预浸带铺放过程温度场动态仿真与实验研究

Dynamic finite element simulation and experimental study on heat transfer in prepreg placement process

为了测量铺放过程中粘合点温度峰值和复合材料的温度场分布,构建了基于Lab VIEW的温度场在线测量系统。实验中预浸带铺放5层,热风枪稳定温度为200℃。实验结果表明,随着铺放过程的进行,每一层预浸带的温度曲线都出现多个峰值,且峰值逐渐降低,其中第1个峰值即为粘合点温度,平均分别为80.1、91.4、101.3、113、108.3℃,比较可知,各层预浸带粘合点温度逐渐升高。同时,建立了预浸带铺放温度场有限元模型,利用ANSYS中的生死单元以及循环加载技术模拟了预浸带动态铺放过程。有限元模拟结果中的粘合点温度分别为71.8、96.2、104.3、107.9、105.3℃,与实验结果相比误差可控制在10%以内,且粘合点温度越高,其准确性越好。

An online temperature measurement system based on LabVIEW was established,aiming at measuring the temperature peak at the nip-point and the temperature distribution in the prepreg placement process.In the experiment,5 layers of prepreg were laid-up and the stable temperature of hot air was 200℃.The experimental results show that along with the placement process,the temperature curves of every layer have several peaks decreasing gradually and the first peak was the nip-point temperature.The nip-point temperatures of each layer increased gradually,which were 80.1℃,91.4℃,101.3℃,113℃ and 108.3℃ respectively.In addition,a finite element model of temperature field was established and a dynamic finite element simulation for prepreg placement process was done by using the birth-death element strategy and the cyclic loading strategy in ANSYS.The nip-point temperatures in the finite element simulation results were 71.8℃,96.2℃,104.3℃,107.9℃ and 105.3℃ respectively.The error of the nip-point temperature between finite element simulation results and experimental results can be controlled within 10%,and the higher the nippoint temperature get,the more accurate the result become.