树脂基复合材料固化过程固化度场和温度场的均匀性优化

Curing Degree Field and Temperature Field Uniformity Optimization During Curing Process of Resin Matrix Composites

针对热固性树脂基复合材料的加热固化过程,提出一种以提高固化度场均匀性为优化目标的固化加热曲线优化方法。该方法通过在固化加热曲线中合理安排升温和保温过程,提高固化度的均匀性。首先,通过有限元模拟,获得制件的固化度场和温度场,确定其不同时刻固化速度最大差值,再进一步计算出固化速度最大差值的一阶微分。通过比较固化速度最大差值及其一阶微分的极小值时刻制品的固化特性,确定升温和保温的时间。模拟结果表明,优化前后的固化度最大差值从9.8%降低到4.9%,温度最大差值从18.2℃降低到7.3℃,制品的固化度场和温度场均匀性有较大改善。

A method of heating temperature curve optimizing was proposed for improving the uniformity of curing degree field of resin matrix composite part during process. This method through reasonable arrangement of heating and heat preservation process in heating temperature curve,increasing curing uniformity. Firstly,the temperature field and curing degree field were simulated by simulation method,then the maximum difference of curing rate at different times were determined and the first order differential equation of maximum difference of curing rate was calculated. The time of heating and heat preservation were established by comparing characteristics of curing of the part at the time maximum difference in the curing degree field and its first order differential equation respectively reached their local minimum. The simulation show that the maximum difference of curing degree reduces from 9.8%to 4.9%and the maximum difference of temperature reduces from 18.2℃to 7.3℃before and after optimization,which prove the method can significantly improve the uniformity of the curing degree field and temperature field.