Unambiguous orientation in short fiber composites over small sampling area in a center-gated disk

Gregorio M. Vélez-García; Peter Wapperom; Donald G. Baird; Alex O. Aning; Vlastimil Kunc

doi:10.1016/j.compositesa.2011.09.024

Unambiguous orientation in short fiber composites over small sampling area in a center-gated disk

Gregorio M. Vélez-García, Peter Wapperom, Donald G. Baird, Alex O. Aning, Vlastimil Kunc

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

A modified version of the method of ellipses was successfully developed, validated, and implemented to characterize short fiber orientation. Unambiguous orientation and a small sampling area were obtained by distinguishing between in-plane angles of φ and φ + π for every fiber and characterizing non-elliptical footprints, respectively. Measurements in two thin center-gated disks showed the existence of an asymmetric profile of orientation at the gate, which differs from the 3D random orientation commonly assumed in simulations. This profile washed out gradually at the entry region until disappearing at about 40% of flow length. A detailed set of orientation data for comparing fiber orientation to calculated values was obtained.

Original language	English
Pages (from-to)	104-113
Number of pages	10
Journal	Composites - Part A: Applied Science and Manufacturing
Volume	43
Issue number	1
DOIs	https://doi.org/10.1016/j.compositesa.2011.09.024
State	Published - Jan 2012

Funding

The financial support of NSF/DOE: DMI-052918 is gratefully acknowledged. Research sponsored by the US Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies, as part of the Lightweight Materials Program. The authors also wish to thank Sabic Americas Inc. for supplying the Valox 420 used in this work. They also gratefully thank Dr. Audrey Zink-Sharp for providing helpful discussions about the image acquisition procedure. Gregorio M. Vélez-García also acknowledges support from NSF-IGERT: DGE-0548783 and University of Puerto Rico-Mayagüez.

Keywords

A. Fibres
B. Directional orientation
D. Optical microscopy
E. Injection molding

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10.1016/j.compositesa.2011.09.024

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Unambiguous orientation in short fiber composites over small sampling area in a center-gated disk

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