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Tp向高温方向移动,同时固化起始温度Ti和固化终止温度Tf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。
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.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2015年第2期16-20,共5页
Fiber Reinforced Plastics/Composites
基金
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)
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
finite element method
glass fiber /epoxy resin
curing process
characteristic temperature
curing degree
