Injection molding simulation with solid semi-crystalline polymer mechanical behavior for ejection analysis
Mole, Nikolaj (Author), Krebelj, Kristjan (Author), Štok, Boris (Author)

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Injection molded products, produced from semi-crystalline polymers may include undercut features which can introduce distortion to the shape of the product during ejection. A thermo-mechanical modeling approach for simulating these advanced ejection problems is developed. The approach is formed by combining a method for three-dimensional residual stress prediction and an advanced material model for modeling the solid visco-elasto-plastic mechanical behavior. The task of this work is to assess, by analyzing a plaque-like product, the performance of the approach in the absence of the distortive ejection effects. The numerically predicted product shrinkage and mass at different packing pressure settings are compared to experimental results. The effect of packing pressure on product shrinkage and mass was reproduced by the model and the final residual stress field was found to be in accordance with the expectations. This confirms that the methodology could be used to analyze advanced ejection problems.

Keywords:injection molding, numerical simulation, residual stresses, shrinkage, ejection
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Number of pages:4111-4124
Numbering:9, 93
DOI:10.1007/s00170-017-0847-3 Link is opened in a new window
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Title:the international journal of advanced manufacturing technology

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