树脂基复合材料制件微波固化数值模拟  

Numerical simulation of microwave curing of resin matrix composites workpiece

作　　者：龙习坤 李树健[1] 陈蓉[2] 曹正 李常平 常腾飞[1] LONG Xikun;LI Shujian;CHEN Rong;CAO Zheng;LI Changping;CHANG Tengfei(School of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;School of Mechanical Engineering,Hunan Institute of Engineering,Xiangtan 411104,China)

机构地区：[1]湖南科技大学机电工程学院,湘潭411201 [2]湖南工程学院机械工程学院,湘潭411104

出　　处：《复合材料学报》2023年第4期2415-2426,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51975208);湖南省自然科学基金(2020JJ4301)。

摘　　要：以T800碳纤维/X850环氧树脂复合材料T型制件为结合对象,利用COMSOL Multiphysics仿真软件,建立了反映复合材料制件单馈口谐振腔体微波固化的有限元仿真模型,研究了微波腔体和制件内部的电磁场、温度场、固化度场的分布规律及其与微波输入功率的映射关系。结果表明:在微波腔体内和制件内存在相反的电场强度分布,在复合材料制件内,远离微波馈入端口的区域的电场强度要高于近馈入端口区域,且在制件棱角区域,电场强度存在较强的尖端效应;随微波输入功率增加,微波腔体及制件内部的电场强度均随之增加,制件内电场强度最大值出现在上、下表面,且下表面温度明显较上表面高;提高微波输入功率会导致制件升温过快,进而诱发温度及固化度梯度。在升温中后期的制件厚度方向,温度和固化度梯度较明显。本文推荐微波输入功率应控制在500 W以内。Taking T800 carbon fiber/X850 epoxy composites T-shaped workpiece as the combined object,using COMSOL Multiphysics simulation software,the finite element simulation model reflecting the microwave curing of single feed resonant cavity of composites workpiece was established,and the distribution laws of electromagnetic field,temperature field and curing degree field inside the microwave cavity and workpiece and their mapping relationship with microwave input power were studied.The results show that there are opposite electric field intensity distributions in the microwave cavity and the workpiece.In the composite workpiece,the electric field intensity in the area far away from the microwave feed port is higher than that near the feed port,and there is a strong tip effect in the angular area of the workpiece;With the increase of microwave input power,the electric field intensity in the microwave cavity and the workpiece increases.The maximum electric field intensity appears on the upper and lower surfaces,and the temperature of the lower surface is significantly higher than that of the upper surface;Increasing the microwave input power will lead to the rapid temperature rise of the workpiece,and then induce the gradient of temperature and curing degree.In the middle and late stage of heating up,the gradient of temperature and curing degree is obvious.This study recommends that the microwave input power should be controlled within 500 W.

关 键 词：树脂基复合材料 微波固化 固化温度 固化度 数值模拟 

分 类 号：TQ327.3[化学工程—合成树脂塑料工业]