# PSI - Issue 2_A

8

M. Perl, and M. Steiner/ Structural Integrity Procedia 00 (2016) 000–000

M Perl et al. / Procedia Structural Integrity 2 (2016) 3625–3646

3632

Fig. 3. K IA /K 0 at ψ =0° as a function of the number of degrees of freedom for a crack of a/t =0.2, a/c =0.6 in a spherical vessel of R 0 /R i =1.7

Fig. 4 . K IA /K 0 vs. ψ evaluated by J integral and displacement extrapolation for a crack of a/t =0.1, a/c =1.0 prevailing in a spherical vessel of R 0 /R i =1.7.

4. Results and discussion The SIF distributions are presented separately for each of the crack configurations i.e., arrays of radial cracks, arrays of coplanar cracks, and ring cracks. All the SIFs are normalized with respect to K 0 given by:

a Q

K

(1)

0

y

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