PSI - Issue 39

Alice Sirico et al. / Procedia Structural Integrity 39 (2022) 494–502 Author name / Structural Integrity Procedia 00 (2019) 000–000

498

5

digital images of the deformed specimen during the test execution with the initial undeformed state. The images obtained from the camera NIKON D750 were processed by means of software Ncorr (Blaber et al. (2016)), developed in MATLAB environment. 3. Results and discussion The performed 3PB tests allowed obtaining the load (P) - CMOD curves (Fig. 3), so as to evaluate both flexural strength σ f and fracture energy G f . By adopting the symbols previously defined in Section 2.3, the flexural strength σ f was determined as:

3 −

S

P

σ =

,

(1)

max

f

(

)

2

2

0.3 b D D

where P max represents the peak load of P - CMOD curve and b is the width of the cross section (equal to 100 mm).

5.0

P [kN]

4.0

P_1 P_2 P_3

3.0

2.0

1.0

CMOD [mm]

0.0

(a)

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

5.0

P [kN]

4.0

V10_1 V10_2 V10_3

3.0

2.0

1.0

CMOD [mm]

0.0

(b)

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1