Injection molding simulation with solid semi-crystalline polymer mechanical behavior for ejection analysis

Mole, Nikolaj; Krebelj, Kristjan; Štok, Boris

doi:10.1007/s00170-017-0847-3

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…About polymer fusion, different laws of viscoelasticity apply. This is an expression of the Maxwell model, the treatment of flow problems is based on the resolution of equations derived from conservation principles [16,17]: * Preservation of the mass:…”

Section: Finite Element Resolution Methodsmentioning

confidence: 99%

Finite Element Modeling of the Thermomechanical Behavior of Polyethylene

Khlifa,

Lammari,

Chtourou

et al. 2024

Mater. Plast.

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This article presents a finite element study based on tests of characterizations to find the properties of the materials studied, the injection-blowing technique, chosen in this case, is characterized by the bi-axial of the material, and one benefits from the orientation of the macromolecules in the directions of use of the material. The objective of this work is to link all the mechanical and thermal parameters during the treatment of molten polymer materials subjected to high-stress rates that can lead to significant temperature increases due to viscous heating in the order of 200�C. Predicting the temperature range is essential for good temperature control and is a major factor in determining the quality of the final product. This forces us to choose an adequate law of behavior, capable of translating the mechanical evolution under the thermal effect while explaining the rheological response of the viscoelastic metal. So this process is usually accompanied by geometric defects resulting from the original residual stresses cooling speed and the process itself. In the packaging of food products, as in this case, the bottles require to have a stable filling and a certain storage capacity.

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Section: Finite Element Resolution Methodsmentioning

confidence: 99%

Finite Element Modeling of the Thermomechanical Behavior of Polyethylene

Khlifa,

Lammari,

Chtourou

et al. 2024

Mater. Plast.

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“…The experimental counterpart of the examined case consists of pressure evolutions that were measured and published before [ 21 ]. The temperature of the mold cooling water was set to 50 °C, leading to about 52 °C at the surface of the cavity while the melt temperature was set to 220 °C.…”

Section: Methodsmentioning

confidence: 99%

Modeling Injection Molding of High-Density Polyethylene with Crystallization in Open-Source Software

Krebelj

Krebelj²,

Halilovic̆

et al. 2020

Polymers

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This work investigates crystallization modeling by modifying an open-source computational fluid dynamics code OpenFOAM. The crystallization behavior of high-density polyethylene (HDPE) is implemented according to theoretical and experimental literature. A number of physical interdependencies are included. The cavity is modeled as deformable. The heat transfer coefficient in the thermal contact towards the mold depends on contact pressure. The thermal conductivity is pressure- and crystallinity-dependent. Specific heat depends on temperature and crystallinity. Latent heat is released according to the crystallization progress and temperature. Deviatoric elastic stress is evolved in the solidified material. The prediction of the cavity pressure evolution is used for the assessment of the solution quality because it is experimentally available and governs the residual stress development. Insight into the thermomechanical conditions is provided with through-thickness plots of pressure, temperature and cooling rate at different levels of crystallinity. The code and simulation setup are made openly available to further the research on the topic.

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“…For more details about the solver employed in this work, the reader is referred to Mole et al [8] and Krebelj and Turk [9].…”

Section: Numerical Discretizationmentioning

confidence: 99%

“…She also showed that differences in polymer and air viscosities were some of the main reasons for the large number of instabilities observed in the numerical calculation procedure. Recently, also aiming to model the IM process, the works in Mole et al [8] and Krebelj and Turk [9] implemented both the Cross-WLF and modified Tait models in the compressibleInterFoam (a solver designated by openInjMoldSim). The objective was to simulate the filling and packing stages, considering compressible flow, and applying appropriate models for the polymeric materials' behavior.…”

Section: Introductionmentioning

confidence: 99%

“…She also reported that the open-source solver was 18 times slower than the proprietary one. This work describes the numerical validation of an open-source solver, openInjMoldSim [8,9], able to simulate the filling stage of the thermoplastic IM process. For that purpose, mesh sensitivity studies were performed for all the validation case studies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Verification and Validation of openInjMoldSim, an Open-Source Solver to Model the Filling Stage of Thermoplastic Injection Molding

Pedro

Ramoa

Nóbrega

et al. 2020

Fluids

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In the present study, the simulation of the three-dimensional (3D) non-isothermal, non-Newtonian fluid flow of polymer melts is investigated. In particular, the filling stage of thermoplastic injection molding is numerically studied with a solver implemented in the open-source computational library O p e n F O A M ® . The numerical method is based on a compressible two-phase flow model, developed following a cell-centered unstructured finite volume discretization scheme, combined with a volume-of-fluid (VOF) technique for the interface capturing. Additionally, the Cross-WLF (Williams–Landel–Ferry) model is used to characterize the rheological behavior of the polymer melts, and the modified Tait equation is used as the equation of state. To verify the numerical implementation, the code predictions are first compared with analytical solutions, for a Newtonian fluid flowing through a cylindrical channel. Subsequently, the melt filling process of a non-Newtonian fluid (Cross-WLF) in a rectangular cavity with a cylindrical insert and in a tensile test specimen are studied. The predicted melt flow front interface and fields (pressure, velocity, and temperature) contours are found to be in good agreement with the reference solutions, obtained with the proprietary software M o l d e x 3 D ® . Additionally, the computational effort, measured by the elapsed wall-time of the simulations, is analyzed for both the open-source and proprietary software, and both are found to be similar for the same level of accuracy, when the parallelization capabilities of O p e n F O A M ® are employed.

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Injection molding simulation with solid semi-crystalline polymer mechanical behavior for ejection analysis

Cited by 5 publications

References 24 publications

Finite Element Modeling of the Thermomechanical Behavior of Polyethylene

Finite Element Modeling of the Thermomechanical Behavior of Polyethylene

Modeling Injection Molding of High-Density Polyethylene with Crystallization in Open-Source Software

Verification and Validation of openInjMoldSim, an Open-Source Solver to Model the Filling Stage of Thermoplastic Injection Molding

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