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A FRACTURE MECHANICS APPROACH TO HIGH‐CYCLE FATIGUE CRACK GROWTH UNDER IN‐PLANE BIAXIAL LOADS
Author(s) -
KITAGAWA H.,
YUUKI R.,
TOHGO K.
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.tb01355.x
Subject(s) - cruciform , materials science , paris' law , stress intensity factor , structural engineering , crack closure , growth rate , composite material , ultimate tensile strength , crack growth resistance curve , phase (matter) , stress (linguistics) , fracture (geology) , stress concentration , fracture mechanics , engineering , mathematics , geometry , linguistics , chemistry , philosophy , organic chemistry
Fatigue crack growth under biaxial tensile load conditions is reported for a structural sheet steel. The new test facility can operate at high frequency (0–40 Hz) thereby permitting real‐time testing required for threshold investigations; specimens are of the cruciform type. It is found that crack growth rate is affected by a cyclic tensile load applied in the direction of growth which decreases as the said load increases. The rate however increases if the biaxial loads are increasingly out of phase. Within the test conditions reported LEFM can be applied to crack growth under biaxial load conditions. The threshold stress intensity range is shown to be a function of load biaxiality, phase difference and stress ratio.