摘要
本文使用挤压流动技术研究了玻璃纤维毡增强聚丙烯片材(GMT)的各向异性流动行为。GMT的增强材料是采用干法制造的连续纤维针刺毡。实验中GMT/PP圆片试样放在平行模板间,在200℃下进行轴对称等温挤压流动研究,由试验机自动记录挤压过程中挤压力与合模速度和位移的关系。最后,通过两种简单的数学模型来模拟挤压流动:纯拉伸流动和纯剪切流动。研究结果表明:GMT挤压流动过程中拉伸流动为主导流动,剪切应力的影响较小,可以应用拉伸流动模型来预测压力的大小。
The anisotropic flow behaviour of glass fibre/polypropylene glass mat thermoplastic （GMT） has been investigated using axisymmetric squeeze flow testing between parallel circular plates. The material has a continuous swirled fiber mat construction and is manufactured by the melt-impregnation technique.The isothermal compression molding at 200 of GMT is investigated between parallel circular plates on a 30KN test machine to characterize the theological parameters for squeezing flows of the material. Modelling of squeeze flow behaviour has been based on two simple expressions：one assumes pure shear flow, during testing, while the other assumes pure biaxial extension （plug flow）. The modelling results suggest that biaxial extension dominates the isothermal squeeze flow process, with apparently negligible shear flow effects.
出处
《武汉科技学院学报》
2006年第11期33-37,共5页
Journal of Wuhan Institute of Science and Technology
基金
国家"863"项目(项目编号:2003AA305920)
