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Manufacturing and evaluation of elastic properties of glass fiber reinforced polymers material

Nguyen Luong Thien, Nguyen Tien The, Tran Nguyen Quyet


Glass fiber reinforced polymer (GFRP) is a new material with many advanced features in terms of strength, light weight, anti-corrosion ability on salty environment, which may replace steel. In this work, we present the technology of manufacturing of GFRP in bar form: pultrusion technology. The production line at the factory is imported from abroad. The objective of the research is to step by step mastering the technology and fully master the production line system of GFRP in bar form in Vietnam. We have fabricated successfully a product of high applicability, which has great potential for development (GFRP in bar form with large diameter, 20 mm). Pultrusion is one of technologies to fabricate the polymer composites used in many industries such as in aerospace, automotive and construction ones industries. The high performance pultruded products that are produced by this technique offer high fiber content of at least 70%. In order to produce high quality pultruded profiles, there are variables such as fiber impregnation, resin viscosity, pulling speed and curing temperature that have to be considered and these requests are discussed in this study. The aim of the present work is evaluating elastic properties like Young's modulus and Poisson's ratio from analytical methods such as Rule of mixture, Halpin-Tsai, Nielsen, Chamis and Hashin elastic models and compared with experiment results. The result shows a big difference. The mechanical characteristics of the GFRP D20 bar depend not only on the composition of components (fiber and epoxy) but also on the manufacturing technology. We propose a further research direction: to optimize the technological element in manufacturing GFRP bar with large diameter.


GFRP; pultrusion; Young's modulus; Poisson's ratio

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