基于因次分析方法的树脂基复合材料等温固化均匀性分析  

Analysis of isothermal curing uniformity of resin matrix composites based on dimensional analysis method

作　　者：贺继林[1] 王特[1] 潘若阳 马云荣[1] 

机构地区：[1]中南大学机电工程学院,长沙410083

出　　处：《复合材料学报》2016年第1期71-76,共6页Acta Materiae Compositae Sinica

基　　金："973"计划(2014CB046500)

摘　　要：在复合材料固化过程中,固化度场的非均匀性是引起残余热应力和固化收缩应力的重要因素。为了探讨树脂基复合材料结构件固化成型过程中的工艺参数对固化均匀性的影响,首先针对Epon 862/W环氧树脂体系建立了复合材料固化仿真模型,并对模型进行了验证;然后,通过因次分析得出了树脂基复合材料结构件的热传递方程和固化动力学方程的无因次形式;最后,通过数值模拟定量分析了固化工艺温度、对流换热系数和结构件厚度对复合材料固化均匀性的影响规律。结果表明:在等温固化条件下,对流换热系数对复合材料固化均匀性的影响很小,无因次式特征时间tc/树脂固化反应特征时间tR与固化度差值间存在拟合函数关系,该函数可以方便地用于工程计算。Non-uniformity of curing degree fields during curing process of composites is an important factor in cau sing residual thermal stress and curing shrinkage stress. In order to investigate the influences of process parameters on the curing uniformity during the curing molding process of resin matrix composite structures, a composite curing simulation model was built for Epon 862/W epoxy system firstly, and the model was verified. Then, the dimension- less form of heat transfer equation and curing kinetics equation about resin matrix composite structures was obtained by dimensional analysis. Finally, the influence rules of curing process temperature, convective heat transfer coeffi- cient and thickness of the structure on curing uniformity of the composites were quantitatively analyzed by numerical simulation. The results show that the convective heat transfer coefficient has little effect on curing uniformity of composites under the condition of isothermal curing. There is a fitting function relationship between the dimension- less group characteristic time to/characteristic resin curing reaction time tR and the difference of curing degree, and the function can be used in engineering calculation conveniently.

关 键 词：复合材料 固化均匀性 影响因素 因次分析 数据拟合 

分 类 号：TB332[一般工业技术—材料科学与工程]