PSI - Issue 68

Lukas Dominik Geisel et al. / Procedia Structural Integrity 68 (2025) 1273–1279 L. D. Geisel and S. Marzi / Structural Integrity Procedia 00 (2024) 000–000

1278

6

22.5

50

Measurements

Mean curve

20.0

Standard deviation

40

17.5

/ kJ/m²

15.0

/ MPa

OFS

coh

30

7.5 Energy release rate J 10.0 12.5

20

Cohesive traction

5.0

10

Measurements

2.5

Mean curve

Standard deviation

0.0

0

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Crack opening displacement w

Crack opening displacement w

/ mm

/ mm

COD

COD

(a) Curves of all ERR measurements plotted over their respective COD

(b) All resulting traction-separation laws

Fig. 5: All measurements of the ERR, the COD and the TSL

50

4-OSLB (new method)

4-OSLB (Geisel and Marzi (2024))

UODCB (Schrader and Marzi (2023)))

TODCB (Schrader and Marzi (2023))

40

MC-DCB (Loh and Marzi (2019))

/ MPa

coh

30

20

Cohesive traction

10

0

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Crack opening displacement w

/ mm

COD

Fig. 6: Varoious previously obtained cohesive laws for the SikaPower ® 498 adhesive. Shown in black are the results of this study.

Acknowledgements

The authors thank Sabine Wenig (Sika Automotive AG, Switzerland) for supplying the adhesive.

References

Aydin, L., Marzi, S., 2024. Obtaining traction-separation laws of adhesive joints using optical fiber strain measurements - Part A (Mode I). Structural Integrity Procedia . Geisel, L.D., Marzi, S., 2024. A modified single-leg bending test to study mode III fracture of adhesive joints. Engineering Fracture Mechanics 308, 110355. doi: 10.1016/j.engfracmech.2024.110355 . Kididane, I., Ladwig, N., Marzi, S., 2024. Dual-actuator mixed-mode bending tests on structural adhesive joints. Engineering Fracture Mechanics , 110017doi: 10.1016/j.engfracmech.2024.110017 . Ladwig, N., Domladovac, D., Marzi, S., 2022. Fracture testing of adhesive joints in mixed-mode I + III. Procedia Structural Integrity 42, 647–654. doi: 10.1016/j.prostr.2022.12.082 . 23 European Conference on Fracture. Loh, L., Marzi, S., 2018a. A Mixed-Mode Controlled DCB test on adhesive joints loaded in a combination of modes I and III. Procedia Structural Integrity 13, 1318–1323. doi: 10.1016/j.prostr.2018.12.277 . eCF22 - Loading and Environmental e ff ects on Structural Integrity.