振动力场作用下PP/CaCO_3共混物的力学性能

Mechanical Property of PP/CaCO_3 Composite in Vibration Force Field

为研究新型动态三螺杆挤出成型技术对制品力学性能的影响,以PP/CaCO3共混物作为研究对象,在振动频率0～60Hz、振幅0～250μm的范围内对三螺杆挤出机施加振动,制成试样后进行拉伸强度、冲击强度测试和扫描电镜观察,研究不同振动参数对共混物力学性能及断面形态结构的影响.结果表明:制品的力学性能对振动参数的响应存在一个最佳值;与没有引入振动(稳态)的挤出相比,振动频率为20Hz、振幅为225μm时,共混物的冲击强度提高了21.7%;振动频率为20Hz、振幅为145μm时,共混物的拉伸强度提高了10.4%.

In order to investigate the effects of the novel dynamic three-screw extrusion moulding technology on the mechanical properties of the specimen, PP/CaCO3 composites were selected as the object to reveal the vibration parameters on the mechanical property and the section morphology structure. In the investigation, the vibration force with a frequency varying from 0 to 60 Hz and an amplitude varying from 0 to 250 μm was loaded on a three-screw ex- truder, and the tensile strength and the impact strength of the specimens were tested, followed by a SEM measurement. The results show that there exists an optimum point for the response of mechanical properties to vibration parameters, and that, as compared with the extrusion in the steady state, the composites show an increase in impact strength by 21.7% at a 20 Hz and 225 μm vibration, and an increase in tensile strength by 10. 4% at a 20Hz and 145 μm vibration.