Journal of Theoretical
and Applied Mechanics
44, 1, pp. 127-137, Warsaw 2006
Influence of notch (tip) radius on fatigue crack growth rate
The paper deals with the problem of fatigue crack propagation from notches in plates made of FeP04 steel and AA356-T6 aluminium alloy. The tests were performed under different stress ranges by keeping the nominal load ratio $ (R=0.1)$ constant. The specimens were weakened by nearly-sharp and blunt two-sided notches. The results of the fatigue tests were then reanalysed in terms of the J-integral range including influence of the notch. It was observed that the blunter notches are, the higher fatigue crack growth rate is.
Keywords: fatigue crack growth; J-integral range; load ratio; notch