PSI - Issue 16

Cristian Alejandro de León Gómez et al. / Procedia Structural Integrity 16 (2019) 265–272 Cristian Alejandro de León Gómez et al. / Structural Integrity Procedia 00 (2019) 000 – 000

268

4

b) Case ІІ

a) Case І

c) Case ІІІ

d) Case ІV

f)

Case VI

e)

Case V

Fig. 3. The models of the investigated plate with such existing crack like defects: (a) extension of the plate with through-thickness centred crack; (b) extension of the plate with extended surface crack; (c) extension of the plate with two extended surface cracks; (d) extension of the plate with semielliptical surface crack; (e) extension of the plate with quarter elliptical corner crack; (f) extension of the plate with embedded elliptical crack (centred).

4. Analytical relations

Model No. 1. For determination of the SIF K 1 in case, described in Fig. 3a, relation from Tada et al. (2013) was used

2

4

t a

t a

  

 

  

 1 0,025

     0,06

K

a



 

.

(1)

I

t a

    2

  

cos

Model No. 2. Relations for determination of SIF in the case, presented in Fig. 3b, have the form as shown by Merkblatt DVS 2401 (1982):

K Y a   I ,

(2)

where