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A COMPARISON OF THE STRAIN INTENSITY AND CYCLIC J APPROACHES TO CRACK GROWTH
Author(s) -
STARKEY M. S.,
SKELTON R. P.
Publication year - 1982
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.1460-2695.1982.tb01242.x
Subject(s) - materials science , stress intensity factor , strain (injury) , paris' law , hysteresis , austenite , crack closure , intensity (physics) , structural engineering , cyclic stress , fracture (geology) , fracture mechanics , composite material , metallurgy , mechanics , engineering , condensed matter physics , physics , microstructure , medicine , quantum mechanics
Two parameters describing the growth of fatigue cracks are compared. They are the cyclic J integral Δ J and the strain intensity expressed as an equivalent stress intensity Δ K eq‐ . By referring to cyclic stress‐strain data obtained from hysteresis loops in high strength ferritic steels at room temperature and austenitic and ferritic steels at elevated temperature it is shown that: (i) for short cracks the parameters are simply related and (ii) both parameters adequately link fatigue crack growth rates observed in the separate high strain fatigue (HSF) and linear elastic fracture mechanics (LEFM) regimes. Correction factors for thumbnail cracks and the conditions under which the relations need further modification are discussed.