Crack Paths 2012

In Figure 9, the F E Aresults of the variation of SIFs around the crack contour for

combined misalignments are shown. Whenthe direction of angular misalignment is 0,

the lifetime to failure decreases regardless of the misalignment conditions. However, the

direction of angular misalignment is π, the lifetime to failure rather increases up to a

certain level of concentric misalignment. These results are because concentric and

angular misalignments affect the distribution of SIFs of the crack contour

simultaneously, so the contribution of two misalignments can be varied. For example,

when the direcion of the angular misalignment is π, the shape of the asymmetric crack

growth under the concentric misalignment is opposite to that under angular

misalignment. As shown in Figure 10, it can be confirmed that the crack growth contour

obtained from F E Aand the experimental result have similar tendency each other.

1.1

1.1

0.000

0.004

0.008

0.012

0.016

0.020

01.34567890

Normalizedconcentricmisalignment,e/R A(0S0/)20).011.1

0.004 A0

01.34567890

0.000

0.008

0.012

0.016

0.020

A(0)0.1

A(S/2)0.1

A(S)0.1

Normalizedconcentricmisalignment,e/R

(a) A0.1

(b) A0.2

01.5678901

A0

A(S0/)20).01.1

0.4

A(S)0.1

0.3

0.000

0.004

0.008

0.012

0.016

0.020

Normalizedconcentricmisalignment,e/R

(c) A0.4

Figure 9. Variation of the normalized time to failure for conbimed misalignments

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