Premium
A numerical study on the effect of symmetric crack flank holes on fatigue life extension of a SENT specimen
Author(s) -
Ayatollahi M. R.,
Razavi N.,
Chamani H.R.
Publication year - 2014
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/ffe.12199
Subject(s) - flank , crack closure , materials science , crack growth resistance curve , stress intensity factor , stress concentration , paris' law , parametric statistics , structural engineering , composite material , drilling , crack tip opening displacement , fracture mechanics , metallurgy , mathematics , engineering , anatomy , medicine , statistics
ABSTRACT The crack growth retardation is studied theoretically by drilling two symmetric holes at appropriate locations along the crack flanks. A fatigue crack growth code for two‐dimensional elastic problems is developed to approve the effectiveness of this method. The crack growth retardation was examined using a parametric study both on the arrangements of the flank holes and the diameters of holes. The numerical results reveal that for some cases, the presence of flank holes significantly decreases the stress concentration around the crack tip and its stress intensity factor. The best positions for crack flank holes to provide the highest crack growth retardation are shown to be where the line connecting the two centres of holes passes the crack tip. A larger hole diameter and a closer distance between the flank holes and the crack tip result in lower crack growth rate and higher fatigue life.