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Stress intensity factors for surface fatigue crack in a round bar under cyclic axial loading
Author(s) -
YANG F. P.,
KUANG Z. B.
Publication year - 2007
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.1460-2695.2007.01141.x
Subject(s) - crack closure , materials science , bar (unit) , stress intensity factor , structural engineering , paris' law , crack growth resistance curve , stress concentration , compact tension specimen , tension (geology) , crack tip opening displacement , enhanced data rates for gsm evolution , surface (topology) , finite element method , composite material , fatigue testing , fracture mechanics , geometry , mathematics , engineering , geology , ultimate tensile strength , telecommunications , oceanography
In this paper, the surface fatigue crack growth shape for an initial straight‐fronted edge crack in an elastic bar of circular cross‐section is determined through experiments under pure fatigue axial loading. Three different initial notch depths are discussed. The relations of the aspect ratio ( b/c ) and relative crack depth ( b/D ) are obtained, and it is shown that there is a great difference in the growth of cracks with different initial front shapes and crack depths. Further, using the three‐dimensional finite element method, the stress intensity factors (SIFs) are determined under remote uniform tension loading. Since the relationship of b/c and b/D changes during the fatigue crack growth, the SIFs are determined for different surface crack configurations.