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A MODEL RELATING LOW CYCLE FATIGUE PROPERTIES AND MICROSTRUCTURE TO FATIGUE CRACK PROPAGATION RATES
Author(s) -
CHAKRABORTTY SAGHANA B.
Publication year - 1979
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.1460-2695.1979.tb01091.x
Subject(s) - materials science , microstructure , low cycle fatigue , fatigue testing , structural engineering , fracture mechanics , goodman relation , crack closure , vibration fatigue , paris' law , composite material , stress concentration , engineering
— The fatigue crack propagation rate is related to the cyclic flow stress and the cyclic ductility of materials by means of a ductility exhaustion mechanism. The d a /d N vs. Δ K relationship is derived from the assumption that an elemental crack extension occurs when the sum of the fractional fatigue life of an element at various cycles equals unity. A comparison of predicted crack growth curves with those obtained experimentally for representative alloys shows good agreement. The threshold Δ K behavior has been explained in terms of the existence of a threshold plastic strain amplitude.