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Journal: IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN) | Year:1382 | Volume:16 | Issue:1 (ISSUE NO. 63) | Start Page:31 | End Page:40

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Title

STUDY OF THE EFFECT OF CORE-TWIST HYBRID YARN GLASS/PET ON MECHANICAL PROPERTIES OF UNSATURATED POLYESTER RESIN

Pages

 Start Page 31 | End Page 40

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Abstract

 The use of continuous filament with special characteristics in the formation processes of the composites, including filament-winding, pultrusion is increasing rapidly. In this study, fiber-glass and saturated polyester yarn (with different structures) are applied as the central core and the cover, respectively. The former, due to its high modul us and tensile strength and the latter, due to its high extensibility are used in a matrix of unsaturated polyester resin in the form of three layered, unidirectional fabric. The present article studies the influence of covering percentage and polyester cover structure on physical and mechanical properties of the compounds. Physical and mechanical tests have been carried out in both vertical and horizontal directions to the fiber orientation. Results showed that the tensile and impact energy absorption as well as the other mechanical characteristics of the compound are being reinforced with glass yarn, which is in turn covered with spun polyester, show a much better performance than the others. Furthermore, a twist of 400 TPM covering yarn can improve the mechanical properties of the compounds significantly. Twist, structure and the type of covering yarn could have an influence on the surface fracture of the composites. Thereby, it would become possible to alter the surface fracture from a destructive state into a controlled condition.

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