Three-dimensional simulation of shear-induced crystallization for polymers during injection molding process

ZHAO Peng; ZHAO Yao; YAN Bo; WANG Xiaoman; LU Shengkun; FU Jianzhong

doi:10.11949/j.issn.0438-1157.20170552

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Three-dimensional simulation of shear-induced crystallization for polymers during injection molding process

更新时间：2025-12-10

- Three-dimensional simulation of shear-induced crystallization for polymers during injection molding process
- CIESC Journal Issue 11, Pages: 4359-4366(2017)
- 作者机构：
  
  1. 浙江大学机械工程学院, 浙江省三维打印工艺与装备重点实验室,浙江,杭州,310027
  2. 上海交通大学材料科学与工程学院,上海,200030
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170552
  CLC： Q320
- Online First：05 November 2017，
  
  Published：05 November 2017
- 稿件说明：
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ZHAO Peng, ZHAO Yao, YAN Bo, et al. Three-dimensional simulation of shear-induced crystallization for polymers during injection molding process[J]. CIESC Journal, 2017, (11): 4359-4366.
DOI：

ZHAO Peng, ZHAO Yao, YAN Bo, et al. Three-dimensional simulation of shear-induced crystallization for polymers during injection molding process[J]. CIESC Journal, 2017, (11): 4359-4366. DOI： 10.11949/j.issn.0438-1157.20170552.

摘要

在考虑剪切导致分子链取向并升高其平衡熔点的基础上，建立了基于Nakamura方程的剪切诱导结晶动力学模型。在WLF-Cross黏度模型中引入结晶对黏度系数的影响，构建了考虑结晶的注射成型过程模型。采用改进的有限体积法对聚合物剪切诱导结晶行为进行了三维数值模拟，模拟中耦合了流动场、熔体压力、温度、诱导时间与结晶度。结果表明，本方法可清晰模拟出注射成型过程中聚合物的三维“喷泉”流动行为以及3层“皮-芯”结晶结构，同时，诱导结晶时间指数与相对结晶度的模拟结果与理论及实验结果吻合。

Abstract

Based on shear induces polymer orientation and increases its equilibrium melting temperature

a Nakamura equation based shear-induced crystallization kinetics model was presented. A model for injection molding simulation was also established

in which the influence of crystallization was considered into WLF-Cross viscosity coefficient. Three-dimensional shear-induced crystallization behavior was simulated by an improved finite volume method

which coupled flow field

melt pressure

temperature

induction time index and crystallinity. Experimental results show that the proposed method can clearly simulate the three-dimensional “fountain” flow behavior and the three-layer “skin-core” crystallization structure during injection molding process. The simulated shear-induction time index results and crystallinity results agree well with the theoretical and experimental results.

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