PSI - Issue 64

Visal Thay et al. / Procedia Structural Integrity 64 (2024) 925–931 Visal Thay/ Structural Integrity Procedia 00 (2019) 000–000

928 4

150

120.9MPa

Case 0 Case 1 Case 2 Case 3

100

90.1MPa

64.4MPa 51.5MPa

50

30.5MPa 20.5MPa

0

0 Maximum principal stress (MPa)

50 100 150 200 250 300

Length from fixed end (mm)

Fig. 4. Principal stress distribution in adhesive layer of adhesive joints.

Table 2. Analysis result of the principal stress of adhesive joints.

Analytical results

First peak

Second peak

Analytical model

Principal stress (MPa)

Reduction ratio (%)

Principal stress (MPa)

Reduction ratio (%)

Case 0 Case 1 Case 2 Case 3

120.9

0.0

- -

- -

90.1 51.5 64.4

25.5 57.4 46.8

30.5 20.5

74.8 83.0

4. Bending static test

4.1. Specimen preparation and test setup The specimen was consisted of a base steel plate (800×75×25 mm) with a steel patch plate (250×75×19 mm) attached as presented in Fig. 1. For the specimen preparation (Fig. 5), before bonding, the surfaces of the steel base plate and steel patch plate were prepared by the Bristle Blaster (G-TOOL) and cleaned by the acetone, and after bonding the specimens were cured at 40 °C for 24 hours. The thickness of the adhesive was controlled to be approximately 0.4 mm using glass beads. Surface treatment was mainly conducted near critical areas using the grinder and sandpapers.

(a) Surface treatment of Bristle Blaster

(b) Adhesion and end design

(c) Cure 40 °C for 24 hours

Fig. 5. Specimen preparation.