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    題名: Study on the Viscoelasticity Properties of the Glass Mat Thermoplastics (GMT) in Compression Molding System.
    作者: Huang, Chao-Tsai (CT);Chen, Ling-Jue;Chien, Tse-Yu;Sun, Shih-Po;Wang, Chih-Wei;Hsu, Chih-Chung;Hsu, David;Chang, Rong-Yeu
    關鍵詞: Viscoelasticity;Glass Mat Thermoplastics (GMT);Compression Molding;fiber-resin matrix separation
    日期: 2019-03-18
    上傳時間: 2020-01-10 12:10:12 (UTC+8)
    出版者: Society of Plastics Engineers
    摘要: Compression molding is one of the lightweight technologies able to provide efficient way to retain fiber length for better mechanical property comparing to injection molding. In compression molding development, materials such as glass fiber mat thermoplastics (GMT) are often applied. However, due to the complicated micro-structure of the reinforced material, and the interaction of fiber-resin matrix, it is still challenge to have uniform compressed GMT product. In this study, we have developed a method to measure the rheological properties of GMT material through a compression system. Specifically, we have utilized compression molding system to estimate the rheological parameters of GMT. Those rheological parameters are then integrated into CAE (Moldex3D) to evaluate the flow behavior under the compression operation. Results showed that the trend of the loading force is increased exponentially against displacement at various compression speeds. However, some significant differences between simulation and experiment are observed. Specifically, at the early compression stage, the volume of long fiber-resin matrix is expanded by 50% in real experiment. This causes the loading force difference at the beginning between simulation and experiment. On the other hand, at the middle to the end stage, due to the fiber-resin matrix separation, the more the resin left the matrix, the higher the resistance generated. This results in the jump up of the loading force in the real experiments comparing to the simulation prediction. This deviation can be validated through the measurement of fiber content through TGA.
    關聯: SPE Technical Papers 35, p.1-5
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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