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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