"1" . "Fracture behaviour and cleavage initiation in hypoeutectoid pearlitic steel"@en . . "cleavage fracture; fracture initiation; pearlitic steel"@en . "Fracture behaviour and cleavage initiation in hypoeutectoid pearlitic steel" . "P\u0159\u00EDsp\u011Bvek je orientov\u00E1n na v\u00FDzkum mikromechanism\u016F \u0161t\u011Bpn\u00E9ho lomu v podeutektoidn\u00ED R7T oceli, b\u011B\u017En\u011B vyu\u017E\u00EDvan\u00E9 pro v\u00FDrobu \u017Eelezni\u010Dn\u00EDch dvojkol\u00ED. Pro anal\u00FDzu lomov\u00E9ho chov\u00E1n\u00ED byla pou\u017Eita standardn\u00ED t\u011Blesa typu Charpy zat\u011B\u017Eovan\u00E1 staticky a dynamicky. V\u00FDpo\u010Dty metodou kone\u010Dn\u00FDch prvk\u016F byly zam\u011B\u0159eny na elastoplastickou anal\u00FDzu lomu t\u011Bchto vrubovan\u00FDch t\u011Bles. Detailn\u00ED fraktografick\u00E1 anal\u00FDza zku\u0161ebn\u00EDch t\u011Bles byla zam\u011B\u0159ena na identifikaci mechanismu nukleace \u0161t\u011Bpen\u00ED a ur\u010Den\u00ED vzd\u00E1lenosti inicia\u010Dn\u00EDho m\u00EDsta od ko\u0159ene vrubu. Byla potvrzena vhodnost t\u0159\u00ED-kriteri\u00E1ln\u00EDho mikromechanick\u00E9ho modelu iniciace \u0161t\u011Bpn\u00E9ho lomu. Nez\u00E1vislost \u0161t\u011Bpn\u00E9ho lomov\u00E9ho nap\u011Bt\u00ED na teplot\u011B potvrdila \u0161t\u011Bpn\u00FD lom kontrolovan\u00FD \u0161\u00ED\u0159en\u00EDm. Pro studovan\u00E1 t\u011Blesa s vrubem bylo potvrzeno, \u017Ee existuje aktivn\u00ED objem pod ko\u0159enem vrubu, ve kter\u00E9m jsou lokalizov\u00E1ny perlitick\u00E9 kolonie spojen\u00E9 s iniciac\u00ED. Iniciace \u0161t\u011Bpn\u00E9ho lomu je tak kontrolov\u00E1na m\u00EDsty le\u017E\u00EDc\u00EDmi v aktivn\u00EDm objemu vymezen\u00FDmi kritick\u00FDmi hodnotami nap\u011Bt\u00ED, deformace a triaxiality."@cs . . "RIV/68081723:_____/07:00306608" . "Dlouh\u00FD, Ivo" . . "P(1QS200410502), P(IAA200410502), Z(AV0Z20410507)" . "International Journal of Fracture" . . "Jur\u00E1\u0161ek, L." . "0376-9429" . "2"^^ . "3"^^ . "Lomov\u00E9 chov\u00E1n\u00ED a \u0161t\u011Bpn\u00E1 iniciace podutektoidn\u00EDch perlitick\u00FDch ocel\u00EDch"@cs . . . . . "The micromechanism of cleavage fracture in hypoeutectoid pearlitic R7T steel, commonly used for producing railway wheels, was investigated. Standard Charpy V-notch specimens were used in order to analyse the fracture at quasistatic and impact loading. Finite element 3D calculations were performed and the elastic-plastic behaviour of notched bars up to the fracture was simulated. Fractographic analysis was carried out in order to investigate the origin of cleavage initiation and its distance from the notch root. Independence of cleavage fracture stress on temperature evidenced the micromechanism of cleavage fracture to be microcrack propagation-controlled. For the investigated blunt-notched bend bars, an active volume exists ahead of the notch root in which pearlite colony-associated initiation is located. The cleavage fracture is thus governed by sites lying in the active volume predetermined by critical values of stress, strain and triaxiality."@en . . "148" . . "The micromechanism of cleavage fracture in hypoeutectoid pearlitic R7T steel, commonly used for producing railway wheels, was investigated. Standard Charpy V-notch specimens were used in order to analyse the fracture at quasistatic and impact loading. Finite element 3D calculations were performed and the elastic-plastic behaviour of notched bars up to the fracture was simulated. Fractographic analysis was carried out in order to investigate the origin of cleavage initiation and its distance from the notch root. Independence of cleavage fracture stress on temperature evidenced the micromechanism of cleavage fracture to be microcrack propagation-controlled. For the investigated blunt-notched bend bars, an active volume exists ahead of the notch root in which pearlite colony-associated initiation is located. The cleavage fracture is thus governed by sites lying in the active volume predetermined by critical values of stress, strain and triaxiality." . "[6AD286CCC920]" . "Fracture behaviour and cleavage initiation in hypoeutectoid pearlitic steel"@en . "Lomov\u00E9 chov\u00E1n\u00ED a \u0161t\u011Bpn\u00E1 iniciace podutektoidn\u00EDch perlitick\u00FDch ocel\u00EDch"@cs . "422479" . . . . . . . "Fracture behaviour and cleavage initiation in hypoeutectoid pearlitic steel" . . "RIV/68081723:_____/07:00306608!RIV08-AV0-68081723" . "Holzmann, Miloslav" . "13;28" . "16"^^ . . "NL - Nizozemsko" . .