Browse > Article
http://dx.doi.org/10.7234/kscm.2011.24.6.031

Impact of Fiber Projection from GMT-Sheet Moldings on Surface Unevenness  

Kim, Hyoung-Seok (조선대학교 대학원 첨단부품소재공학과)
Kim, Jin-Woo (광주테크노파크 차세대자동차전장부품생산지원센터)
Kim, Yong-Jae (조선대학교 전기공학과)
Lee, Dong-Gi (조선대학교 메카트로닉스공학과)
Publication Information
Composites Research / v.24, no.6, 2011 , pp. 31-36 More about this Journal
Abstract
According to the evaluation on GMT-sheet by molding conditions, fiber projection on the moldings surface was investigated. Fiber projection is one of the major defects on moldings surface due to matrix shrinkage. That is, fiber projection happens from different shrinkage of matrix and glass fiber. Height of fiber projection from moldings surface becomes smaller when molding pressure is higher during holding pressure and cooling process. Height of fiber projection is dominantly affected by molding pressure. With consideration of molding pressure, the formation of surface unevenness and change in fiber projection height was elucidated. In addition, coating layer is effective to suppress surface defects, and there is no fiber projection or crack in case that coating is applied. Coating layer improves surface roughness up to the level of the polypropylene which is a single material.
Keywords
GMT-Sheet moldings; Surface roughness; Surface unevenness; Fiber projection; Coating layer;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Lee, S.S., Kwak, T.H., and Min T.I., "Characteristic and Use of GMT-Sheet," Proceedings of The Korean Society for Composite Materials, 1996, pp. 1-8.
2 Shahzad, A., Farzana, H., Muhammad, I., Waqas, I., and Khuram, K., "Effect of Orientation of Glass Fiber on Mechanical Properties of GRP Composites," Journal of the Chemical Society of Pakistan, Vol. 32, No. 3, 2010, pp. 265-269.
3 Kim, H.S., Kim, J.W., Kim, Y.J., and Lee, D.G., "Effects of Molding Condition on Surface Unevenness of GMTSheet Moldings," Journal of The Korean Society for Composite Materials, Vol. 23, No. 5, 2010, pp. 30-38.   DOI   ScienceOn
4 Kim, H.S., Kim, J.W., Kim, Y.J., and Lee, D.G., "Effects of Molding Condition on Surface Unevenness of GFRP Composites in Compression Molding," Transactions of the KSME(A), Vol. 34, No. 11, 2010, pp. 1649-1657.
5 Lee D.G., Yoo J.H., and Kim E.G., "A Study of Correlation between Separation and Orientation of Fibers during Compression Molding of Long Fiber-Reinforced Polymeric Composites," Transactions of the KSME(A), Vol. 17, No. 1, 1993, pp. 62-68.
6 Lee, D.G., Kim, J.L., Kim, S.P., Lee, W.I., and Kim, E.G., "A Study on the Processing of Long Fiber-Reinforced Composite Materials for Thermoforming," Transactions of the KSME(A), Vol. 17, No. 5, 1993, pp. 1106-1114.
7 Kang, K., Jo, S.H., Lee, D.G., and Kim, E.G., "A Study on Mean Coefficient of Separation during Compression Molding of Fiber-Reinforced Thermoplastics," Transactions of the KSME(A), Vol. 20, No. 4, 1996, pp. 1146-1153.
8 Lee, D.G., and Cho, K.H., "A Study on Structure and Separation.Orientation of Fiber-Reinforced Thermoplastic Sheet," Journal of The Korean Society of Precision Engineering, Vol. 10, No. 2, 1993, pp. 104-113.
9 Serope Kalpakjian, Manufacturing Enginee-ring and Technology, Addison-Wesley Publishing Company, 1992, pp. 211-218.
10 Tim, A.Osswald., and Georg, Menges., Materials Science of Polymers for Engineers, HANSER, 1998, pp. 211-215.