Dynamic adhesion of polyamide 6,6 cord/rubber composites in H-pull tests: Fatigue evolution, life prediction and methodology evaluation

The influence of fatigue on adhesion of cord/rubber composites was investigated through H-pull tests. Fatigue was found to promote sulfur diffusion from rubber to RFL and induce modulus homogenizing. Higher frequency caused decrease in fatigue life due to self-heating, but the effect was negligible under low displacement amplitude. Longer fatigue life was achieved at higher R ratio, but an exceptional increase in fatigue life was found at the highest R ratio. A universal CLD model was established for predicting fatigue life. Results of model verification revealed a critical R ratio, above which H-pull test no longer accurately evaluated dynamic adhesion.

Automated summary

The influence of fatigue on the adhesion of cord/rubber composites was investigated using H-pull tests. Fatigue was found to enhance the diffusion of sulfur from rubber to RFL and lead to a homogenization of modulus. Higher frequencies resulted in a decrease in fatigue life due to self-heating, but this effect was negligible at low displacement amplitudes. Longer fatigue life was achieved at higher R ratios, with an exceptional increase observed at the highest R ratio. A universal CLD model was developed to predict fatigue life, and it was found that there exists a critical R ratio beyond which H-pull tests no longer accurately evaluate dynamic adhesion.