Crack Paths 2006
In Figs. 6 and 7 show fatigue crack growth rate da/dN versus 'J integral range for mode
I, mode II and mixed mode I+II. In the elastic-plastic range, stresses and strains were
calculated by means of the finite element program FRANC2D.
d
1E-765
-5 -71-60 110
FeP04S T E E L 1- ModeI2-M3o-dMeoIdI eI+II M Mixed mo I+II =45° 123-exp.
4-ModeI
4-exp.,Eq.(3)
/yc c l)e
(m
a /d N
-8
1E-8
10 -3
10 -2
10 -1
1E-3
1E-2
0.1
1
J (MPa·m) '
Figure 6. Comparison of experimental results for mixed modeI+II and M = 45q
d
1E-8765
M Mixed modeI+II =60° 123-exp.
3-ModeI+II
10-4
-58 -71-60 110
10-1 FeP04S T E E L
ModeI
10-3
10-2
4-ModeI
4-exp.,Eq.(3)
c y c l)e
(m /
a /d N
2-ModeII
1E-4
1E-3
1E-2
0.1
1
J (MPa·m) '
Figure 7. Comparison of experimental results for mixed modeI+II and M = 60q
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