Modelling and Simulation in Materials Science and Engineering · 2007 · 58 citations · 20 references
EngineeringViscoplastic ParametersMechanical EngineeringEvolutionary AlgorithmsEvolutionary ApproachSoft MatterMechanics ModelingPolymersMechanicsPolymer ProcessingRheologyPolymer CompositesMaterials ScienceSolid MechanicsPlasticityRepresentative Glassy PolymerRheological Constitutive EquationViscoplastic FluidPolymer SciencePhenomenological Constitutive EquationsStrain SofteningConstitutive ModelingPolymer CharacterizationPolymer PropertyPolymer ModelingMechanics Of Materials
This study is concerned with the viscoplastic behaviour of polymers. A modified viscoplastic Bodner–Partom model was extended to include successively the post-yield (strain softening and strain hardening) and the pre-yield behaviour. In order to identify material parameters of the constitutive law, an analytical scheme and a numerical method based on evolutionary algorithms were developed. The capacity of the proposed viscoplastic approach is investigated for a representative glassy polymer (polycarbonate). The results and the efficiency of both approaches are discussed.
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