Issue 36

V. Petrova et alii, Frattura ed Integrità Strutturale, 36 (2016) 8-26; DOI: 10.3221/IGF-ESIS.36.02

(a)

(b)

(c)

Figure 18 : Stress intensity factors k I

and k II

as function of the inclination angle β=β 2

(60° ≤ β ≤ 120°) and for β 1

=90° for different

distances d between the cracks: (a) for crack 1, (b) for crack 2, (c) for crack 3. Three equal edge cracks.

(a)

(b)

(c)

Figure 19 : Fracture angles ϕ

as functions of the inclination angle β=β 2,3

(60° ≤ β ≤ 120°) and for β 1

=90° for different distances d

between the cracks: (a) for crack 1, (b) for crack 2, (c) for crack 3. Three equal edge cracks.

(a)

(b)

as function of the inclination angle β=β 2,3

(60° ≤ β ≤ 120°) and for β 1

Figure 20 : The non-dimensional critical load p cr

=90° for different

distances d between the cracks: (a) for crack 1, (b) for 3 cracks. Three edge cracks same size.

Some schemes of the direction of cracks propagation for three cracks are shown in Fig. 21 and the results have been mentioned above. The schemes for fracture angles for other crack geometries can be built using the data in Figs. 13, 16 and 19.

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