关键词: 超声塑化, 界面摩擦生热速率, 塑化参数, 仿真模拟

Abstract: 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.

Key words: ultrasonic plasticization, interfacial friction heat generation rate, ultrasonic plasticization parameter, simulation