PSI - Issue 72

C.F.F. Gomes et al. / Procedia Structural Integrity 72 (2025) 34–42

36

Fig. 1 . Schematic representation of the tubular joints’ geometry.

Table 1. Dimensions of the overlap tubular adhesive joints.

Description

Dimensions [mm]

Overlap length, L O Adherends’ length, L S

10 45

20 50 80 20

40 60

Total length, L T

Outer diameter of inner adherend, d SI Outer diameter of outer adherend, d SE Thickness of inner adherend, t SI Thickness of outer adherend, t SE

24.4

2 2

Adhesive thickness, t A

0.2

2.2. Materials

The adherends for the validation study were made from the aluminum alloy AW 6082-T651, characterized by Campilho et al. (2011) (Fig. 2 ). The results showed a tensile strength of 324.00±0.16 MPa, a Young’s modulus of 70.07±0.83 GPa, a tensile yield strength of 261.67±7.65 MPa, and a tensile fracture strain of 21.70±4.24%.

100 150 200 250 300 350

 [MPa]

Experimental Numerical approximation

0 50

0

0.05

0.1

0.15

0.2

0.25



Fig. 2. Stress-strain ( σ - ε ) curves of the aluminum alloy AW6082-T651. The CZM study that followed used this aluminum alloy and two additional materials. The first one is a Carbon Fiber Reinforced Polymer (CFRP), obtained by hand lay-up of 16 individual plies of SEAL ® Texipreg HS 160 RM prepreg. The CFRP elastic properties were obtained in previous studies (Campilho et al. 2005) (Table 2).

Table 2. Elastic properties of the CFRP (Campilho et al. 2005).

E 1 [MPa] 109000

E 2 [MPa]

E 3 [MPa]

G 12 [MPa]

G 13 [MPa]

G 23 [MPa]

 12

 13

 23

8819

8819

0.342

0.342

0.38

4315

4315

3200

The second additional adherend material is the DIN 55Si7 steel. This high-strength steel aims to prevent plastic deformation of the adherends during testing due to its high elastic limit. This aspect is significant because it enables comparing different adhesives without the interference of adherend plasticization or failure. The properties of this material have been previously estimated (Valente et al. 2019) and are presented in Table 3.