剪切结晶对聚乙烯流变行为的影响

Q3 Engineering

International Journal of Nanomanufacturing Pub Date : 2019-01-08 DOI:10.1504/IJNM.2019.10018332

Wang Jin-yan, Chen Xingyu, Sun Min

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引用次数: 0

摘要

本文对剪切诱导结晶对流变行为的影响进行了数值模拟。流动对结晶的影响是通过剪切处理引起的额外核数与第一法向应力差之间的数学关系来考虑的。Avrami模型用于描述结晶动力学。随着结晶度的发展，模拟了归一化粘度、取向因子和额外应力。研究发现，短期剪切处理对聚乙烯的结晶动力学有很大影响，少量结晶会使剪切粘度大幅增加。超过特定的剪切应变，应力急剧增加，这表明材料固化和应力锁定。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Influence of shear-induced crystallisation on the rheological behaviour of polyethylene

This paper presents a numerical simulation for the influence of shear-induced crystallisation on the rheological behaviour. The effect of flow on crystallisation is considered through the mathematical relationship between the additional number of nuclei induced by shear treatment and the first normal stress difference. Avrami model is used to describe the crystallisation kinetics. Normalised viscosity, orientation factor and extra stress are simulated with the development of crystallinity. It is found that the short-term shear treatment has a great effect on the crystallisation dynamics of polyethylene, and a small amount of crystallinity cause a strong increase of shear viscosity. Beyond a specific shear strain the stress increases dramatically, which indicate the solidification of the material and the locking-in of stresses.

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来源期刊

International Journal of Nanomanufacturing Engineering-Industrial and Manufacturing Engineering

CiteScore

0.60

自引率

0.00%

发文量