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THE STATISTICAL TREATMENT OF SMALL SPECIMEN FRACTURE TOUGHNESS DATA IN THE TRANSITION REGION
Author(s) -
Brožová Anna,
Ruščák Martin
Publication year - 1993
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1993.tb00734.x
Subject(s) - weibull distribution , quantile , materials science , charpy impact test , fracture toughness , exponent , toughness , forensic engineering , structural engineering , composite material , mathematics , statistics , engineering , philosophy , linguistics
— The paper deals with the fracture toughness data gained from small Charpy‐COD specimens of CrNiMoV steel in both unirradiated and irradiated states. The new single transition temperature is defined as the quantile of the P ui distribution. The Weibull (2‐ and 3‐parameter) and Neville models are used for the statistical treatment of the data. The lower part of the failure probability distribution can well be described by the models, the upper part, less steep, needs a new approach. The change between these two conditions is considered to be caused by failure of the small scale yielding condition. The effect is more significant for irradiated materials. A new definition of the limit for J max values reflecting the effect of both flow stress and work hardening exponent is suggested.