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K ‐DOMINANCE CONDITION IN HYDROGEN ASSISTED CRACKING: THE ROLE OF THE FAR FIELD
Author(s) -
Toribio J.,
Kharin V.
Publication year - 1997
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.1460-2695.1997.tb00304.x
Subject(s) - cracking , hydrogen , materials science , stress field , diffusion , hydrogen embrittlement , stress intensity factor , fracture (geology) , fracture mechanics , composite material , crack closure , mechanics , forensic engineering , thermodynamics , chemistry , physics , engineering , finite element method , corrosion , organic chemistry
— This paper analyses the validity of the fracture mechanics approach to hydrogen assisted cracking in metals on the basis of K ‐dominance over both the stress‐strain state and the accumulation of hydrogen in the fracture process zone. Stress‐strain assisted diffusion of hydrogen is considered as the rate controlling factor of hydrogen assisted cracking under sustained or quasi‐static loading conditions. The discrepancy in the crack tip zone between the far‐field affected diffusion and the asymptotically driven ( K ‐controlled) process is elucidated. The far field (i.e., the stress‐strain field which is not K ‐dominated) is shown to have a minor effect on near‐tip hydrogen diffusion. It can only widen the scatter band of crack growth rates in the near‐threshold portion of the crack growth kinetics curve.