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

International audienceThe 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

Augmented and Virtual Reality Simulation in Industry

Simulators have been used for a long time in industry. We identify three categories of use: training, design, and testing. We underline that for these three categories of uses, the two major areas of improvement are a better use of haptic devices but also of artificial intelligence

Pour la poésie

Cet ouvrage confronte des œuvres poétiques contemporaines issues d’aires géographiques diverses, Europe, Québec, Antilles, Algérie et Afrique subsaharienne. La langue française y est pratiquée comme une langue internationale oscillant entre prose et vers, lyrisme et sarcasme. Ainsi peut-on découvrir l’extrême diversité de la poésie de langue française aujourd’hui. En mettant en lumière des poètes parfois mal connus, l’ouvrage atteste la vitalité et la force de résistance de la poésie dans un monde qui, souvent, la marginalise