教師資料查詢 | 類別: 期刊論文 | 教師: 黃招財 CHAO-TSAI HUANG (瀏覽個人網頁)

標題:Investigation of the Viscoelastic Behavior Variation of Glass Mat Thermoplastics (GMT) in Compression Molding
學年107
學期2
出版(發表)日期2019/02/14
作品名稱Investigation of the Viscoelastic Behavior Variation of Glass Mat Thermoplastics (GMT) in Compression Molding
作品名稱(其他語言)
著者Chao-Tsai Huang; Ling-Jue Chen; Tse-Yu Chien
單位
出版者
著錄名稱、卷期、頁數Polymers 11(2), p.335
摘要Compression molding is a lightweight technology that allows to preserve fiber length and retain better mechanical properties compared to injection molding. In compression molding development, a suitable material such as glass fiber mat thermoplastics (GMT) is often used. However, because of the complicated micro-structure of the fibers and the fiber–resin matrix interactions, it is still quite challenging to understand the mechanism of compression molding and it is very difficult to obtain a uniformly compressed GMT product. In this study, we propose a method to measure the rheological properties of GMT through a compression system. Specifically, we utilized a
compression molding system to record the relation between the loading force and the displacement.
This quantitative information was used to estimate the power-law index and viscoelastic parameters and predict viscosity.
Moreover, the estimated viscoelastic parameters of GMT were implemented into Moldex3D to evaluate the flow behavior under compression. The results showed that the trend of the loading force variation was consistent in numerical simulation and experiments. However, at the final stage of compression molding, the experimental loading force was much higher than that estimated by simulation. To find out the mechanism causing this deviation, a series of studies were performed. Through TGA measurement, we found that the fiber content of the center portion of the compressed part increased from 63% to 85% during compression. This was expected, as a result of the fiber–polymer matrix separation effect. This fiber–polymer matrix separation effect influenced the power-law index and rheological parameters of GMT, making them fluctuate. Specifically, the power-law index changed from 1.0 to 0.62. These internal changes of the rheological properties further induced a much higher loading force in the real experimental GMT system. We further verified the rheological properties variation using pure polyamide (PA) and found that since there is
no fiber–polymer matrix interactions the power-law index and curve-fitting rheological parameters were almost constant. The mechanism causing the deviation was therefore validated.
關鍵字compression molding;glass mat thermoplastics (GMT);viscoelasticity;fiber–polymer matrix separation
語言英文
ISSN2073-4360
期刊性質國外
收錄於SCI;
產學合作
通訊作者黃招財
審稿制度
國別瑞士
公開徵稿
出版型式,電子版
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