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Correlation between fiber orientation distribution and mechanical anisotropy in glass-fiber-reinforced composite materials

  • Senji Hamanaka , Chisato Nonomura , Thanh Binh Nguyen Thi and Atsushi Yokoyama EMAIL logo
Published/Copyright: July 9, 2019
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Journal of Polymer Engineering
From the journal Journal of Polymer Engineering Volume 39 Issue 7

Abstract

This study investigates the correlation between the fiber orientation distribution along the thickness and mechanical anisotropy in injection-molded products using a thermoplastic resin reinforced by short fibers. To this end, polyamide-6 samples containing 15, 30, 50, and 65 wt% of short fiberglass were compounded, and flat plates with side gates were injection-molded. The fiber orientation distribution near the center of the plates was observed via X-ray computed tomography and that along the thickness was quantified via a fiber orientation tensor. Coupon test pieces were cut from the plates along the machine and transverse directions, and a three-point bending test was performed. Mechanical anisotropy was evaluated from the ratio of the flexural modulus in each direction. Evaluation results of the fiber orientation distribution and mechanical anisotropy were compared. As a result of the above investigation, a clear correlation was found between the fiber orientation distribution and mechanical anisotropy when the glass fiber content was 15–50 wt%. In the anisotropic expression under the condition of high glass fiber content (65 wt%), contributions of parameters other than the fiber orientation distribution became evident.

Keywords: composite; fiber orientation; injection molding; polyamide-6; X-ray CT

Acknowledgments

This work was supported by the Research Center of Toyobo Co., Ltd., Otsu City, Shiga 520-0243, Japan, and by the Department of Advanced Fibro-Science, Kyoto Institute of Technology, Kyoto city, Kyoto 606-8585, Japan.

Appendix

The moment of inertia of the area in the case of a laminated plate is expressed by the following equations according to the parallel axis theorem:

(A.1)Ep=(∑i=1nEiIi)/Ip (i=1, 2, 3, 4, …, n)
(A.2)Ip=bH3/12
(A.3)Ii=bH3/12+ bhyi2 (i=1, 2, 3, 4, …, n)

Here, Ep is the longitudinal elastic modulus of the laminated material, Ip is the geometrical moment of inertia of the laminate, Ei is Young’s modulus of each layer, Ii is the geometrical moment of inertia of each layer, yi is the distance between the center of each layer in the thickness direction and the neutral axis of the laminate material, H is the thickness of the laminated material, h is the thickness of each layer, and b is the width of the laminate.

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Received: 2018-11-25
Accepted: 2019-05-23
Published Online: 2019-07-09
Published in Print: 2019-07-26

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/polyeng-2018-0371
Keywords for this article
composite; fiber orientation; injection molding; polyamide-6; X-ray CT

Articles in the same Issue

  1. Frontmatter
  2. Material properties
  3. Banana and plantain fiber-reinforced polymer composites
  4. Characterizations of PMMA-based polymer electrolyte membranes with Al2O3
  5. Effects of grafting parameters on the properties of proton exchange membranes based on sulfo-functionalized porous silicon for micro direct methanol fuel cells
  6. The effect of surface modification of PMMA/chitosan composites on improving adsorption properties for chelating Pb2+
  7. Characterization of organic solar cells using semiconducting polymers with different bandgaps
  8. Hindered phenol-mediated damping of polyacrylate rubber: effect of hydrogen bonding strength on the damping properties
  9. Correlation between fiber orientation distribution and mechanical anisotropy in glass-fiber-reinforced composite materials
  10. Preparation and assembly
  11. Replacement of sodium alginate polymer, urea and sodium bicarbonate in the conventional reactive printing of cellulosic cotton
  12. Carboxylic acid modified pH-responsive composite polymer particles
  13. Synthesis of SiO2 nanoparticle from bamboo leaf and its incorporation in PDMS membrane to enhance its separation properties
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