Issue 44

M. Ciavarella et alii, Frattura ed Integrità Strutturale, 44 (2018) 49-63; DOI: 10.3221/IGF-ESIS.44.05

   

    

 a for a a a S

S *

 1 ,     

 

K

(25)

0

S

S *

 K for a a  ,     

t



e

 R

K IC



 R

K th



e

K

t



e

K

t

10 3 10 4 10 5 10 6 10 7 N

a

a *

a

a s *

s

0

0



e

 R

K IC

 R



e

K

t



K th



e

K

t

10 3 10 4 10 5 10 6 10 7 N

a= 0

a = * a s *

a

s

0

Figure 6 : The interpolation procedure: example case (a) FK>FR and Kt< FK/FR and case (b) FK=FR and Kt>FK/FR=1.



e

 R  e

a

K IC





K th

R

K

t



e

K

t

10 3 10 4 10 5 10 6 10 7 N

a

a

0 s a *

a s *

0

k

a

a

0 s a *

a s *

0

Figure 7 : The generalized Wohler slope as it results from an example interpolation procedure. Case (c) FK>FR but Kt>FK/FR.

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