Three dimensional finite element computation of the non-isothermal polymer filling process by the phase field model

Gao, Puyang

doi:10.1016/j.advengsoft.2022.103207

Cited by 6 publications

(2 citation statements)

References 28 publications

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“…The melt is a typical non-Newtonian fluid, and its viscosity is affected by the temperature and shear rate changes during the filling process [27][28][29]. Thus, the above factors were taken into account, and Cross-WLF viscosity model was selected, as shown in Formulas ( 2)-( 5) [30,31]. This model integrated the effects of temperature, pressure, and shear rate on the viscosity of melt, and could accurately predict the flow process accompanied by cooling effects.…”

Section: Injection Molding Simulationmentioning

confidence: 99%

Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites

et al. 2023

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Weld lines are a common defect generated in injection molding, which apparently affects the performance of final products, but the available reports on carbon fiber-reinforced thermoplastics are still rather few. In this study, the effects of injection temperature, injection pressure, and fiber content on the mechanical properties of weld lines were studied for carbon fiber-reinforced nylon (PA-CF) composites. The weld line coefficient was also calculated by comparing specimens with and without weld lines. The tensile and flexural properties of PA-CF composites significantly increased with the rise of fiber content for specimens without weld lines, while injection temperature and pressure demonstrated slight influences on mechanical properties. However, the existence of weld lines had negative influences on the mechanical properties of PA-CF composites due to poor fiber orientation in weld line regions. The weld line coefficient of PA-CF composites decreased as fiber content increased, indicating that the damage of weld lines to mechanical properties increased. The microstructure analysis showed that there were a large number of fibers distributed vertically to flow direction in weld lines regions, which could not play a reinforcing role. In addition, increasing injection temperature and pressure facilitated fiber orientation, which improved the mechanical properties of composites with low fiber content, while weakening composites with high fiber content instead. This article provides practical information for product design containing weld lines, which helps to optimize the forming process and formula design of PA-CF composites with weld lines.

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Section: Injection Molding Simulationmentioning

confidence: 99%

Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites

et al. 2023

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“…The authors numerically analyze the flow of molten PP polymer in a free rectangular cavity and a cavity with obstruction with the objective of comparing the position of the flow front. In other work, Gao [19] used as initial inlet velocities In an injection process, the flow of molten polymer is mainly controlled by the injection pressure, which in turn is established by the injection machine [20] . Molds may contain many inlet channels and gates prior to the mold cavity [21] .…”

Section: Introductionmentioning

confidence: 99%

A methodology for determination the inlet velocity in injection molding simulations

Miranda,

Rauber,

Vaz Jr.

et al. 2024

Polímeros

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The inlet velocity of thermoplastic in injection molds plays a crucial role in obtaining high-quality polymer parts and the final performance of the product. It is known that the way the polymer is injected into the mold can directly affect important properties, such as the distribution of internal stresses, the cooling rate and the formation of surface defects. However, there are injection molding machines that only control injection pressure and dosage, making it difficult to obtain the gate inlet velocity into the mold cavity. Besides, some molds have many injection channels as well as complex inlet geometries, which make a challenging task to identify the inlet velocity. This study presents numerical and experimental approaches on how to determine the entry velocity in thermoplastic injection molds. The main results showed that these methods are highly efficient and contribute to identifying the gate inlet velocity with good accuracy.

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Modelling heat-mass transport for MHD Eyring-Powell hybrid nanofluid over an expanding surface laden by autocatalytic chemical reaction and nanoparticles diffusion

Rehman,

Hashim,

Alqahtani

et al. 2023

Advances in Engineering Software

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Three dimensional finite element computation of the non-isothermal polymer filling process by the phase field model

Cited by 6 publications

References 28 publications

Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites

Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites

A methodology for determination the inlet velocity in injection molding simulations

Modelling heat-mass transport for MHD Eyring-Powell hybrid nanofluid over an expanding surface laden by autocatalytic chemical reaction and nanoparticles diffusion

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