热固性复合材料固化过程中温度场的三维有限元分析

根据热传导和固化动力学理论, 采用三维有限元方法, 对正交各向异性复合材料层合板固化过程的温度和固化度历程及其变化规律进行数值模拟研究。在有限元分析中节点自由度为温度和固化度, 考虑了两者之间的耦合作用。计算结果表明: 厚度越大, 温度峰值越高, 中心点开始固化越晚; 不同纤维体积含量层合板在固化初期是同步的; 中心点温度超过保温平台(85 ℃) 后, 随着环境温度继续升高, 纤维体积含量越低, 中心点温度峰值越大, 出现时间越早。 

Three-dimensional f inite element analysis for the temperaturef ield of thermoset composites during cure process

Based on the thermal conduct theory and cure kinetics , the history of cure temperature and degree ofcure was investigated for the orthot ropic laminate during curing. The temperature and degree of cure were chosen astwo additional degrees of nodes in FEM models , and the coupling of them was taken into account . The result showsthat : for the thick laminate , the peak value of the temperature was increased , and the initiation of the crosslinkingreaction at the center point was late ; for the laminates with different fiber content s , the development of the degree ofcure is synchronic at the early stage of the curing process , when the temperature is higher than that of the dwell(85 ℃) , the lower the fiber content in the laminates , the higher the peak value of temperature at the center of thelaminates , and it s corresponding time is quicker.