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FATIGUE CRACK PROPAGATION IN BIAXIAL STRESS FIELDS
Author(s) -
TANAKA K.,
HOSHIDE T.,
YAMADA A.,
TAIRA S.
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.tb01354.x
Subject(s) - materials science , crack closure , stress intensity factor , hydrostatic stress , structural engineering , crack growth resistance curve , crack tip opening displacement , stress (linguistics) , stress concentration , composite material , fractography , mechanics , cruciform , fracture mechanics , paris' law , displacement (psychology) , engineering , physics , finite element method , linguistics , philosophy , psychology , psychotherapist
Biaxial tension‐compression fatigue tests were conducted with cruciform shaped specimens in a closed‐loop servo hydraulic testing machine. The effects of static and cyclic non‐singular stresses acting parallel to the crack plane on the crack growth rate are discussed based on the experimental observations of crack opening behaviour and fractography. Those non‐singular stresses did affect the growth rate significantly under certain conditions. The range of crack‐tip opening displacement was found to be a better parameter in correlating the growth rate than the stress intensity range or its effective range. The rate tended to increase with increasing non‐singular stress which is correlated to the opening displacement range. This tendency was explained by the shift of fracture mechanisms to a more brittle type due to a higher elevation of hydrostatic stress near the crack tip for the case of a larger non‐singular stress term.