环氧树脂基预浸料热固化特征温度和固化度研究

复合材料科学与工程 ›› 2015, Vol. 0 ›› Issue (2): 16-20.

环氧树脂基预浸料热固化特征温度和固化度研究

陈淑仙^*, 田鹤, 李梦, 杨文锋

中国民航飞行学院航空工程学院,四川广汉618307

收稿日期:2014-08-11 出版日期:2015-02-28 发布日期:2021-09-14
作者简介:陈淑仙(1975-),女,博士,副教授,主要从事复合材料固化过程研究,bellesavana@163.com。本文作者还有秦文峰和唐庆如
基金资助:
国家自然科学基金民航联合基金重点项目(U1233202,U1333201);国家自然科学基金项目(51306201);江苏省航空动力系统重点实验室开放课题资助项目(APS-2013-04)

CHARACTERISTIC TEMPERATURE AND CURING DEGREE OF EPOXY RESIN MATRIX PREPREG DURING THERMAL CURING PROCESS

CHEN Shu-xian^*, TIAN He, LI Meng, YANG Wen-feng

Aviation Engineering Institute, Civil Aviation Flight University of China, Guanghan 618307, China

Received:2014-08-11 Online:2015-02-28 Published:2021-09-14

摘要/Abstract

摘要： 基于固化动力学理论和有限元分析方法,建立了树脂基预浸料热固化过程中温度场研究的数学模型,数值模拟了预浸料固化过程的温度和固化度变化特征,将数值计算结果与已有文献实验结果对比,验证了计算模型和计算方法的正确性。研究了升温速率、玻璃纤维等因素对环氧树脂体系固化反应特征温度以及固化时间的影响。结果表明,升温速率增加,固化反应放热峰T_p向高温方向移动,同时固化起始温度T_i和固化终止温度T_f也相应地向高温移动,固化过程中材料内温度梯度增大,内部热应力增大。但提高升温速率可缩短固化完成所需时间。玻璃纤维的加入使树脂基预浸料各项固化反应特征温度降低,达到固化起始温度的时间延长,但对完成固化时间的影响可忽略。

关键词: 有限单元法, 玻璃纤维/环氧树脂, 固化过程, 特征温度, 固化度

Abstract: In order to optimize the curing parameter, the mathematical model for the simulation of the temperature field of resin matrix prepreg during thermal curing process was developed based on the curing kinetics theory and finite element analysis method. The change characteristics of the temperature and curing degree of orthotropic composite during the curing process were numerically studied, and the correctness of the numerical model and methodology was verified by comparing the numerical results with the available experimental results. The effects of heating rate and glass fiber content on the curing characteristic temperatures and curing time of E208 epoxy resin matrix prepreg were studied. The results show that the exothermic peak of curing reaction move to high temperature, and the onset temperature and the final temperature of curing process also increase with increasing heating rate. Thus, it is concluded that the faster the heating rate, the higher temperature gradient and thermal stress occur in the prepreg, while the shorter time is need for completing curing. The results also indicate that the glass fiber leads to lower curing characteristic temperatures and later curing onset time, compared to the epoxy resin. However, the effect of the glass fiber on the curing final time can be ignored for the resin matrix prepreg.

Key words: finite element method, glass fiber/epoxy resin, curing process, characteristic temperature, curing degree

中图分类号:

TB332

陈淑仙, 田鹤, 李梦, 杨文锋. 环氧树脂基预浸料热固化特征温度和固化度研究[J]. 复合材料科学与工程, 2015, 0(2): 16-20.

CHEN Shu-xian, TIAN He, LI Meng, YANG Wen-feng. CHARACTERISTIC TEMPERATURE AND CURING DEGREE OF EPOXY RESIN MATRIX PREPREG DURING THERMAL CURING PROCESS[J]. COMPOSITES SCIENCE AND ENGINEERING, 2015, 0(2): 16-20.

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