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碳纤维增强塑料(CFRP)拉挤成型过程中固化度和温度变化为强耦合关系.通过差示扫描量热(DSC)实验计算得到模型所需的固化动力学参数,根据固化动力学和传热学理论建立了非稳态温度场与固化动力学数学模型,采用有限元与有限差分相结合的方法和ANSYS求解耦合场的间接耦合法对拉挤工艺不同工况下CFRP固化度进行数值模拟.采用特殊设计制作的铝毛细管封装的布拉格光栅光纤(FBG)传感器,屏蔽了荷载效应应变干扰,对CFRP温度场实时检测,从而计算得到实时固化度;同时采用索氏萃取实验测定CFRP制品固化度.结果表明,模拟与实验结果基本吻合.
The curing degree and temperature change during the CFRP pultrusion process are strongly coupled, and the curing kinetics parameters required by the model are calculated by DSC experiments. According to the curing kinetics and heat transfer theory The mathematical model of unsteady temperature field and solidification kinetics was set up and the CFRP curing degree under different working conditions was numerically simulated by finite element method combined with finite difference method and indirect coupling method of ANSYS. Specially designed Bragg grating fiber (FBG) sensor with aluminum capillaries was used to shield real-time CFRP temperature field from the strain effect of load, and the real-time curing degree was calculated. The curing degree of CFRP was also determined by Soxhlet extraction. Show that the simulation and experimental results are basically consistent.