The Modelling of Orientation in Planar Polymer Welding Flows.

Abstract

Welding flows occur in many important polymer processing operations. When two streams of molten polymers meet and form a weld interface, the macromolecules near the interface can be highly oriented due to the flow history. Weld interfaces would vanish very quickly in a low molecular weight material. However, macromolecules need a long time to diffuse across the interface induced orientation on the welding process is largely unknown. This work establishes a mathematical model quantifying orientation development in two-dimensional welding flows of polymer liquids and tests the model experimentally. The modelling consists of three phases: 1. Determination of the approximate kinematics by using a finite element analysis. 2. Integration of the deformation history by tracking material elements based on continuum mechanics. 3. Calculation of the stress by using a memory integral constitutive equation. The modelling applies to molten homopolymers.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1987
Accession Number
ADA184404

Entities

People

  • James C. Chien
  • Kung-Hwa Wei

Organizations

  • University of Massachusetts Amherst

Tags

DTIC Thesaurus Topics

  • Constitutive Equations
  • Continuum Mechanics
  • Dielectric Polymers
  • Finite Element Analysis
  • Flow
  • Kinematics
  • Low Density
  • Macromolecules
  • Materials
  • Mathematical Models
  • Models
  • Molecular Weight
  • Orientation (Direction)
  • Polymers
  • Two Dimensional
  • United States
  • United States Government

Fields of Study

  • Materials science

Readers

  • Fluid Dynamics.
  • Materials Science (Mechanical Engineering).
  • Polymer Science and Technology