Issue 51

G. Ramaglia et alii, Frattura ed Integrità Strutturale, 51 (2020) 288-312; DOI: 10.3221/IGF-ESIS.51.23

ID specimen b [mm] d [mm] h [mm] Type of fiber [-] n l

[-] t eq

[mm] f mc

[MPa] f m0

[MPa] f mc

/f mc0 1.129 1.402 2.106 3.314 1.398 1.981 2.874 3.717 1.789 2.600 3.665 1.899 1.932 2.868

[-]

S53 S54 S55 S56 S57 S58 S59 S60 S61 S62 S63 S64 S65 S66

115 115 115 115 115 115 115 115

115 115 115 115 115 115 115 115 115 115 115 115 115 115 0.44 0.44 0.44 0.44 0.53 0.53 0.53 0.53 0.37 0.37 0.37 0.25 0.25 0.25 k eff [-]

340 340 340 340 340 340 340 340 340 340 340 340 340 340

Carbon Carbon Carbon Carbon Carbon Carbon Glass

1 2 3 5 1 2 3 5 2 3 5 2 3 5

0.117 0.234 0.351 0.750 0.117 0.234 0.351 0.750 0.234 0.351 0.750 0.234 0.351 0.750

13.63 16.92 25.42 40.00 16.87 23.91 34.69 44.87 11.90 17.29 24.37 11.79 12.00 17.81

12.07 12.07 12.07 12.07 12.07 12.07 12.07 12.07

Glass

172.5 172.5 172.5

Carbon Carbon

6.65 6.65 6.65 6.21 6.21 6.21

Glass

230 230 230

Carbon Carbon

Glass

Table 13.B : Geometrical characteristics and experimental results [39].

f l,(eq.13) [MPa]

f l,eff,(eq.13) [MPa]

(f l,eff

/ f m0

), (eq.13)

f l, (eq.18) [MPa]

f l,eff, (eq.18) [MPa]

(f l,eff

/ f m0

), (eq.18)

ID specimen

[MPa] 0.256 0.520 0.780 0.952 0.314 0.629 0.943 1.152 0.526 0.789 0.963 0.285 0.428 0.522

[MPa] 0.256 0.520 0.780 0.952 0.314 0.629 0.943 1.152 0.657 0.986 1.204 0.428 0.642

S53 S54 S55 S56 S57 S58 S59 S60 S61 S62 S63 S64 S65 S66

7.02

3.09 6.28 9.41

7.02

3.09 6.28 9.41

14.24 21.37 26.09 14.24 21.37 26.09 7.12

14.24 21.37 26.09 14.24 21.37 26.09 11.87 17.80 21.74 10.68 16.02 19.57 7.12

11.49

11.49

3.80 7.59

3.80 7.59

11.39 13.90

11.39 13.90

9.50

3.50 5.25 6.41 1.77 2.66 3.24

4.37 6.56 8.01 2.66 3.98 4.87

14.24 17.39

7.12

10.68 13.04

0.783 Table 14.B : Effective confining stress calculated according to Eqn. (13) and (18) for the experimental program, [39].

311