碳纤维增强聚苯硫醚复合材料激光加热原位成型过程中的温度场

Temperature field for laser heating of carbon fiber reinforced polyphenyl sulphide matrix composite in an automated fiber placement process

连续纤维增强热塑性复合材料(Thermoplastic Composite,TPC)自动铺放(Automated Fiber Placement,AFP)可以实现铺层原位成型,因此在制造大型结构件、降低加工成本及提升生产效率方面潜力巨大。原位成型过程中铺层温度场分布对复合材料构件成型质量具有较大影响,且激光加热过程中又涉及激光能量场与预浸料吸收光能后产生的温度场之间相互耦联,机理复杂,因此结合传热模型,通过有限元模拟仿真研究激光辅助加热自动铺放成型连续碳纤维增强聚苯硫醚(CF/PPS)复合材料过程中铺层经历的温度历程。同时构建铺层温度场测量系统,对铺层经历的温度历程进行实时采集和存储。研究结果表明,铺放过程中黏合区域前方存在激光辐照阴影区,使压辊下方黏合区域的温度急剧下降;随着铺放速度的增加,黏合区域峰值温度逐渐降低,且成型速度越快,铺层间黏合区域峰值温度差越小,而热电偶测量结果与仿真结果相差越大;随着激光输出功率的增大,铺层峰值温度逐渐升高;为提高原位成型效率,当激光输出功率选择最大6kW时,最大铺放速度为0.75m/s。通过对比,试验结果中的峰值温度与仿真模拟结果变化趋势相近,证明了有限元仿真模型的正确性。

The automated fiber placement(AFP)of continuous fiber reinforced thermoplastic composite(TPC)could realize the in-situ consolidation and offer the potential to manufacture large components,reduce cost and increase production rate.Desired quality of composite components depends intensively on the temperature field distribution,and the laser heating mechanism is very complicated because of the laser energy field is coupled with the temperature field generated by the absorption of laser,so the temperature history for laser heating of carbon fiber reinforced polyphenyl sulphide(CF/PPS)matrix composite in an automated fiber placement process was studied in the finite element simulation combined heat transfer model.Meanwhile,the temperature field measurement system was built to collect and memory the temperature history for layers.The study results show that a shadow zone is present prior to the bond zone and causes a rapid drop in temperature.The peak temperature of the bond zone gradually decreases belong with the increasing of placing speed and the faster the placement speed is,the smaller the peak temperature difference is and the bigger the difference between thermocouple and simulation is.With the increase of the laser output power,the peak temperature of the layers increases gradually.To improve the efficiency of the insitu consolidation,the maximum speed is 0.75 m/s when the laser output power is 6 kW.Because of the trend issimilar by comparing peak temperature of the experimental results and the simulated results,the finite element simulation results are correct.