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National Repository of Grey Literature

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Evaluation of KQ toughness and Kefc fracture toughness of hypoeutectoid steel R7T Holzmann, Miloslav ; Jurášek, L. Interpretation of the characteristic KQ using linear-elastic fracture mechanics coupled with Irwin´s concept of the effective crack length. The effective yield stress Ref as a basic parameter controlling the level of KQ and its scatter. The use of Irwin´s concept of effective crack length for determining fracture toughness Kefc. Validity of Irwin´s concept up to certain ratio of Fmax/FGY. The scatter of the fracture toughness Kefc, i. e. probability distribution of fracture toughness Kefc diagram. This diagram can be used in the case of application of probabilistic fracture mechanics for determining cumulative fracture probability of the given crack. Detailed record

Použití lokálního přístupu při řešení transferability lomově mechanických parametrů Dlouhý, Ivo ; Hadraba, Hynek ; Jurášek, L. In some applications the pre-cracked Charpy specimens (PC) can be, after meeting the validity conditions applied for specification of fracture toughness characteristics corresponding to standard specimens. Typically this is the case of pearlitic steel R7T (used for railway wheelset production) with Lüders’ flow and higher strength properties. It has been found that there is a gap in fracture toughness data of PC specimens between the 60 and 90 MPam1/2 due to plastic hinge in net section of PC specimens. The distribution of maximum principal stress ahead of the crack tip in PC specimen loaded into fully plastic regime was found to be identical with that of reference stress-strain field in plane-strain SSY condition. 3D FEM simulations also shown that there is no constraint loss in PC specimens. Detailed record

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