from the crack. The normal stresses ahead of the transverse crack-tip for tensile and
bending cases are shown in Figure 3-4.
06
05
04
03
S05
02
(b)
15
0 0005 0001 00015 0002 0 00005 0001 00015 0002
Distance from a crack tip r, (m) Distance from a crack tip, r (m)
Figure 3-4. Stress distribution under (a) tensile loads; (b) bending loads.
A logarithmic plot of the normal stresses as a function of distance from the crack
tip is used to determine the singularity in the FE model. The crack tip stress field is
assumed to be of the form r= Ki-r where -1