In this work, melt spinning experiments were tentatively used for the determination of the elongational viscosity of polymer melts at different levels of tensile strain and strain rate. The materials examined were two high-density polyethylene grades for blow moulding with similar number-average molecular mass but different polydispersity index. The data from melt spinning tests were compared with transient extensional viscosity data obtained by uniform isothermal tensile tests, performed by means of an extensional rheometer, as well as with those produced by converging flow tests (Cogswell model). The results showed that for high strain and strain rate levels, the melt spinning experiments provide elongational viscosity data quite close to the transient extensional viscosity values obtained from the tensile tests
The present paper reports and discusses the results of a 3D finite element simulation of the injection molding process of a rubber component, including the stages of the mold filling dynamics and material curing, using the "Reactive Molding" module of the Moldflow 6.2 CAE software. A differential scanning calorimeter (DSC) and a capillary rheometer are employed to characterize the rubber material in order to obtain appropriate curing reaction and viscosity models, respectively. The model parameters so obtained are used to simulate the injection molding process for an engineering rubber component with a complex geometry having a thickness distribution that ranges from 1.5 mm to 20 mm. The computations are found in good agreement with the experimental results, indicating that reliable information on material viscosity and curing kinetic play a key role for well-founded predictions.
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