【摘要】 以振动场中流经毛细管的聚合物熔体为研究对象,针对忽略和不忽略惯性力项对熔体弹性行为的影响 2 种情况,分别推导出振动力场中毛细管壁处聚合物熔体第一法向应力差的计算公式。研究结果表明:不忽略惯性力项影响时,所建立的计算公式与毛细管几何尺寸、毛细管体积流量脉动、毛细管压力降脉动、应力应变相位差以及聚合物材料特性等有关,从而使相同振动力场中毛细管壁处聚合物熔体第一法向应力差的计算结果比忽略惯性力项的结果小;不忽略惯性力项影响所得到的计算结果能更客观地反映振动力场中聚合物熔体的非线性弹性行为。更多还原

【Abstract】 The process of polymer melt dynamically extruding through capillary under the vibration force field was analyzed theoretically. The characterization equations of primary normal stress difference of polymer melt were derived with or without the consideration of the inertia item respectively. Equation with consideration of the inertia item has relation to capillary geometrical parameters, capillary pulsant volume flow rate, capillary pulsant pressure drop, phase difference and material characters, which causes the calculated result to be smaller than that without consideration of the inertia item. It can be concluded that the calculation results with consideration of the inertia item are more reasonable.更多还原