PSI - Issue 13

Valentin Tkachenko et al. / Procedia Structural Integrity 13 (2018) 1396–1401 Author name / Structural Integrity Procedia 00 (2018) 000–000

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(a) (b) Fig. 3. Fracture surface of crack growth test specimen with (a) straight and (b) curvature crack front.

The numerical simulations were performed in the similar way to the case of SIF calculation for straight crack front described in section 2. The values of SIF were calculated along the curvature crack front. After, the crack front was divided into small segments of a given length l =0.03 mm. When the fatigue crack front is divided the SIF values from the numerical solution are assigned to each segment. (a) (b)

(c)

(d)

Fig. 4. Modeling of fatigue crack shape (in red) and experimental data (in blue) at different stages (a) second crack front; (b) four crack front; (c) eight and (d) nine crack front.