PSI - Issue 50

Danila D. Vlasov et al. / Procedia Structural Integrity 50 (2023) 299–306 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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3. Materials, methods and experiments For the experiment, glass fibers reinforced plastic strips of constant length and different widths were prepared. The strips were joined with overlapping (Fig. 7) with different joint lengths (see Table 1.) using 3 types of adhesives: 2 cyanoacrylate-based, hard adhesives and 1 rubber-based, soft adhesive. Adhesives can be divided by exposure time - the first group - "instant" - the joint can be used in a few minutes after gluing, the second group - "traditional" - exposure time of 24 hours. All adhesives showed fundamentally similar results, so the article presents the data on the adhesive with the least amount of "dropping out" experimental values – cyanoacrylate-based "instant" one (see Table 2). Tensile tests were carried out until the specimens fail on the INSTRON electromechanical machine – 100 000 N. All specimens failed in the joining zone.

Fig. 7. Specimen for testing.

Table 1. Specimens geometry. Specimen №

Joint width, b , mm

Joint length, а , mm

Joint area, mm 2

1 2 3 4 5 6 7 8 9

10 15 25 10 15 20 10 15 20

100 150 250 250 375 500 500 750

10

25

50

1000

Table 2. Experimental data.

Shear stress, τ , MPa

Specimen №

Max. load, N

1 2 3 4 5 6 7 8 9

1092 1713 2947 2043 3435 4943 2800 3491

10,92 11,42 11,79

8,17 9,16 9,89 5,60 4,65 0,42

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