预浸料先进拉挤成型的固化传热过程数值模拟

Numerical simulation of curing and heat transfer process of prepreg in advanced pultrusion

对M21C碳纤维/环氧树脂复合材料预浸料在先进拉挤成型过程中的温度与固化度曲线进行了研究。使用DSC测得M21C预浸料在升温与恒温状态下的固化反应动力学方程,用于树脂固化反应的计算。基于有限元软件,结合有限差分法与体积控制法编写脚本解决热传导与树脂固化反应的计算,从而得到温度与固化度曲线,并在先进拉挤生产中测得实际的温度与固化度曲线,结果表明计算与实测曲线基本吻合,因此验证了算法的可行性。改变先进拉挤的工艺参数(加热温度区间、拉挤速度)再进行模拟计算,通过计算结果优化工艺参数,得到帽形梁先进拉挤三区间加热的理想工艺参数:模具加热温度区间为160-180-200℃;拉挤速度为1 cm/60 s。

The temperature and cure curves of the M21C carbon fiber/epoxy composite prepreg in the advanced pultrusion process were studied.The kinetic equation of curing reaction of M21C prepreg under elevated and constant temperature was measured by DSC,which was used for the calculation of resin curing reaction.Based on the finite element software,the script combined with finite difference method and volume control method was used to solve the calculation of heat transfer and resin curing reaction,so as to obtain the temperature and cure curve,and the actual curve was measured in the production.The results show that the calculation curve is basically consistent with the measured curve,so the feasibility of the algorithm is verified.The process parameters of the advanced pultrusion(heating temperature interval and pultrusion speed)were changed and then simulation calculation was carried out.The process parameters can be optimized by calculation results.The ideal process parameters of the threesection heating in cap-beam advanced pultrusion were obtained.The ideal mold heating temperature range is 160-180-200℃.The ideal pultrusion speed is 1 cm/60 s.