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Weight functions and stress intensity factors for quarter‐elliptical corner cracks in fastener holes
Author(s) -
CHEN Q.,
WANG X.
Publication year - 2004
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.1460-2695.2004.00796.x
Subject(s) - fastener , weight function , stress intensity factor , stress (linguistics) , structural engineering , nonlinear system , mathematics , fracture (geology) , materials science , mathematical analysis , fracture mechanics , engineering , composite material , physics , linguistics , philosophy , quantum mechanics
Approximate weight functions for a quarter‐elliptical crack in a fastener hole were derived from a general weight function form and two reference stress intensity factors. Closed‐form expressions were obtained for the coefficients of the weight functions. The derived weight functions were validated against numerical data by comparison of stress intensity factors calculated for several nonlinear stress fields. Good agreements were achieved. These derived weight functions are valid for the geometric range of 0.5 ≤ a/c ≤ 1.5 and 0 ≤ a/t ≤ 0.8 and R/t = 0.5; and are given in forms suitable for computer numerical integration. The weight functions appear to be particularly suitable for fatigue crack growth prediction of corner cracks in fastener holes and fracture analysis of such cracks in complex stress fields.