Issue 29

S. de Miranda et alii, Frattura ed Integrità Strutturale, 29 (2014) 293-301; DOI: 10.3221/IGF-ESIS.29.25 300 CASE a E [GPa] a t [mm] p  [MPa] ,2 p D  [MPa] % e CASE a E [GPa] a t [mm] p  [MPa] ,2 p D  [MPa] % e FG 3.5 3 0.06 0.05 15 PGB(2mm) 3.5 3 1.00 0.94 6 FG 3.5 5 0.04 0.03 32 PGB(2mm) 3.5 5 0.87 0.84 4 FG 5.0 3 0.07 0.07 2 PGB(2mm) 5.0 3 1.08 1.00 7 FG 5.0 5 0.05 0.04 20 PGB(2mm) 5.0 5 0.95 0.90 5 FG 6.5 3 0.08 0.09 13 PGB(2mm) 6.5 3 1.12 1.05 7 FG 6.5 5 0.06 0,05 7 PGB(2mm) 6.5 5 1.00 0.95 4 FG 8.0 3 0.09 0.10 18 PGB(2mm) 8.0 3 1.17 1.07 9 FG 8.0 5 0.07 0.07 2 PGB(2mm) 8.0 5 1.06 0.98 7 FG 10.0 3 0.10 0.12 27 PGB(2mm) 10.0 3 1.22 1.11 9 FG 10.0 5 0.08 0.08 6 PGB(2mm) 10.0 5 1.11 1.02 8 PGB(6mm) 3.5 3 0.90 0.84 7 PGT 3.5 3 3.17 3.37 6 PGB(6mm) 3.5 5 0.79 0.74 6 PGT 3.5 5 2.69 3.14 7 PGB(6mm) 5.0 3 0.97 0.90 7 PGT 5.0 3 3.61 3.34 7 PGB(6mm) 5.0 5 0.85 0.80 6 PGT 5.0 5 3.06 3.23 6 PGB(6mm) 6.5 3 1.01 0.95 5 PGT 6.5 3 3.84 3.33 13 PGB(6mm) 6.5 5 0.89 0.85 5 PGT 6.5 5 3.24 3.31 2 PGB(6mm) 8.0 3 1.06 0.99 7 PGT 8.0 3 4.15 3.12 25 PGB(6mm) 8.0 5 0.95 0.88 7 PGT 8.0 5 3.49 3.20 8 PGB(6mm) 10.0 3 1.11 1.04 6 PGT 10.0 3 4.48 3.02 33 PGB(6mm) 10.0 5 1.00 0.93 7 PGT 10.0 5 3.77 3.20 15 FG mean relative error: 14% PGB (2mm) mean relative error: 6% PGB (6mm) mean relative error: 7% PGT mean relative error: 13% Mean relative error: 10% Table 4 : P eak tensile stresses ,2 ,  p p D   and relative errors. A PPENDIX n the following the expressions of the submatrices uu K , uv K , vv K , s vv K , s vv K and the nodal load vectors u P , v P are given: 'T * ' , d uu u t t u u a l u L E A k x        T K N N N N (A. 1) T ' , d 2 t uv u a l v L t k x         K N N (A. 2) 2 'T * ' 'T ' T , , d 4 t vv v t t v v a l v v a t v L t E I k k x           K N N N N N N (A. 3) T , d s s vv v a t v L k x        K N N (A. 4) T T 'T * , ' d s s s s s s s v v v s v a t v v s s v L k k G A x         K N N N N N N s v (A. 5) I