Effects of gas-assisted extrusion on slip in the cable coating process

2021 ◽  
Vol 41 (4) ◽  
pp. 329-337
Author(s):  
Hongna Yin ◽  
Xingyuan Huang ◽  
Tongke Liu ◽  
Minjie Song
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Shear Stress ◽  
Production Efficiency ◽  
Flow Characteristics ◽  
Wall Slip ◽  
Extrusion Process ◽  
Core Wire ◽  
Extrudate Swell ◽  
Element Method

Abstract The isothermal viscoelastic finite element method is used to simulate and analyze the process of cable coating extrusion, in which the Navier slip model is adopted. The Phan–Thien–Tanner differential viscoelastic constitutive equation is used to describe the flow characteristics of the polymer melt. The polymer material used for simulation is polypropylene. The extrudate swell, velocity field, pressure field and shear stress field are calculated by finite element method. The influences of the gas-assisted extrusion and traditional extrusion on wall slip of cable coating extrusion are compared. The results indicate that the extrudate swell ratio is the largest under the condition of the complete slip between core wire and melt during traditional extrusion process. The increase of core wire dragging velocity can lead to the increase of slip velocity, the decrease of pressure and the increase of shear stress of melt. Gas-assisted extrusion can eliminate the negative effects caused by the slip of core wire or the increase of core wire dragging velocity. Therefore, gas-assisted extrusion can reduce the energy consumption, improve the cable coating layer quality and increase the production efficiency during extrusion process.

The Inverse Prediction for Profile Extrusion Die Based on the Finite Element Method

2014 ◽  
Vol 941-944 ◽  
pp. 2332-2335 ◽  
Author(s):  
Min Zhang ◽  
Chuan Zhen Huang ◽  
Yu Xi Jia ◽  
Jin Long Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Polymer Melt ◽  
Simulation Method ◽  
Extrusion Process ◽  
The Finite Element Method ◽  
Polymer Extrusion ◽  
Extrudate Swell ◽  
Extrusion Die ◽  
Element Method

Considering the extrudate swell, the polymer extrusion process was calculated by the inversed simulation based on the visco-elastic ecology theory. The fluid characteristics of the polymer melt were described by the Phan-Thien and Tanner (PTT) model. The Finite Element Method was used. Based on the simulation data, the extrusion die lips were analyzed. So it is feasible to design the polymer extrusion die lips using inversed simulation method.

Stress Solutions of some Axisymmetric and Non-Axisymmetric Cases with the Principles of Elasticity: A Review

2012 ◽  
Vol 215-216 ◽  
pp. 1026-1032
Author(s):  
Suhas Ankalkhope ◽  
Nilesh Jadhav ◽  
Sunil Bhat
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Shear Stress ◽  
Excellent Agreement ◽  
Stress Function ◽  
Structural Member ◽  
Numerical Results ◽  
Airy’S Stress Function ◽  
Element Method

Stress solutions are reviewed for some typical cases of axisymmetric and non-axisymmetric loads over a structural member with the principles of elasticity. A curved bar is chosen for the analysis. Tangential, radial and shear stress are determined analytically using Airy’s stress function. The curved bar is also modelled by finite element method to obtain numerical values of stress. Analytical and numerical results are in excellent agreement with each other.

Simulation of the Co-Extrusion of Hybrid Mg/Al Profiles

2009 ◽  
Vol 424 ◽  
pp. 113-119 ◽  
Author(s):  
Jerome Muehlhause ◽  
Sven Gall ◽  
Sören Müller
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Composite Materials ◽  
Material Flow ◽  
Extrusion Process ◽  
The Finite Element Method ◽  
Porthole Die ◽  
Single Production ◽  
Element Method

Extrusion of composite materials can offer big advantages. In this work the manufacturing of a hybrid metal profile in a single production step was investigated. A porthole die was used, thus producing profiles with extrusion seams. Along the seams a material mix up was visible. The extrusion process was simulated with the Finite Element Method to investigate the material flow in die and welding chamber in order to understand the cause for the defects at the seams.

scholarly journals Forming Analysis of Bulge Formed Joints Based on Adaptive Finite Element Method

Mechanika ◽  
2021 ◽  
Vol 27 (2) ◽  
pp. 175-181
Author(s):  
Jinjin ZHAI ◽  
Yuantao SUN ◽  
Qing ZHANG ◽  
Xianrong QIN
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Production Efficiency ◽  
Element Model ◽  
Large Error ◽  
Calculation Model ◽  
Adaptive Finite Element Method ◽  
Adaptive Finite Element ◽  
Forming Process ◽  
Element Method

Metal bulk forming is widely used because of its own advantages. In order to improve the production efficiency and reduce the cost, numerical simulation is often used to analyze the volume forming process. Because of the large deformation and non-linearity of the forming process, the finite element method (FEM) has the problem of element distortion, which will affect the accuracy and even lead to the failure of the analysis process. In this paper, an adaptive finite element method (AFEM) is proposed to solve this problem. Firstly, the finite element model is established, and grids are roughly divided. After the analysis, according to the error calculation model, the area with large error is determined by the standard deviation of nominal strain energy of nodes. Then, the grids are refined by dichotomy method, and the calculation is continued, repeating this step until the error meets the requirement. Finally, the numerical analysis of the forging process of the bulge formed joint is taken as an example to prove the accuracy of the proposed method.  

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