Interrelation between local and global characteristics of cleavage fracture

0444843 - ÚFM 2016 RIV CH eng C - Conference Paper (international conference)
Grishchenko, W. - Kotrechko, S. - Mamedov, S. - Zatsarna, O. - Dlouhý, Ivo
Interrelation between local and global characteristics of cleavage fracture.
Materials Structure and Micromechanics of Fracture VII. Zurich: Trans Tech Publications, 2014 - (Šandera, P.), s. 221-224. Key Engineering Materials, 592-593. ISBN 978-3-03785-934-6. ISSN 1013-9826.
[MSMF 7 - International Conference on Materials Structure and Micromechanics of Fracture /7./. Brno (CZ), 01.07.2013-03.07.2013]
Institutional support: RVO:68081723
Keywords : local stress * fracture * cleavage * embrittlement * strength
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The complexity of calibration procedure for determination of Weibull distribution parameters as well as necessity to perform FEM calculations is one of the shortcomings of conventional versions of Local Approach (LA). This report presents an attempt to ascertain interrelation between local and global characteristics of fracture of pre-cracked and notched specimens of reactor pressure vessel steels, high-strength steels etc. Criterion of cleavage fracture initiation ahead of a crack (notch) is formulated. Dimensionless parameter characterizing the effect of embrittlement by the crack or notch is proposed on the basis of this criterion. Based on the findings of low-temperature tests of pre-cracked or notched specimens of structural steels, it is proved that this parameter may be determined by both local and global characteristics.
Permanent Link: http://hdl.handle.net/11104/0249239