Investigation of the influencing factors on the process-dependent elasticity modulus in extrusion blow molded plastic containers for material modelling in the finite element simulation

Grommes, Dirk; Bruch, Olaf; Geilen, Johannes

doi:10.1063/1.4965518

Cited by 7 publications

(11 citation statements)

References 6 publications

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“…Several properties of the final part such as the deformation behavior are predictable. Nevertheless, simulation results strongly depend on the input data for the analysis procedure [1][2][3][4][5]. Clearly the material description, consisting of the choice of the material model and the related material properties, influences the results.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Crystallization and Relaxation Effects in Coarse-Grained Polyethylene Systems after Uniaxial Stretching

et al. 2021

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In this study, we investigate the thermo-mechanical relaxation and crystallization behavior of polyethylene using mesoscale molecular dynamics simulations. Our models specifically mimic constraints that occur in real-life polymer processing: After strong uniaxial stretching of the melt, we quench and release the polymer chains at different loading conditions. These conditions allow for free or hindered shrinkage, respectively. We present the shrinkage and swelling behavior as well as the crystallization kinetics over up to 600 ns simulation time. We are able to precisely evaluate how the interplay of chain length, temperature, local entanglements and orientation of chain segments influences crystallization and relaxation behavior. From our models, we determine the temperature dependent crystallization rate of polyethylene, including crystallization onset temperature.

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Section: Introductionmentioning

confidence: 99%

“…In many cases, specific material properties, which are generally determined by experiments, are not available. Furthermore, performing the necessary experiments is associated with high costs, especially if different types of experiments are needed to fully characterize the material's behavior [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Crystallization and Relaxation Effects in Coarse-Grained Polyethylene Systems after Uniaxial Stretching

et al. 2021

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“…No significant difference on tensile properties was observed among samples and it was concluded that the extruded polyethylene material is isotropic in terms of tensile behavior [ 18 ]. However, Grommes et al [ 19 ] reported significant anisotropy effect in elastic modulus for blow molded HDPE between extrusion direction and blowing direction (perpendicular to extrusion) for blow molded HDPE. Elastic modulus in the direction of extrusion was approximately 8% higher than in the direction perpendicular to it.…”

Section: Introductionmentioning

confidence: 99%

“…Elastic modulus in the direction of extrusion was approximately 8% higher than in the direction perpendicular to it. [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Tensile Behavior of High-Density Polyethylene Including the Effects of Processing Technique, Thickness, Temperature, and Strain Rate

Amjadi¹,

Fatemi²

2020

Polymers

100

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The primary goal of this study was to investigate the monotonic tensile behavior of high-density polyethylene (HDPE) in its virgin, regrind, and laminated forms. HDPE is the most commonly used polymer in many industries. A variety of tensile tests were performed using plate-type specimens made of rectangular plaques. Several factors can affect the tensile behavior such as thickness, processing technique, temperature, and strain rate. Testing temperatures were chosen at −40, 23 (room temperature, RT), 53, and 82 °C to investigate temperature effect. Tensile properties, including elastic modulus, yield strength, and ultimate tensile strength, were obtained for all conditions. Tensile properties significantly reduced by increasing temperature while elastic modulus and ultimate tensile strength linearly increased at higher strain rates. A significant effect of thickness on tensile properties was observed for injection molding specimens at 23 °C, but no thickness effect was observed for compression molded specimens at either 23 or 82 °C. The aforementioned effects and discussion of their influence on tensile properties are presented in this paper. Polynomial relations for tensile properties, including elastic modulus, yield strength, and ultimate tensile strength, were developed as functions of temperature and strain rate. Such relations can be used to estimate tensile properties of HDPE as a function of temperature and/or strain rate for application in designing parts with this material.

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“…In order to capture the strong influence on the process conditions, the material behavior of the used semi crystalline polymers such as e. g. high‐density polyethylene (HDPE), needs to be modeled in a broad time and temperature range. In addition, process‐dependent orthotropic material behavior has been observed for extrusion blow molded parts, which needs to be considered [8–10]. Previous studies use isotropic linear viscoelastic material models to cover the time and temperature dependence of the material behavior, but neglect the orthotropic process‐dependent material behavior [1–7].…”

Section: Introductionmentioning

confidence: 99%

Shrinkage simulation of blow molded parts using viscoelastic material models

Michels

Bruch

Evers-Dietze

et al. 2022

Materialwissenschaft Werkst

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The utilization of simulation procedures is gaining increasing attention in the product development of extrusion blow molded parts. However, some simulation steps, like the simulation of shrinkage and warpage, are still associated with uncertainties. The reason for this is on the one hand a lack of standardized interfaces for the transfer of simulation data between different simulation tools, and on the other hand the complex time‐, temperature‐ and process‐dependent material behavior of the used semi crystalline polymers. Using a new vendor neutral interface standard for the data transfer, the shrinkage analysis of a simple blow molded part is investigated and compared to experimental data. A linear viscoelastic material model in combination with an orthotropic process‐ and temperature‐dependent thermal expansion coefficient is used for the shrinkage prediction. A good agreement is observed. Finally, critical parameters in the simulation models that strongly influence the shrinkage analysis are identified by a sensitivity study.

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Investigation of the influencing factors on the process-dependent elasticity modulus in extrusion blow molded plastic containers for material modelling in the finite element simulation

Cited by 7 publications

References 6 publications

Investigation of Crystallization and Relaxation Effects in Coarse-Grained Polyethylene Systems after Uniaxial Stretching

Investigation of Crystallization and Relaxation Effects in Coarse-Grained Polyethylene Systems after Uniaxial Stretching

Tensile Behavior of High-Density Polyethylene Including the Effects of Processing Technique, Thickness, Temperature, and Strain Rate

Shrinkage simulation of blow molded parts using viscoelastic material models

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