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A modified normalization method for determining fracture toughness of steel
Author(s) -
Gao Hui,
Wang Weigang,
Wang Yanlin,
Zhang Bohua,
Li ChunQing
Publication year - 2021
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/ffe.13380
Subject(s) - exponent , materials science , normalization (sociology) , strain hardening exponent , fracture toughness , hardening (computing) , toughness , composite material , yield (engineering) , structural engineering , engineering , philosophy , linguistics , layer (electronics) , sociology , anthropology
Normalization method (NM) is a practical method for determining the J – R curves and fracture toughness of steels. There is some concern, however, about the performance of this method on steels with small strain hardening exponent and yield strength owing mainly to the assumption of infinite strain hardening exponent. This paper intends to analytically modify the NM by removing this assumption and incorporating the strain hardening in calculating the blunting corrected crack length. This modification enables the NM to be applied to steels with small strain hardening exponent and yield strength. Experiments are undertaken to verify the modified NM (CNM). A comparison of fracture toughness determined by CNM with that by the unloading compliance method and NM corroborates the improved accuracy of the developed CNM. The paper concludes that the developed CNM overcomes the deficiency of the NM for steels with small strain hardening exponent and yield strength.