GFRP拉挤成型工艺模拟优化

为了对GFRP (玻璃纤维增强塑料) 拉挤成型非稳态温度场与固化度进行数值模拟, 依据固化动力学和非稳态导热理论, 建立了温度场和固化度动力学模型。通过 DSC试验分析确定了模型中固化度动力学参数。利用有限元与有限差分相结合的方法, 建立温度场和固化度数值模型, 应用Euler-Cauch逐步迭代法实现计算机解耦。利用有限元软件FEPG编制拉挤固化模拟程序, 详细探讨了模具温度、拉挤速度、初始温度等拉挤工艺参数对模具内温度和固化度分布的影响。数值模拟值与FBG光栅测量值比较结果吻合, 能够对拉挤工艺参数制定提供有用的信息, 以指导拉挤工艺制定。 

Simulating and optimizing of GFRP pultrusion process

In order to carry out a numerical simulation of the unstable temperature field and curing degree in the pult rusion process of GFRP , a mathematical model was established for the variation of temperature dist ribution and curing degree on the basis of curing kinetic and unstable thermal conduction theories. The kinetics parameters based on the models are determined by using differential scanning calorimet ry (DSC) . A numerical model was established for the temperature and curing degree by combining the two2 dimensional finite element with finite differential and the coupled question was solved by using Euler2Cauch step 2 by2 step iterative method. The effect s of processing parameters including pulling speed , die wall temperature and initial temperature on the profile of curing degree and temperature in the die are discussed with the pult rusion simulation program compiled with FEPG. The result of the numerical simulation corresponds well to the FBG sensor test result , which provides useful information for the pult rusion design.