Fatigue resistance of polyamide-6 and polyamide-6/clay nanocomposite

摘要

Axial fatigue tests were carried out on polyamide6/clay nanocomposite and non-filled polyamide-6 (PA6). The results indicate that for these materials the evolution of the strain amplitude is better compared at the same maximum cyclic stress, while the accumulated strain at fracture is better compared at the same strain amplitude. The evolution of the accumulated volume variation suggests a localization of the deformation early in the fatigue process. The nanocomposite and the non-filled matrix showed similar fatigue lifetimes in the mechanically dominated fatigue regime. However, microscopic observations indicate changes in the fatigue fracture mechanisms.