PSI - Issue 61

João C.M. Santos et al. / Procedia Structural Integrity 61 (2024) 79–88 Santos et al. / Structural Integrity Procedia 00 (2019) 000 – 000

87

9

3

3

2.5

2.5

2

2

1.5

1.5

P m [kN]

P m [kN]

1

1

0.5

0.5

0

0

Traction

Compression

Bending

Shear

Traction

Compression

Bending

Shear

a)

b)

A 140-1 AV138 2015 7752

A 140-1 AV138 2015 7752

3

2.5

2

1.5

P m [kN]

1

0.5

0

Traction

Compression

Bending

Shear

c)

A 140-1 AV138 2015 7752

Fig. 10. Summary of P m obtained in butt (a), chamfer 1 (b), and chamfer 2 (c) geometries.

Table 4. Classification of adhesives for the different tests according to the geometric parameter considered.

Geometry

Loading Traction

A 140-1

AV138

2015

7752

Butt

3 2 3 4 4 4 3 4 4 3 2 2

1 1 1 1 1 1 4 3 1 4 1 1

4 3 4 3 3 3 2 2 3 1 3 4

2 4 2 2 2 2 1 1 2 2 4 3

Compression

Bending

Shear

Chamfer 1

Traction

Compression

Bending

Shear

Chamfer 2

Traction

Compression

Bending

Shear

4. Conclusions This work aimed to optimize the strength of an adhesive joint formed between the hull and deck of a boat used in canoeing, and subsequently propose geometric solutions and types of adhesives that could improve the current configuration of the adhesive joint. The CZM technique was initially validated with standard SLJ geometries and three adhesives. The observed predictive capacity was quite satisfactory for the two Araldite ® adhesives, while moderate underpredictions were found for the 7752, although this does not invalidate the method.  xy /  avg and  y /  avg stresses showed stress concentrations at the ends of the adhesive for all loading types. By comparing the different geometries, the butt geometry has smallest peak stresses under a shear loading, the chamfer 1 geometry under tensile and compressive loadings, and the chamfer 2 geometry under bending loadings. Between adhesives, the AV138 had the highest peaks on account of its stiffness. The strength analysis showed that, for the butt geometry, the AV138 maximizes P m . For the chamfer 1 geometry, the 7752 is the best solution, and for the chamfer 2 geometry, the AV138 performs best. In view of all obtained results, increasing the boat strength without significantly increasing production