609 Evaluation of Shear Strength and Failure Characteristics of Epoxy Adhesive Joints of Dissimilar Adherends

In this study, the influence of sandblasting process parameters as a surface preparation method on the strength of single-lap adhesive joints of EN AW 2024 T3 aerospace aluminium alloy sheets was determined. Eleven sets of sandblasting parameters were used, which were determined according to a determined experimental plan. The variable factors in the sandblasting process were pressure, nozzle distance, and workpiece displacement speed. The sand jet incidence angle was constant. Garnet 80 E+ was the abrasive material that was used. The joints were made using an epoxy adhesive composition of Epidian 5 epoxy resin and a PAC curing agent. The influence of the surface preparation method on the surface roughness and contact angle to determine the surface free energy was evaluated. The shear strength of the adhesive joints was also determined, which finally allowed the evaluation of the applied surface treatment variants. The obtained results were subjected to statistical analysis, which indicated that the highest shear strength of the adhesive joints was obtained for samples whose surfaces were treated by sandblasting at parameter configurations in which the pressure was 5–6 × 105 Pa; the distance between the nozzle and the sandblasted surface should not be greater than 97 mm, and the speed at which the workpiece moves in relation to the nozzle should not be greater than 75 mm/min.

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On the effect of pulsed laser ablation on shear strength and mode I fracture toughness of Al/epoxy adhesive joints

Journal of Adhesion Science and Technology ◽

10.1080/01694243.2015.1049325 ◽

2015 ◽

Vol 29 (17) ◽

pp. 1820-1830 ◽

Cited By ~ 10

Author(s):

Giovanni Chiodo ◽

Marco Alfano ◽

Stefano Pini ◽

Alessandro Pirondi ◽

Franco Furgiuele ◽

...

Keyword(s):

Fracture Toughness ◽

Shear Strength ◽

Laser Ablation ◽

Pulsed Laser ◽

Pulsed Laser Ablation ◽

Epoxy Adhesive ◽

Adhesive Joints ◽

Mode I ◽

Mode I Fracture ◽

Mode I Fracture Toughness

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Influence of Surface Treatment on Steel Adhesive Joints Strength—Varnish Coats

Materials ◽

10.3390/ma14226938 ◽

2021 ◽

Vol 14 (22) ◽

pp. 6938

Author(s):

Anna Rudawska ◽

Izabela Miturska-Barańska ◽

Elżbieta Doluk

Keyword(s):

Shear Strength ◽

Surface Treatment ◽

Epoxy Adhesive ◽

Adhesive Joints ◽

Steel Sheets ◽

Lower Shear ◽

Cyanoacrylate Adhesive ◽

Strength Tests ◽

The Impact ◽

Iso 25178

The purpose of the paper is to determine the impact of surface treatment on the strength of adhesive joints, made from various steel sheets. Two variants of the surface treatment steel adherends were used: without the varnish coat and with the varnish coat, using three polymer-based varnishes (a simple, a hybrid, and a gel). Two types of the adhesives were used to prepare the adhesive joints: a single-component cyanoacrylate adhesive and a two-component epoxy adhesive. A strength test of the adhesive joints (EN DIN 1465 standard), a coating adhesion test (ASTM D3359-B standard), and surface topography, as well as surface roughness, parameters (PN-EN ISO 11562, PN-EN ISO 4287, and PN-EN ISO 25178 standards) were used. Based on the strength tests, it was observed that the adhesive joints, with the hybrid varnish onto the adherend’s surface, achieved markedly lower shear strength. The best results, in terms of the adhesive joint strength, made using the cyanoacrylate adhesive were achieved for the joints where the adherends were coated with a simple varnish, while in the joints made using the epoxy adhesive, the highest shear strength was achieved by the joints of sheets whose surfaces were coated with the gel varnish.

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