"Kovov\u00E9 materi\u00E1ly" . . . "Mikromechanismus a lomov\u00E9 charakteristiky k\u0159ehk\u00E9ho po\u0161kozen\u00ED kontru\u010Dn\u00EDch ocel\u00ED" . . "Mikromechanismus a lomov\u00E9 charakteristiky k\u0159ehk\u00E9ho po\u0161kozen\u00ED kontru\u010Dn\u00EDch ocel\u00ED"@cs . "Micromechanism and fracture characteristics of brittle damage in sturctural steels"@en . . "This paper presents a numerical method for prediction of fracture toughness, local cleavage strength and characteristic distance in structural steels at low temperatures. This method, established on a statistical analysis of microstructure and conditionsof brittle fracture initiation, enables to calculate how the integral probability of fracture varies with the stress intensity factor, temperature and deformation, and microstructural parameters of steel. The application of the proposed numerical method on Ni-Cr steel demonstrates very good agreement of predicted temperature dependence of scatter in fracture toughness with experimental results. Mechanism of initiation and propagation of brittle main crack and its stages are identified from the results of fractography analysis. In this paper also a new numerical method calculating the characteristic distance as a function of temperature is suggested. The proposed procedure represents a base for systematic control of microstructure so as to ensure the o"@en . "P(GA106/01/0342)" . . "V pr\u00E1ci je uvedena numerick\u00E1 metoda predikce lomov\u00FDch charakteristik, lomov\u00E9 hou\u017Eevnatosti, lok\u00E1ln\u00ED \u0161t\u011Bpn\u00E9 pevnosti a charakteristick\u00E9 vzd\u00E1lenosti konstruk\u010Dn\u00EDch ocel\u00ED p\u0159i n\u00EDzk\u00FDch teplot\u00E1ch. Tato metoda zalo\u017Een\u00E1 na statistick\u00E9 anal\u00FDze mikrostruktury a podm\u00EDnek iniciace k\u0159ehk\u00E9ho lomov\u00E9ho poru\u0161en\u00ED umo\u017E\u0148uje stanovit, jak se m\u011Bn\u00ED integr\u00E1ln\u00ED pravd\u011Bpodobnost lomu se zm\u011Bnou faktoru intenzity nap\u011Bt\u00ED, teploty deforma\u010Dn\u00EDch vlastnost\u00ED a mikrostrukturn\u00EDch parametr\u016F oceli. Aplikace uveden\u00E9 numerick\u00E9 metody na Ni.-Cr ocel prok\u00E1zala velmi dobrou shodu predikovan\u00E9 teplotn\u00ED z\u00E1vislosti rozptylov\u00E9ho p\u00E1sma lomov\u00E9 hou\u017Eevnatosti s experiment\u00E1ln\u00EDmi v\u00FDsledky. Mechanismus iniciace a \u0161\u00ED\u0159en\u00ED k\u0159ehk\u00E9 magistr\u00E1ln\u00ED trhliny a jeho jednotliv\u00E1 st\u00E1dia byly identifikov\u00E1ny z v\u00FDsledk\u016F fraktografick\u00E9 anal\u00FDzy. V pr\u00E1ci byla navr\u017Eena nov\u00E1 numerick\u00E1 metoda v\u00FDpo\u010Dtu teplotn\u00ED z\u00E1vislosti charakteristick\u00E9 vzd\u00E1lenosti. Navr\u017Een\u00E1 metoda je z\u00E1kladem pro \u0159\u00EDzenou kontrolu mikrostruktury konstruk\u010Dn\u00EDch ocel\u00ED p\u0159i vyv\u00E1\u017Een\u00E9m vztahu mezi jejich pevnostn\u00EDmi ch" . . "4" . "Micromechanism and fracture characteristics of brittle damage in sturctural steels"@en . . "RIV/61989100:27360/01:00001169!RIV/2002/GA0/273602/N" . . "0023-432X" . . . . "263-277" . "0"^^ . "2"^^ . "SK - Slovensk\u00E1 republika" . "0"^^ . "Byczanski, P." . . "15"^^ . . . "Strnadel, Bohum\u00EDr" . "RIV/61989100:27360/01:00001169" . "1"^^ . "Mikromechanismus a lomov\u00E9 charakteristiky k\u0159ehk\u00E9ho po\u0161kozen\u00ED kontru\u010Dn\u00EDch ocel\u00ED" . "Ni-Cr steel, carbides, cleavage fracture, fracture toughness, cleavage strength, characteristic distance"@en . "686987" . . . . "27360" . "39" . "[DE062781B072]" . . "Mikromechanismus a lomov\u00E9 charakteristiky k\u0159ehk\u00E9ho po\u0161kozen\u00ED kontru\u010Dn\u00EDch ocel\u00ED"@cs .