热塑性树脂连续浸渍过程的纤维断裂机制及实验

利用自行设计的浸渍模具,通过拉挤熔融浸渍工艺,定量考察了牵引速度、熔体温度和浸渍辊个数等工艺参数对连续玻璃纤维增强热塑性复合材料复合过程中纤维断裂的影响,旨在通过所建立的纤维断裂数学模型,预测预浸料生产过程中纤维断裂率并描述实验结果。结果表明:模型与实验数据吻合较好,能够为工业化生产提供指导与借鉴;纤维束在模具中拖曳而产生的黏性剪切作用是影响纤维断裂的主要因素,适当减少浸渍辊数及采用低黏度树脂能够显著降低纤维断裂,提高工艺稳定性。

Fiber fracture mechanism in process of thermoplastic resin continuous impregnation and experiments

Though the homemade impregnation mold, the effects of processing parameters such as roving pulling speed, melt temperature and number of pins on fiber fracture of continuous glass fiber reinforced thermalplastic composites were studied quantitatively in compound process. A fiber fracture mathematical model was developed for producing prepreg process to predict the fiber fracture rate and describe the experimental results. The results suggest that the model and experimental data are in good agreement. The model can provide guidance and reference for industrial production. The fiber fracture is mainly caused by viscous shear effect on fiber bundle when pulling the fiber bundle. Reducing the number of impregnation pins and using low-viscosity resin can significantly ease the fiber fracture, as well aspromote the process stability.