Issue 51

R. Massabò et alii, Frattura ed Integrità Strutturale, 51 (2020) 275-287; DOI: 10.3221/IGF-ESIS.51.22

n

n

3 k

3 k

x

x









2 b

( ) k

22 zS

( ) k

22 22 3 S R dx k









Q

23 3 dx

M

;

(9)





3 k

3 k

1

1

x

x





k

k

1

1

   

   

  

  

  

  





n

k

k

n

1

1

1

1

1

1

3 k

x

1    ( ) k 23  





( 1) k 

2 z

2 k

(1)

(1)

2 ˆ ; 

ˆ





 





v

Q

G

dx

G

G

1

23

3

23

23

( 1) i 

( 1) j 

( ) i G G 23

( ) j G G 23

3 k

x









k

i

j

k

1

1

1

1

23

23

Coefficients of the equilibrium equations:

n

n

3 k

3 k

x

x









rS

( ) k

1 3 ( ) C x R dx  22 3 r k S 22

S

( ) k

k

2

2





C

C

( C R dx )

(10)

S

22

22

3



3 k

3 k

1

x

x





k

k

1

1

2

   

   

   

   

  

  



n

n

k

1

1

1

1





3 k

2

x

1   k







( 1) k 

P

( ) k

k

S

(1)











C

G

22 3 R dx C 3 , S

G

G

1

1

44

23

23

23 ( 1) 

k

j

( ) j G G 23

K



3 k

1

x





k

j

1

1

S

23

287