文章摘要
黏弹性热流固耦合作用诱导聚合物变形的机理
Mechanism of Viscoelastic Thermal Fluid Structure Coupling Effect Induced Polymer Deformation
  
DOI:10.16865/j.cnki.1000-7555.2018.07.015
中文关键词: 变形  模内微装配成型  热流固耦合  微型机械  黏弹性
英文关键词: deformation  in-mold micro assembly molding  thermal-fluid-structure coupling  micro-machines  viscoelasticity
基金项目:国家自然科学基金资助项目(21464009)
作者单位
周国发,邓其春,江先念,段治锋,李斐斐 南昌大学 资源环境与化工学院,江西 南昌 330031 
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中文摘要:
      模内微装配成型有望成为高效低成本产业化聚合物微型机械制造技术,而如何准确预测和精密控制其二次成型过程的黏弹性热流固耦合变形仍是其工业化的技术瓶颈。基于考虑微装配界面周围高温黏弹性熔体流动环境边界约束作用,建立了描述模内微装配成型黏弹性热流固耦合作用诱导聚合物变形的理论模型。研究表明,黏弹性与纯黏性熔体热流固耦合的本质区别在于熔体的弹性特性能有效抑制微装配界面的热流固耦合作用,使得预成型微型轴的变形和装配界面的热流固耦合载荷均随二次成型熔体松弛时间的延长而减小,且其变形受控于微装配界面所承受的黏弹性热流固耦合压力、黏弹性支撑正应力和黏性拖曳剪切应力,选用高弹性二次成型熔体有利于抑制黏弹性热流固耦合变形,可提高微装配加工精度。
英文摘要:
      In-mold assembly molding technology is expected to become cost-effective industrial polymer micro mechanical manufacturing technologies, but how to predict accurately and precisely control the viscoelastic thermal-fluid-structure coupling deformation is still the technical bottleneck of industrialization. The theoretical model describing viscoelastic thermal-fluid-structure coupling effect induced polymer deformation was established in in-mold micro assembly molding process based on the boundary restraining influence of the surrounding secondary molding high temperature viscoelastic melt on the micro assembly interface of permolded micro shaft. Research results show that the essential difference between thermal-fluid-structure coupling effect between viscoelastic melt and pure viscous melt is that the elastic properties of secondary molding melt can effectively restrain the thermal-fluid-structure coupling effect on micro assembly interface, which make permolded micro shaft deformation and the micro assembly interfacial thermal-fluid-structure coupling load will reduce with increasing of secondary molding melt relaxation time,and viscoelastic thermal-fluid-structure coupling deformation is controlled by the coupling pressure, viscoelastic support normal stress, viscous friction drag shear stress on the micro assembly interface. It is beneficial to restrain the viscoelastic thermal-fluid-structure coupling deformation, and to improve the molding accuracy of micro assembly by choosing large relaxation time polymeric material for secondary molding micro component.
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