The use of flow type dependent strain reduction factor to improve fiber orientation predictions for an injection molded center-gated disk
| Autor: | Donald G. Baird, Peter Wapperom |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Mechanical Engineering Glass fiber Flow (psychology) Computational Mechanics Kinematics Mechanics Function (mathematics) Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Simple shear Mechanics of Materials Orientation (geometry) 0103 physical sciences Fiber 010306 general physics Constant (mathematics) |
| Zdroj: | Physics of Fluids. 31:123105 |
| ISSN: | 1089-7666 1070-6631 |
| DOI: | 10.1063/1.5129679 |
| Popis: | To predict fiber orientation for injection molded parts, it is important to use a slow-kinetics orientation model and pay careful attention to the role of flow kinematics on orientation evolution speed. A model incorporating the impact of flow type on the fiber reorientation rate was tested by comparing with experimental data measured in an injection molded center-gated disk for both short and long glass fiber thermoplastics. Unlike the existing orientation models using a constant factor, a variable strain reduction factor (SRF) is expressed as a function of an objective flow-type parameter reflecting local flow kinematics. The use of this model improved the fiber orientation predictions at locations where the constant SRF, obtained from simple shear flow, deviated significantly from that based on the local flow kinematics. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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