Numerical Studies for the Effects of Viscoelastic Constitutive Parameters on the Extrudate Swell of Plastic Micro-Tubes

Zhong Ren; Xing Yuan Huang; Zhi Hua Xiong

doi:10.4028/www.scientific.net/MSF.932.19

Paper Titles

Preface

Deformation Characteristics of the Sheet Metal in the Roll Gap for the Continuous Roll Forming Process
p.3

Influence of Process Parameters on Surface Roughness and Wettability of Aluminum-Matrix Materials
p.8

Experimental Research on Hydrogen Resistance Performance of Different Microstructure
p.13

Numerical Studies for the Effects of Viscoelastic Constitutive Parameters on the Extrudate Swell of Plastic Micro-Tubes
p.19

Plasma Simulation for the Anode Layer Ionization Source Using in the Material Modification Process
p.24

Study on the Material Removal Rate of Nano-ZrO₂ Ceramics under Ultrasonic Vibration Assisted Diamond Fly-Cutting
p.30

The Effect of Lattice Orientation on the Film Hole Deformation of Nickel-Based Single Crystal Plate Specimen
p.39

Mechanical Properties Evaluation Method on Welded Joints of X70 Pipeline Steel Based on Vickers Hardness and Indentation Test
p.44

HomeMaterials Science ForumMaterials Science Forum Vol. 932Numerical Studies for the Effects of Viscoelastic...

Numerical Studies for the Effects of Viscoelastic Constitutive Parameters on the Extrudate Swell of Plastic Micro-Tubes

Abstract:

The effects of four difference viscoelastic constitutive parameters, i.e., viscosity, relaxation time, ε and ξ on the extrudate swell of plastic micro-tubes were studied by using the numerical method. Numerical results show that the extrudate swell of plastic micro-tube increases with the increase of the relaxation time, but decreases with the increase of ε and ξ. In addition, the extrudate swell ratio of plastic micro-tube is not changed with the increase of the viscosity of melt. To ascertain the effect of four different viscoelastic constitutive parameters on the extrudate swell of plastic micro-tube, the physical field distributions, i.e., flow velocity, shear rate, shear stress, and first normal stress difference distributions of melt were obtained, respectively. Results show that the extrudate swell phenomenon of plastic micro-tube is closely dependent on the elastic energy storage of melt induced by the above mentioned physical field distributions, especially at the outlet of die.