Issue 50

N. Alexopoulos et alii, Frattura ed Integrità Strutturale, 50 (2019) 342-353; DOI: 10.3221/IGF-ESIS.50.29

2 hours

reference

reference

500

500

1 hour

stress drop

0.5 hours

6 hours

168 hours

4 hours

400

400

720 hours

8 hours

100 Nominal axial stress σ [MPa] 200 300

2184 hours

12 hours

4200 hours

300

24 hours

200

100

Aluminum alloy 2024- T3 t= 3.20 mm, L direction Exposure at 3.5 % NaCl solution

Aluminum alloy 2024-Τ3 t = 3.2 mm, L direction Exposure at EXCO solution

Nominal axial stress σ [MPa]

0

0

0.00

0.05

0.10

0.15

0.20

0.00

0.05

0.10

0.15

0.20

(a)

(b)

Nominal axial strain ε [-]

Nominal axial strain ε [-]

500

reference

0.10 mm

0.15 mm

400

0.30 mm

100 Nominal axial stress σ [MPa] 200 300 0.50 mm

AA2024-T3 L, t = 3,2 mm with artificial surace-notches

0

0.00

0.05

0.10

0.15

0.20

(c) Figure 3: Typical tensile nominal stress - strain curves of AA2024-T3 after corrosion exposure for different exposure times to (a) EXCO solution, (b) 3.5 wt. % NaCl solution and (c) varying depth of artificial surface notches. Nominal axial strain ε [-]

(a)

(b)

(c)

(d) (f) Figure 4: Typical photographs of AA2024-T3 pre-corroded tensile specimens exposed to the EXCO solution (a)-(c) for 2 h, 4 h and 24 h, respectively and 3.5 wt. % NaCl solution (d)-(f) for 6 h, 168 h and 720 h, respectively. (e)

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