[Kovove materialy - Metallic materials]
    Mon - January 25, 2021 - 15:58 No. of hits : 1227868 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 40 (2002), Issue 4

Micromechanical aspects of crack-length effect on fracture toughness and transition behaviour in steels (in Czech)
vol. 40 (2002), no. 4, pp. 254 - 267

Cast C-Mn steel predetermined for container casks of spent nuclear fuel has been tested extensively from the point of view of resistance against brittle fracture. For the fracture toughness evaluation the three-point bend specimens with different crack length (varying a/W ≈ 0.5; 0.2; 0.1) and with the same ligament below the crack tip have been used. Shift of transition regions and temperatures up to lower temperatures with lower crack length values has been determined. Higher average values of fracture toughness and higher scatter in fracture toughness values were obtained when testing specimens at the same temperature. Stress distributions below crack tip have been calculated by finite element method (ABAQUS code) for each specimen geometry separately. Modification has been introduced into calculation taking into account specific material behaviour. The J-Q curve has been obtained from the experimental data set tested at temperature -100 °C.

Key words
fracture toughness, transition behaviour, crack tip constraint, ferritic steel, brittle fracture initiation

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.

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