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Published in:
2006 | OriginalPaper | Chapter
Short Crack Equations to Predict Stress Gradient Effects in Fatigue
Authors : M. A. Meggiolaro, A. C. O. Miranda, J. T. P. Castro, J. L. F. Freire
Published in: Fracture of Nano and Engineering Materials and Structures
Publisher: Springer Netherlands
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It is well known that the notch sensitivity factor
q
can be associated with the presence of nonpropagating cracks. Such cracks are present when the nominal stress range Δ
σ
n
is between Δ
σ
0
/
K
t
and
Δ
σ
0
/
K
f
, where
Δ
σ
0
is the fatigue limit,
K
t
is the geometric and
K
f
the fatigue stress concentration factors of the notch. Therefore, in principle it is possible to obtain expressions for
q
if the propagation behaviour of small cracks emanating from notches is known.