预浸带铺放过程温度场动态仿真与实验研究

摘要

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 addi⁃tion,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 nip⁃point temperature get,the more accurate the result become.%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LabVIEW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。