A viscoplastic constitutive model for polymeric materials

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Historical review of internal state variable theory for inelasticity (2010, methodology): “Recently, Ghorbel (2008), Cantournet et al. (2009) modified a viscoplastic ISV formulation to use for viscoelastic polymers by changing the yield function to include the first three invariants of stress to include pressure dependence and strong deviatoric interactions.”
Micromechanical analysis of polymer composites reinforced by unidirectional fibres: Part I – Constitutive modelling (2013, methodology): “The DruckerPrager model or the Mohr–Coulomb model have been often used, but experimental evidence reveals that neither of these models capture properly the constitutive behaviour of an epoxy matrix (Ghorbel, 2008).”