Fracture Mechanics in Fatigue Analysis. Mods for Factor “K”. The stress intensity factor K: a : the crack width and geometrical correction factor.
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Mods for Factor “K”
The stress intensity factor K:
a: the crack width and geometrical correction factor.
F: the product of a couple of factors (back crack shape factors, front face factor, finite thickness factor, finite width factor and stress gradient factor)
Kmaxand Kminare the maximum and minimum values of the stress intensity factor, at the
upper and lower limit stresses during a cyclic loading.
Plastic Zone Characterized with K
Semi-Crack Lenght- Number of Cycles
m: experimental constant
m= 3 for steel
m=3~4 for aluminum alloy
Fracture Mechanics Based Design
War ship: S.S. Schenectady
Offshore platform: Alexander Kielland
Aircraft : De Havilland Comet