PSI - Issue 28

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Vinicius Carrillo Beber et al. / Procedia Structural Integrity 28 (2020) 1950–1962 V.C. Beber and M. Brede / Structural Integrity Procedia 00 (2019) 000–000

1954

behaviour (Ward and Sweeney, 2012). 3.2. Substrate

The substrate were made of the aluminium alloy EN AW 6082 (Amco Metall GmbH, Bremen, Germany), which is listed in the “Design and strength assessment of welded structures from aluminium alloys in railway applications” (DVS 1608:2011-09). The properties of the aluminium used as substrate are described in Table 2. The aluminium substrates were bought already with the final dimensions to be used for bonding.

10 15 20 25 30 35 40 45

Elastic Adhesive Structural Adhesive

E = 1944.2 MPa  max = 0.037

E = 18.1 MPa  max = 3.490

Nominal Stress [MPa] 0 5

0

1

2

3

4

Nominal Strain [-]

Figure 2 – Representative stress-strain curves from bulk adhesive specimens: elastic and structural adhesives

Table 1 - Bulk adhesive mechanical properties of the structural and elastic adhesive

Adhesive

E [MPa]

ν [-]

Tensile Strength

Strain at break [%]

Structural

1944

0.38 0.47

41.3

3.7

Elastic

18

8.6

349.0

Table 2 - Mechanical properties of the aluminium substrates

E [GPa]

ν [-]

Yield Stress [MPa]

Tensile Strength

Elongation at break [%]

70

0.33

260

310

6

3.3. Types of joints

Three types of adhesively bonded joints were used for static and fatigue tests, namely:  butt joints with predominantly axial stresses;  scarf joints with a mixture between shear and axial stresses;