Micro-Raman Study of the Fatigue and Fracture Behaviour of single PA66 Fibres. Comparison with single PET and PP Fibres

Philippe Colomban (1) , José-Martin Herrera-Ramirez (2) , Raphaël Paquin (1) , Alba Marcellan (1, 2) , Anthony R. Bunsell (2)

1 LADIR - Laboratoire de Dynamique Interactions et Réactivité
2 CDM - Centre des Matériaux

The micro/nano structural evolution of PA66, PP, PBO and PET (both drawn and precursor) fibres, before and after tensile loading, fatigue and ultimately, failure has been studied by Raman microspectroscopy using two probes. The Raman analysis has used low wavenumber collective modes at <150 cm-1 as representative of the crystalline and amorphous chains and stretching and bending modes, as representative of the C-C bond local behaviour. Wavenumber and bandwith distribution across fibre/precursors diameters revealed different types of skin/core heterogeneities. The in situ analysis at different strain levels showed that amorphous zones in the fibres accommodate the stress differently. Slight tensile straining is observed for crystalline PA 66 chains, and compression for PP and PET chains. Post mortem analysis of a series of fibres failed in fatigue showed that the amorphous domains were highly stressed during failure and a resulting residual stress could be measured.

Mots clés: Raman; fibre; nanostructure; mechanics; fatigue; tension

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Philippe Colomban, José-Martin Herrera-Ramirez, Raphaël Paquin, Alba Marcellan, Anthony R. Bunsell. Micro-Raman Study of the Fatigue and Fracture Behaviour of single PA66 Fibres. Comparison with single PET and PP Fibres. Engineering Fracture Mechanics, 2006, 73, pp.2463-2475. ⟨hal-00120388⟩