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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。
In the curing process of composite materials, the heterogeneity of the curing degree field is an important factor that causes residual thermal stress and curing shrinkage stress. In order to investigate the influence of process parameters on the curing uniformity during the curing process of resin-based composite structures, a simulation model of composite materials was established for Epon 862 / W epoxy resin system and the model was verified. Then, The heat transfer equation and the non-dimensional form of the curing kinetics equation of the resin-based composite structure were obtained through the analysis of the results. Finally, the effects of the curing temperature, the convective heat transfer coefficient and the thickness of the structure on the mechanical properties of the composite Effect of curing uniformity. The results show that the convective heat transfer coefficient has little effect on the curing uniformity of the composites under isothermal curing conditions. There is a fitting function between the characteristic time tc / resin curing reaction time tR and the difference of curing degrees, This function can be easily used for engineering calculations.