聚合物颗粒形状和尺寸对其摩擦学性能的影响

V. Vytvytskyi, A. Y. Karvatskyi, I. Mikulionok, O. Sokolskyi
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摘要

以休止角形成问题为例,考虑聚合物颗粒的形状和尺寸对其摩擦学性能的影响,以离散元法为基础,将聚合物颗粒作为一组相对运动的颗粒在螺杆挤出机进料区工作通道内运动的数学模型进行了验证。本文研究了以下四种聚合物颗粒之间的相互作用:选用品牌为Marlex HHM 55020亿的高密度聚乙烯(HDPE)、品牌为11104-030的乙烯与醋酸乙烯共聚物(sevilene) (CEV)、品牌为Denka Styrol MW-1-301的聚苯乙烯(PS)、品牌为SorVyl G 2171/9005 11/01的聚氯乙烯(PVC),因为它们在工业上应用广泛,同时在形状、尺寸和物理机械特性上各不相同。采用Hertz-Mindlin粘弹性模型描述颗粒之间的相互作用,该模型假设球形颗粒在接触时不变形,并以预定的数量相互重叠,形成一个接触斑块。研究在EDEM软件包中进行。给出了自然方法和数值实验的休止角形成的计算结果,并分析了两种球团形状建模方法:在计算出的球团形状尽可能接近真实情况下,以球团形式和多球形式考虑球团形状。休止角形成的计算结果证明,与球形颗粒相比,采用更接近真实的颗粒形式时,基于离散元法的块体材料离散运动模型能更好地再现块体材料的运动行为。
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Research of the polymer granules shape and size influence on their tribological properties
The use of a mathematical model of discrete motion of bulk material were justified for movement of polymer granules in the working channel of feeding zone of the screw extruder as a set of particles moving relative to each other based on the Discrete Element Method taking into account the influence of the shape and the size of polymer granules on their tribological properties on the example of the problem of forming the angle of repose. The study of the interaction among the granules of the following four polymers has been conducted: high-density polyeth-ylene of brand Marlex HHM 5502BN (HDPE), copolymer of ethylene with vinyl acetate (sevilene) of brand 11104-030(CEV), polystyrene of brand Denka Styrol MW-1-301 (PS), polyvinyl chloride of brand SorVyl G 2171/9005 11/01 (PVC), which are selected because they are widely used in industry and at the same time differ from each other in shape, size and physical and mechanical characteristics. The Hertz-Mindlin viscoelastic model was used to de-scribe the interaction between granules, which assumes that the sphere-shaped particles do not deform upon con-tact and overlap each other by a predetermined amount, forming a contact patch. The study was carried out in the EDEM software package. The calculation results for the formation of an angle of repose of natural methods and numerical experiment were given with the two approaches to modeling the shape of pellets were analyzed: the consideration in the form of granules in the form of spheres and in the form of multisphere, when the calculated shape of the pellets as close to real. The results of the calculations on the formation of the angle of repose prove that the discrete motion model of bulk material based on the discrete element method when using the form of gran-ules close to real better reproduces the behavior of bulk materials compared to spherical granules.
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