Mechanical Properties of Self-reinforced Polyester Composites with Commingled Yarns
| Autor: | Hsiao-Ting Su, 蘇筱婷 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 In this study, modified the PET to lower melting point, then use tubular braiding machine braiding high-strength PET yarn to produce the commingle yarn. Contural 50% fiber volume containing of two kind PET yarn, and design five different yarn structure to made five different prepreg fabric. Use vacuum hot pressing to product self-reinforced polyester composites, control of rapid cooling and slow cooling of the cooling rate of the two different variables to compare the same dense weave of different mechanical properties of hybrid yarn structure, yarn structure of different organizations with different woven self-reinforced composite materials, mechanical properties, find the best mix of weaving conditions, and rapid cooling and slow cooling of two different parameters on the whole process of polyester reinforced composite material properties from the impact, and the specimens for mechanical and failure modes of behavior. After the reinforcement material impregnated with different modified PET copolymer thermoplastic resin molding composite materials to compare their physical properties and mechanical properties of the whole self-reinforced polyester composites of glass fiber and hemp fiber alternative suggestions This thesis has two-axis circular knitting mechanism to make five full-polyester mixed yarn A, B, C, D, E, and proofing as AA, BB, CC, DD, AE five different pre-shaped fabric forming sake of polyester self-reinforced composite materials, the results showed that compared with pure PET resin from the mechanical properties of the whole self-reinforced polyester composites have very significantly improved, especially in the shocks, can be found that the modified without the PET fiber reinforced pure materials impact strength was 27.8 J / m, is very brittle, but strengthened by the woven fabric, the impact is very significant enhancement of the nature of the specimen itself, the impact strength values up to 1050.33 J / m, compared with starting pure PET resin increased about 40 times. Density by the same organization with different physical properties of yarn structure can be found, CC have the best properties of yarn structure. Cooling rate comparison can be found, the use of water in the rapid cooling process can enhance the whole polyester self-reinforced composite material properties, and found the same weave density of different hybrid yarn structure of the full-polyester self-reinforced composites also have physical differences, which CCf the the best properties, bending strength 92.1 MPa, flexural modulus is also 4.29 GPa, impact strength is up to 1050.33 J / m. The second part of the whole polyester reinforced composite materials for the different reinforcement material impregnated with the production of PET thermoplastic resin composite material mechanical properties, the results found compare to glass/PET thermoplastic composite, the polyester self-reinforced composite materials have replaced traditional fiber composites made possible, and in the case of lower density, but also be effective for weight loss products, to achieve the purpose of lightening. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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