Issue 36

Lj. L. Vulićević et alii, Frattura ed Integrità Strutturale, 36 (2016) 46-54; DOI: 10.3221/IGF-ESIS.36.05

0 1000 2000 3000 4000 5000 6000 7000 8000

Keq [MPa mm 1/2 ]

0

20

40

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step of propagation

and propagation step.

Figure 11 : Relationship between equivalent stress intensity factor K eq

10000

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10

cycles number log N

1

0

20

40

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120

Step

Figure 12 : Obtained relationship between steps and number of cycles.

250

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Crack length a [mm]

50

0

0

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4000

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8000

10000

12000

Number of cycles N

Figure 13 : Relationship between crack length a and number of cycles N using 3D simulation.

C ONCLUSION

ased on the presented results, one can conclude that experimental and numerical results agree well, with some differences which require further investigation. Therefore, the obtained stress intensity factor histories can be used to predict fatigue crack growth rates. B

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