Issue 57

S. Derouiche et alii, Frattura ed Integrità Strutturale, 57 (2021) 359-372; DOI: 10.3221/IGF-ESIS.57.26

         S

(22)

Figure 4: The two configurations for the energy-release-rate calculation with the stiffness derivative procedure.

Figure 5: An arbitrary body with its material properties in the (x,y) coordinate system and an (x',y') coordinate system inclined with φ from the principal axes with a change of the values of the material properties.

where:

 

        



1

12 0 1 0 1



E E

     

          

  S S S S S S S  11 12

1

13



21

 

(23)

12

22

23

E E

2

2

S S S

1

13

32

33

0

0

 

G

12

366