超声塑化非晶聚合物颗粒界面摩擦生热的仿真研究

摘要

为分析超声塑化非晶聚合物颗粒的界面摩擦生热过程和超声塑化参数对界面摩擦生热速率的影响,利用LS-DYNA程序和Ansys仿真模拟了界面摩擦生热过程.结果表明,超声频率、超声振幅和塑化压力的增加可显著提高聚合物颗粒的界面摩擦生热速率,其中超声振幅对界面摩擦生热速率的影响更显著;当超声振幅为20μm,超声频率为30 kHz,塑化压力为0.8 kN时,在0.05278 s内聚合物局部温度升高到224.5℃,生热速率达到3874.5℃/s,得到界面摩擦生热是瞬态过程.%In order to analyze the interfacial friction heat generation process of ultrasonically plasticized polymer particles and effect of ultrasonic plasticization parameters on interfacial friction heat generation rate,both LS-DYNA and Ansys software were used to simulate the interfacial friction heat generation process.The results indicated that the increase of ultrasonic frequency,ultrasonic amplitude and plasticized pressure can significantly improve the interfacial friction heat generation rate of polymer particles,but the effect of ultrasonic amplitude on the interfacial friction heat generation rate was more significant.When the processing conditions were set to an ultrasonic amplitude of 20 μm,an ultrasonic frequency of 30 kHz and a plasticized pressure of 0.8 kN,the local temperature of the polymer was improved to 224.5 ℃ at 0.05278 seconds and the heat generation rate reached 3874.5 ℃/s.In this case,the friction heat generation was considered as a transient process.