Issue 46

T. Bounini et alii, Frattura ed Integrità Strutturale, 46 (2018) 1-13; DOI: 10.3221/IGF-ESIS.46.01

The following figure shows the true stress-true strain curves that characterize an elasto-plastic behavior of the studied materials.

Figure 2: Details of the dumbbell specimen.

700

600

500

400

300

 v (MPa)

200

100

6082 6082 FSW

0

0,00

0,02

0,04

 v (%)

Figure 3: Tensile behavior of 6082 T6 aluminum alloy with and without welding.

The usual mechanical characteristics of the two materials are given in Tab. 2 below:

E (MPa)

σ e (MPa)

σ max (MPa)

ε y (%)

ε failure (%) 0.029

K (MPa)

Material

n

Al 6082-T6

74000

314

487

0.0046

1351

0.21

Al 6082-T6 FSW

69000

260

391

0.0038

0.019

848

0.19

Table 2: Tensile Mechanical characteristics.

The conventional yield stress in the base material (314MPa) is well above the yield strength in FSW welded specimens (260MPa). Fatigue Test The cracking tests were carried out on CT50 test specimens of thickness 06 mm, in accordance with ASTM-E-647 norm, the dimensions of which are given in Fig. 4. The cracking tests were carried out at the University of Sidi Belabbes, on an INSTRON electrohydraulic machine of capacity 100 KN in static and 50 KN in dynamics.

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