the correction in terms of local stress amplitude at the crack initiation site is applied."@en . "Dordrecht" . "Alexandroupolis" . "Fatigue lifetime of bearing steel in ultra-high-cycle region" . . . "475623" . . "\u00DAnavov\u00E1 \u017Eivotnost lo\u017Eiskov\u00E9 oceli v ultravysokocyklov\u00E9 oblasti"@cs . . "Luk\u00E1\u0161, Petr" . . . "Ultra-high-cycle fatigue; bearing steel; two stage S-N curve"@en . "Fatigue lifetime of bearing steel in ultra-high-cycle region"@en . "Fatigue lifetime of bearing steel in ultra-high-cycle region" . "Z(AV0Z20410507)" . "Springer-Verlag" . "1-4020-4971-4" . "2"^^ . "Nicoletto, G." . "4"^^ . .