Issue 51

R. Massabò et alii, Frattura ed Integrità Strutturale, 51 (2020) 275-287; DOI: 10.3221/IGF-ESIS.51.22 287 3 3 1 1 3 3 3 1 3 ( ) ( ) 2 23 3 22 22 22 3 1 1 1 ( ) (1) ( 1) (1) 2 23 23 3 2 23 23 ( 1) ( ) ( 1) ( ) 1 1 1 23 23 23 23 ; 1 1 1 1 ˆ ; 1 k k k k k k n n x x b k zS k k S x x k k n k k x z k k i i j j x k i j Q dx M R dx Q G dx G G G G G G                                                1 2 1 ˆ n k k v         (9) Coefficients of the equilibrium equations:   3 3 1 1 3 3 3 1 3 ( ) 2 ( ) 2 22 3 22 3 22 22 3 1 1 2 2 ( ) ( 1) (1) 44 23 22 3 3 23 23 ( 1) ( ) 1 1 23 23 ( ) ( ) 1 1 1 1 , 1 k k k k k k n n x x rS k r k S k k S S x x k k n k x P k k S k S k j j x k j S C C x R dx C C R dx C G R dx C G G K G G                                              1 1 n k    (10)