Modeling and Numerical Simulation of Injection Molding of Semi-Crystalline Polymer Isotactic Polypropylene
Injection molding is one of the commonly used processing techniques for molding thermoplastics. In this process, it is well known that the melt flow in the mold cavity is exposed to complex thermo-mechanical environment characterized by high cooling rate and strong stress field, which has a major effect on the microstructure of injection-molded parts. In this paper, the kinetics and morphological evolution of crystallization was simulated numerically for the injection molding of iPP. The flow-induced effect was considered when simulating the three phases—filling, packing and cooling—of the injection molding. Not only was the parameter which reflected the effect of crystallization reflected in the equation of the relationship of stress and strain, the equation of energy conservation and other parameters of material (for example, thermal conductivity) but the flow-induced effect was also considered and the energy of dissipation was regarded as the main parameter when the kinetics of crystallization was computed. Compared with the conventional method and its result of the numerical simulation of the injection molding, the model is obviously used easily because the energy of dissipation will be computed during each time step of the numerical simulation of the injection molding. Furthermore, the modeling proposed by this paper shows more reasonable under some extent because the more factors are considered during the numerical simulation.
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Document Type: Research Article
Publication date: September 1, 2012
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