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Viscoelastic characterization; how to fill experimental gap between solid and liquid techniques

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Résumé

Viscoelastic behaviors of polymers from liquid to solid state are investigated with techniques such as dynamic mechanical analysis (DMA) and rheometry. The time-temperature superposition principle permits to build master curves. WLF law can then be identified and implemented in numerical softwares to predict thermomechanical behaviors. Polycarbonate (PC) with a glass transition (Tg) around 150°C is tricky to characterize. DMA is limited as the rigidity drops around Tg and rheometry is delicate as the fluidity is not sufficient under Tg + 40°C. Data are obtained with DMA (tensile loading) for T ≤ Tg and with rheometry (shear loading) for T ≥ Tg +40°C. The aim is to fit them to obtain a master curve and identify a thermo mechanical behavior. The goal is to propose a new procedure combining two experimental techniques totally different and push the limit of their relevance domain.
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Dates et versions

hal-01113524 , version 1 (05-02-2015)

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  • HAL Id : hal-01113524 , version 1

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Coraly Cuminatto, Jean-Luc Bouvard, Rudy Valette, Michel Vincent, Noëlle Billon. Viscoelastic characterization; how to fill experimental gap between solid and liquid techniques. ICEM16 - International Conference on Experimental Mechanics, Jul 2014, Cambridge, United Kingdom. ⟨hal-01113524⟩
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