聚酰胺连续纤维浸渍复合加工的停留时间理论模型

采用停留时间分布（RTD）函数和自行设计的弯曲流道浸渍模具，对连续纤维增强聚酰胺复合材料加工过程中的停留时间进行研究，建立了弯曲流道停留时间的数学模型，并通过实验验证了模型的可靠性，结果表明该模型可以准确预测树脂在浸渍模具中的停留时间。采用Box-Behnken响应面法设计5因素3水平的试验方案，模拟了模具结构对加工过程中外部累积体积分数为95%时所对应的停留时间（t₉₅）的影响，结果表明，流道单元长度和流道单元个数对t₉₅的影响最大。通过模拟优化试验得到了浸渍模具结构的最优参数为：流道单元长度12.5 mm，流道圆角半径3 mm，流道单元个数10个，流道单元夹角160°，模具间隙1.4 mm。

Theoretical model of the residence time for composite processing of polyamide continuous fiber impregnation

The residence time in the processing of continuous fiber reinforced polyamide composite materials has been studied using the residence time distribution (RTD) function and a self-made curved channel impregnation mold. A mathematical model of the residence time of the curved channel was established and verified experimentally. The results show that the model can accurately predict the residence time of the resin in the impregnation mold. A test scheme with five factors and three levels was designed using the Box-Behnken response surface method, and the influence of mold structure on the corresponding residence time when the external cumulative volume fraction is 95% (t₉₅) during processing was simulated. The results show that the length and number of the channel unit have the greatest influence on t₉₅. By means of the simulation and optimization test, the optimal parameters of the impregnation mold structure were obtained as follows:the length of the channel unit was 12.5 mm, the radius of the channel fillet was 3 mm, the number of the channel units was 10, the angle of the channel unit was 160°, and the mold gap was 1.4 mm.