A formulation of the cooperative model for the yield stress of amorphous polymers for a wide range of strain rates and temperatures

By Julien Richeton, Saïd Ahzi, L. Daridon, Y. Rémond. 2005

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Influence of temperature and strain rate on the mechanical behavior of three amorphous polymers: Characterization and modeling of the compressive yield stress (2006, methodology): “For the cooperative model, we have previously shown that the horizontal and vertical shifts can be expressed as (Richeton et al., 2005): where D H b and r i (0) are the two adjusting parameters to get the most suitable master curve.”
A thermo-mechanically-coupled large-deformation theory for amorphous polymers in a temperature range which spans their glass transition (2010, methodology): “(4.30) Finally, guided by the literature (e.g., Eyring, 1936; Fotheringham and Cherry, 1976, 1978; Povolo and Hermida, 1995, 1996; Richeton et al., 2005, 2006, 2007) and our own recent paper Ames et al. (2009), for the flow function f in (4.30) we choose a thermally-activated relation in the…”
Modeling and validation of the large deformation inelastic response of amorphous polymers over a wide range of temperatures and strain rates (2007, methodology): “…cooperative model of Fotheringham and Cherry (1976) for the yield response of amorphous polymers has shown a good agreement with experimental results over a wide range of strain rates and temperatures, including the glass transition region and impact loading rates (Richeton et al., 2005a, 2006).”