基于有限体积法的三维注塑结晶过程模拟.doc

文档介绍：
基于有限体积法的三维注塑结晶过程模拟#
严波1,李阳2,赵朋3**
(1. 上海交通大学材料科学与工程学院,上海 200030;
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2. 华中科技大学材料科学与工程学院,武汉 430074;
3. 浙江大学流体动力与机电系统国家重点实验室,杭州 310027)
摘要:半结晶型塑料的注塑熔体流变行为改变了结晶形态的演化规律,基于剪切应力引起分
子链取向并导致平衡熔点升高,建立了非等温剪切诱导结晶动力学模型。考虑结晶对塑料熔
体粘度的影响以及结晶潜热改变了注塑的冷却过程,采用改进有限体积法对注塑充模、冷却
阶段中的结晶过程进行了三维数值模拟,模拟中耦合了熔体流动速度、压力、温度场与相对
结晶度。不同成形工艺条件下的数值算例表明,充模过程中由于注射时间较短,熔体温度较
高,塑料结晶量很小,可以忽略不计;工艺条件决定最终制品的结晶分布,可以通过改变工
艺条件获得所需要的结晶形态分布。
关键词:注塑;剪切诱导;结晶动力学;结晶形态;改进有限体积法
中图分类号:
Three Dimensional Numerical Simulation of Crystallization
of Plastic Injection Molding Based on Finite Volume Method
YAN Bo1, LI Yang2, ZHAO Peng3
(1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai
200030;
2. School of Materials Science and Eingeering, Huazhong University of Science and Technology,
Wuhan 430074;
3. The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou
310027)
Abstract: Crystallization evolution changes with the rheology of semicrystalline plastic melt
during injection molding. The non-isothermal shear stress-induced crystallization ics models
are proposed based on the hypothesis that shear stress induced orientation of polymer chains
increases the equilibrium melting temperature. Considering the effect of crystallization on melt
viscosity and latent heat on cooling stage, the improved 3D finite volu