PSI - Issue 21

Emre Kurt et al. / Procedia Structural Integrity 21 (2019) 21–30

26 6

Author name / StructuralIntegrity Procedia 00 (2019) 000 – 000

In Fig. 5, fatigue crack growth surfaces predicted using the developed 3-D criteria (Eqs. 2-4) are presented from different views. 1

VOLUMES TYPE NUM

APR 5 2019 01:46:52

(a)

(b)

(c)

Y X Z

Fig. 5. Fatigue crack growth surfaces predicted using developed 3-D criteria, a) front view, b) top view, c) isometric view.

Finally, comparison of crack growth lives predicted from the developed criteria and from the reference study (Ren and Guan (2017)) is given in Fig. 6. It is seen from this comparison plot that the crack growth rates predicted by FCPAS using the developed 3-D criteria are in excellent agreement with the reference data.

1.20

1.00

FCPAS Ren and Guan (2017)

0.80

0.60

0.40

0.20 Crack Length, a (mm)

0.00

0.00E+00 7.00E+05 1.40E+06 2.10E+06 2.80E+06 3.50E+06

Number of cycles

Fig. 6. Comparison of crack growth rates predicted from the 3-D developed criteria by FCPAS and from the study by Ren and Guan (2017).

3.2. Multiple semi-elliptical surface cracks in a dog bone shaped specimen As a second application example, the study performed by Shu et al. (2017) is considered. In the reference study, numerical analyses and experimental fatigue crack growth tests are performed for two semi-elliptical surface cracks in a dog bone shaped specimen made of 30CrMn- SiA steel and under tension load. The specimen geometry and initial crack dimensions are given in Fig. 7.