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本文通过合并近年来报道的高聚物和颗粒物质的流体力学理论,提出了一个描述其混合物—粉末注射成形喂料宏观力学行为的新理论.与传统的喂料非牛顿流体力学相比,该理论多出了颗粒温度和两个弹性应变张量(分别表征高聚物和颗粒物组元)等状态变量,能全面描述喂料中出现的颗粒骨架和高聚物的弹性效应.对平面定常剪切流动情形,它简化为表观剪切黏度性质与喂料一致的非牛顿流体力学方程,表明新理论包含了传统喂料理论,因此可用于研究其适用前提,和包括法向应力差系数在内的流变学参数.本工作除有助于研究复杂多相系统连续力学方程的建立方法外,还将对粉末注射成形领域关注的喂料动力学分析提供一条新途径.
In this paper, we propose a new theory to describe the macroscopic mechanical behaviors of the mixture-powder injection molding feedstock by incorporating the fluid mechanics theory of polymer and particulate matter reported in recent years.Compared with the traditional feeding non-Newtonian fluid mechanics, The theory adds more state variables such as particle temperature and two elastic strain tensors (characterizing the polymer and particle components, respectively) and can fully describe the elastic effect of the particle skeleton and polymer in the feedstock. It is simplified to the non-Newtonian fluid mechanics equation that the apparent shear viscosity property is consistent with that of the feedstock. It shows that the new theory contains the traditional feedstock theory, so it can be used to study the applicable preconditions, including the normal stress difference coefficient Rheological parameters.In addition to helping to study the establishment of continuous mechanical equations for complex multiphase systems, this work will also provide a new approach to the feed dynamics analysis in the field of powder injection molding.