PSI - Issue 18

Fokion Oikonomidis et al. / Procedia Structural Integrity 18 (2019) 142–162 Dr Foki n Oikonomidis / Structural Integrity Procedia 00 (2019) 000 – 000

151

10

  z B

  z B

  z B

2

3

RS axial   

.9 / 3865 328.263 

.9 / 10506

.6 / 14390





  z B

  5 z B

4

.55 / 9467

.85 / 1636





(3) where z is the distance from intrados and B is the diameter of the mooring chain leg. The stress intensity factor of a surface crack in a flat plate is given by the weight function:

i

B a

c

5

  

  

   B f a i

  

  0 i

RS

K

a

, 2

 



i

a

(4)

Where

  5 0 i





i

/ i z B 

is the residual stress distribution given in equation 3 and i f (i = 0 to 5) are geometry functions which are given in Table Q.11 and Table Q.12 in BS 7910 for the deepest point of the flaw and at the intersection of the flaw with the free surface respectively.

Fig. 11. Photographs showing the DHD location during the measurement of residual stresses of a chain link similar to the one examined here.